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date_timezone_set

Last updated: Mon, 05 Feb 2007

date

(PHP 4, PHP 5)

date — ローカルの日付/時刻を書式化する

説明

string date ( string format [, int timestamp] )

指定された引数 timestamp を、与えられたフォーマット文字列によりフォーマットし、日付文字列を返します。タイムスタンプが与えられない場合は、現在の時刻が使われます。つまり timestamp はオプションでありそのデフォルト値は time() の値です。

パラメータ

format

出力される日付文字列の書式。以下のオプションを参照ください。

表 42. 以下の文字が format パラメータ文字列として認識されます

`format` 文字	説明	戻り値の例
日	---	---
`d`	日。二桁の数字（先頭にゼロがつく場合も）	`01` から `31`
`D`	曜日。3文字のテキスト形式。	`Mon` から `Sun`
`j`	日。先頭にゼロをつけない。	`1` から `31`
`l` (lowercase 'L')	曜日。フルスペル形式。	`Sunday` から `Saturday`
`N`	ISO-8601 形式の、曜日の数値表現 (PHP 5.1.0 で追加)。	`1`（月曜日）から `7`（日曜日）
`S`	英語形式の序数を表すサフィックス。2 文字。	`st`, `nd`, `rd` または `th`。 `j`と一緒に使用することができる。
`w`	曜日。数値。	`0` (日曜)から `6` (土曜)
`z`	年間の通算日。数字。(ゼロから開始)	`0` から `365`
週	---	---
`W`	ISO-8601 月曜日に始まる年単位の週番号 (PHP 4.1.0 で追加)	例: `42` (年の第 42 週目)
月	---	---
`F`	月。フルスペルの文字。	`January` から `December`
`m`	月。数字。先頭にゼロをつける。	`01` から `12`
`M`	月。3 文字形式。	`Jan` から `Dec`
`n`	月。数字。先頭にゼロをつけない。	`1` から `12`
`t`	指定した月の日数。	`28` から `31`
年	---	---
`L`	閏年であるかどうか。	`1`なら閏年。`0`なら閏年ではない。
`o`	ISO-8601 形式の年。これは `Y` ほぼ同じだが、ISO 週番号（`W`）が前年あるいは翌年に属する場合がある点で異なる（PHP 5.1.0 で追加）。	例: `1999` あるいは `2003`
`Y`	年。4 桁の数字。	例: `1999`または`2003`
`y`	年。2 桁の数字。	例: `99` または `03`
時	---	---
`a`	午前または午後（小文字）	`am` または `pm`
`A`	午前または午後（大文字）	`AM` または `PM`
`B`	Swatch インターネット時間	`000` から `999`
`g`	時。12時間単位。先頭にゼロを付けない。	`1` から `12`
`G`	時。24時間単位。先頭にゼロを付けない。	`0` から `23`
`h`	時。数字。12 時間単位。	`01` から `12`
`H`	時。数字。24 時間単位。	`00` から `23`
`i`	分。先頭にゼロをつける。	`00` to `59`
`s`	秒。先頭にゼロをつける。	`00` から `59`
タイムゾーン	---	---
`e`	タイムゾーン識別子（PHP 5.1.0 で追加）	例: `UTC`, `GMT`, `Atlantic/Azores`
`I` (capital i)	サマータイム中か否か	`1`ならサマータイム中。 `0`ならそうではない。
`O`	グリニッジ標準時 (GMT) との時差	例: `+0200`
`P`	グリニッジ標準時 (GMT) との時差。時間と分をコロンで区切った形式 (PHP 5.1.3 で追加)。	例: `+02:00`
`T`	タイムゾーンの略称	例: `EST`, `MDT` ...
`Z`	タイムゾーンのオフセット秒数。 UTC の西側のタイムゾーン用のオフセットは常に負です。そして、 UTC の東側のオフセットは常に正です。	`-43200` から `50400`
全ての日付/時刻	---	---
`c`	ISO 8601 日付 (PHP 5 で追加されました)	2004-02-12T15:19:21+00:00
`r`	» RFC 2822 フォーマットされた日付	例: `Thu, 21 Dec 2000 16:01:07 +0200`
`U`	Unix Epoch (1970 年 1 月 1 日 0 時 0 分 0 秒) からの秒数	time() も参照

フォーマット文字列中の認識されない文字は、そのまま表示されます。 Z 形式は、 gmdate() で使用した場合、常に 0 を返します。

timestamp

オプションのパラメータ timestamp は、 integer 型の Unix タイムスタンプです。 timestamp が指定されなかった場合のデフォルト値は、現在の時刻です。言い換えると、デフォルトは time() の返り値となります。

返り値

日付を表す文字列を返します。 timestamp に数字以外が使用された場合は FALSE が返され、E_WARNING レベルのエラーが発生します。

エラー / 例外

すべての日付/時刻関数は、有効なタイムゾーンが設定されていない場合に E_NOTICE を発生させます。また、システム設定のタイムゾーンあるいは環境変数 TZ を使用した場合には E_STRICT を発生させます。 date_default_timezone_set() も参照ください。

変更履歴

バージョン	説明
5.1.0	有効なタイムスタンプの範囲は、通常 Fri, 13 Dec 1901 20:45:54 GMT から Tue, 19 Jan 2038 03:14:07 GMT までです (これらの日付は、32 ビット符号付き整数の最小および最大値に対応します)。しかし、PHP 5.1 より前のバージョンでは、システム環境によっては (例: Windows) この範囲が 1970 年 1 月 1 日から 2038 年 1 月 19 日までに制限されます。
5.1.0	タイムゾーンがおかしい場合に `E_STRICT` や `E_NOTICE` が発生するようになりました。
5.1.1	PHP 5.1.1 以降、`format` パラメータで標準的な日付/時刻フォーマットを指定する際に有用な定数がいくつか追加されました。

例

例 415. date() の例


<?php

// 使用するデフォルトのタイムゾーンを指定します。PHP 5.1 以降で使用可能です。

date_default_timezone_set('UTC');





// 結果は、たとえば Monday のようになります。

echo date("l");



// 結果は、たとえば Monday 15th of August 2005 03:12:46 PM のようになります。

echo date('l dS \of F Y h:i:s A');



// 結果は July 1, 2000 is on a Saturday となります。

echo "July 1, 2000 is on a " . date("l", mktime(0, 0, 0, 7, 1, 2000));



/* 書式指定パラメータに、定数を使用します。 */

// 結果は、たとえば Mon, 15 Aug 2005 15:12:46 UTC のようになります。

echo date(DATE_RFC822);



// 結果は、たとえば 2000-07-01T00:00:00+00:00 のようになります。

echo date(DATE_ATOM, mktime(0, 0, 0, 7, 1, 2000));

?>

前にバックスラッシュを付けてエスケープすることにより、フォーマット文字列として認識される文字が展開されることを防止することができます。バックスラッシュ付きの文字は既に特別なシーケンスであり、バックスラッシュもエスケープすることが必要となる可能性があります。

例 416. date() の文字をエスケープする


<?php

// Wednesday the 15th のように出力

echo date("l \\t\h\e jS");

?>

date() と mktime() の両方を用いて、未来または過去の日付を知ることができます。

例 417. date() と mktime() の例


<?php

$tomorrow  = mktime(0, 0, 0, date("m")  , date("d")+1, date("Y"));

$lastmonth = mktime(0, 0, 0, date("m")-1, date("d"),   date("Y"));

$nextyear  = mktime(0, 0, 0, date("m"),   date("d"),   date("Y")+1);

?>

注意: サマータイムがあるため、日付や月の秒数を単純にタイムスタンプに可減算するよりもより信頼性があります。

date() フォーマットのいくつかの例を示します。現在の実装で特別な意味がある文字や今後の PHP のバージョンで意味が割り付けられるであろう文字については、望ましくない結果を避けるためにエスケープする必要があることに注意してください。エスケープをする際には、改行文字 \n のような文字を回避するためにシングルクォートを使用してください。

例 418. date() のフォーマット指定


<?php

// 今日は March 10th, 2001, 5:16:18 pm であるとします。



$today = date("F j, Y, g:i a");                 // March 10, 2001, 5:16 pm

$today = date("m.d.y");                         // 03.10.01

$today = date("j, n, Y");                       // 10, 3, 2001

$today = date("Ymd");                           // 20010310

$today = date('h-i-s, j-m-y, it is w Day z ');  // 05-16-17, 10-03-01, 1631 1618 6 Fripm01

$today = date('\i\t \i\s \t\h\e jS \d\a\y.');   // It is the 10th day.

$today = date("D M j G:i:s T Y");               // Sat Mar 10 15:16:08 MST 2001

$today = date('H:m:s \m \i\s\ \m\o\n\t\h');     // 17:03:17 m is month

$today = date("H:i:s");                         // 17:16:17

?>

他の言語で日付をフォーマットするためには、date() のかわりに setlocale() および strftime() 関数を使用する必要があります。

注意

注意: 日付の文字列表現からタイムスタンプを生成するには、 strtotime() が使用できるでしょう。さらに、いくつかのデータベースは（MySQL の » UNIX_TIMESTAMP 関数のような）日付フォーマットからタイムスタンプへの変換関数を有しています。

ティップ

PHP 5.1 以降、$_SERVER['REQUEST_TIME'] によってリクエスト開始時のタイムスタンプが取得できるようになりました。

参考

getlastmod()
gmdate()
mktime()
strftime()
time()

add a note User Contributed Notes
date

dmitrid at dont_show dot com
11-Mar-2007 05:14


Note for wips week limits function:

I had to run it over 52 weeks of the year and it was very slow so I've modified to improve:

function week_limits($weekNumber, $year, $pattern)

{

    $pattern = ($pattern) ? $pattern : "m/d";

    $stday = 7 * $weekNumber - 7;

    $stDayNumber = date("w", mktime(0,0,0,1, 1+$stday, $year));

    $stUtime = mktime(0,0,0,1,1+$stday-$stDayNumber, $year);

    $start_time = date($pattern, $stUtime);

    $end_time = date($pattern, $stUtime+6*24*60*60);

   return array($start_time, $end_time);

}//week_limits()

wips at mail dot ru
16-Feb-2007 12:04


/**

         * Defines week limits. 

         * Week numbers in [1..54]. First week is from 1st of Jan till first Sunday in year, last week is from last monday

         * in year till 31st of Dec.

         *

         * @param  int $weekNumber  -   Week number

         * @param  int $year        -   Year

         * @return array            -   array($start_time, $end_time). $start_time - begin of week, $end_time - end of week in Unix timestamp. 

         *                              Precition is +-24 hours.

         */

        function week_limits($weekNumber, $year)

        {

            // begin datetime

            $time = mktime(1, 1, 1, 1, 1, $year);            

            // Aassuring that $weekNumber is number

            $weekNumber--;

            // If first week of year starts not from monday, date() will return "not correct" result (in this case first week is 0)

            if (date('w', $time) == 1)

                $weekNumber++;

            $start_time = false;

            $end_time = false;

            for ($day = 1; $day <= 380; $day++)

            {

                if (date('W', $time) == $weekNumber && !$start_time)

                    $start_time = $time;

                if (date('W', $time - 24*60*60) == $weekNumber && !$end_time && date('W', $time) != $weekNumber)

                    $end_time = $time - 24*60*60;               

                if ($start_time && $end_time)

                    break;     

                $time += 24*60*60;

            }

            return array($start_time, $end_time);

        }//week_limits()

dragon at alimex dot biz
15-Feb-2007 05:30


The function posted by mybenchmarkid down is great, but I would suggest a slight change.

The "$days" line should be without the "+1" at the end:



$days = (strtotime($endDate) - strtotime($startDate)) / 86400;



and the "for" line should be with "<=" instead of "<":



for($i=0; $i<=$days; $i++)



This way you can use a specific endDate or just use today:



$days = (time() - strtotime($startDate)) / 86400;



It will work both ways.



Bobby

mybenchmarkid at yahoo dot com
14-Feb-2007 03:55


here is a function I wrote that was useful for a calendar application I was using.  



It returns an array of the valid dates between two parameter dates.  enjoy.



<?

function DatesBetween($startDate, $endDate){

    // get the number of days between the two given dates.

    $days = (strtotime($endDate) - strtotime($startDate)) / 86400 + 1;

    $startMonth = date("m", strtotime($startDate));

    $startDay = date("d", strtotime($startDate));

    $startYear = date("Y", strtotime($startDate));    

    $dates;//the array of dates to be passed back

    for($i=0; $i<$days; $i++){

        $dates[$i] = date("n/j/Y", mktime(0, 0, 0, $startMonth , ($startDay+$i), $startYear));

    }

    return $dates;    

}



?>

example: $dates = DatesBetween("2/27/2007","3/3/2007")



Array ( [0] => 2/27/2007 [1] => 2/28/2007 [2] => 3/1/2007 [3] => 3/2/2007 [4] => 3/3/2007 )

rodflash.com
09-Feb-2007 12:24


To make date comparison, don't use date() function. Use strtotime



//Check earlier date

$date=strtotime("$month/$day/$year");

$today=strtotime("now");



if ($date> $today) { 

    //Early date

} else { 

    //Old date

}



You can also put another input formats:

http://www.gnu.org/software/tar/manual/html_node/tar_109.html

Eamon Straughn eamon at gizzle dot co dot uk
06-Feb-2007 06:33


Check this out this is a class i made last year for Gizzle.co.uk but sinced used on other projects and is quite a treat. It checks for a absolute valid date or datetime type. returns booleen. Disclaimer I do not take responsibility for the use of this class. I guarantees it works.



<?php

#Created By Eamon Straughn, Class extends Date() informally

class isDate

{

    private $arg;

    private $return = false;

    private $stack;

    private $stacks;

    private $pos = array();

    private $poss = array();

    

    public function __construct($arg)

    {

        $this->arg = trim($arg);

    }

    

    private function DateType()

    {

        //if length is more than 10 then it is not a date

        if(($n = strlen($this->arg)) > 10)

        return false;

        

        //if length is less than 6 then it is not a date

        elseif($n < 6)

        return false;

        

        //get values into arrays for processing

        for($i = 0; $i < $n; $i ++)

        { 

            if(is_numeric($this->arg[$i]))

            $this->stack .= (isset($this->arg[$i])) ? $this->arg[$i] : null;

            elseif(($this->arg[$i] == "-") || ($this->arg[$i] == "/") || ($this->arg[$i] == "\\"))

            $this->pos[$i] = (isset($i)) ? $i : null;        

        }

            

        //strip values to be checked

        if(is_numeric($c = substr($this->stack, 0, current($this->pos))))

        $d = (strlen($c) > 2) ? substr($this->stack, current($this->pos), current($this->pos)/2) : substr($this->stack, current($this->pos), current($this->pos));

        else

        return false;

        if(is_numeric($d)) 

        if(is_numeric($e = substr($this->stack, end($this->pos)-1, end($this->pos)-1)));

        

        //convert string to integer

        $c = (int) $c;

        $d = (int) $d;

        $e = (int) $e;

        

        //check if it is a valid date

        if((checkdate($d,$c,$e)) || (checkdate($d,$e,$c)))

        return true;

        

        return false;

        

    }

    

    private function DateTimeType()

    {

        //if length is more than 10 then it is not a datetime

        if(($n = strlen($this->arg)) < 10)

        return false;

        

        //if length is less than 19 then it is not a datetime

        elseif($n < 19)

        return false;

        

        //get values into arrays for processing

        for($i = 0; $i < $n; $i ++)

        { 

            if(is_numeric($this->arg[$i]))

            $this->stacks .= (isset($this->arg[$i])) ? $this->arg[$i] : null;

            elseif(($this->arg[$i] == "-") || ($this->arg[$i] == "/") || ($this->arg[$i] == "\\") || ($this->arg[$i] == " ") || ($this->arg[$i] == ":"))

            $this->poss[$i] = (isset($i)) ? $i : null;        

        }

        

        //strip values to be checked

        if(is_numeric($c = substr($this->stacks, 0, current($this->poss))))

        $d = (strlen($c) > 2) ? substr($this->stacks, current($this->poss), current($this->poss)/2) : substr($this->stacks, current($this->poss), current($this->poss));

        else

        return false;

        

        if(is_numeric($d))

        $e = (strlen($c) > 2) ? substr($this->stacks, next($this->poss)-1, (next($this->poss)-1)/4) : substr($this->stacks, next($this->poss)-1, (next($this->poss)-1)/2);

        if(is_numeric($e))

        if(is_numeric($f = substr($this->stacks, (next($this->poss)/2)+2, 2)));

        if(is_numeric($g = substr($this->stacks, (next($this->poss)/2)+2, 2)));

        if(is_numeric($h = substr($this->stacks, (end($this->poss)/2)+4, 2)));

        

        //convert string to integer

        $c = (int) $c;

        $d = (int) $d;

        $e = (int) $e;

        $f = (int) $f;

        $g = (int) $g;

        $h = (int) $h;

        

        //check if the time is valid

        if($f > 24)

        return false;

        if($g > 60)

        return false;

        if($h > 60)

        return false;



        //check if it is a valid date

        if((checkdate($d,$c,$e)) || (checkdate($d,$e,$c)))

        return true;

        

        return false;

        

    }

    

    public function DateCheck()

    {

        if($this->DateTimeType())

        $this->return = true;

        elseif($this->DateType())

        $this->return = true;

        else

        $this->return = false;

        

        return $this->return;        

    }

}

?>

example of use

<?php

//assign a date

$d = "2006-12-12 10:15:00"; $t = "12-12-2006"; $f = "1-1-2001 10:23:09";

//the above can be used regardless if it is shortdate or long date but remember the year must always be 4 integers.



$c = new isDate($d);

if($c->CheckDate() !== false) echo $d;

?>

if anyone wants to extend it to check time and posibly do more feel free to.



Eamon..

cj at 407x dot com
06-Feb-2007 04:43


This is a very simple few lines of code to display dates that arrive in various formats:



$dateArray=explode('-','2007-02-05');



// $dateArray[0]= 2007

// $dateArray[1] = 02

// $dateArray[2] = 05



echo date('M j, Y', mktime(0, 0, 0, $dateArray[1], $dateArray[2], $dateArray[0])); 



// result: Feb 2, 2007



alter your explode characters and dateArray positions to suit.



Chris

marius at svr dot ro
06-Feb-2007 03:54


Re: steve at somejunkwelike dot com



I think this is a better function to find the business days between two dates. This function requires PHP 5.1.0.



<?php

//The function returns the no. of business days between two dates and it skeeps the holidays

function getWorkingDays($startDate,$endDate,$holidays){

    //The total number of days between the two dates. We compute the no. of seconds and divide it to 60*60*24

    //We add one to inlude both dates in the interval.

    $days = (strtotime($endDate) - strtotime($startDate)) / 86400 + 1;



    $no_full_weeks = floor($days / 7);

    $no_remaining_days = fmod($days, 7);



    //It will return 1 if it's Monday,.. ,7 for Sunday

    $the_first_day_of_week = date("N",strtotime($startDate));

    $the_last_day_of_week = date("N",strtotime($endDate));



    //The two can't be equal because the $no_remaining_days (the interval between $the_first_day_of_week and $the_last_day_of_week) is at most 6

    //In the first case the whole interval is within a week, in the second case the interval falls in two weeks.

    if ($the_first_day_of_week < $the_last_day_of_week){

        if ($the_first_day_of_week <= 6 && 6 <= $the_last_day_of_week) $no_remaining_days--;

        if ($the_first_day_of_week <= 7 && 7 <= $the_last_day_of_week) $no_remaining_days--;

    }

    else{

        if ($the_first_day_of_week <= 6) $no_remaining_days--;

        //In the case when the interval falls in two weeks, there will be a Sunday for sure

        $no_remaining_days--;

    }



    //The no. of business days is: (number of weeks between the two dates) * (5 working days) + the remainder

    $workingDays = $no_full_weeks * 5 + $no_remaining_days;



    //We subtract the holidays

    foreach($holidays as $holiday){

        $time_stamp=strtotime($holiday);

        //If the holiday doesn't fall in weekend

        if (strtotime($startDate) <= $time_stamp && $time_stamp <= strtotime($endDate) && date("N",$time_stamp) != 6 && date("N",$time_stamp) != 7)

            $workingDays--;

    }



    return $workingDays;

}



//Example:



$holidays=array("2006-12-25","2006-12-26","2007-01-01");



echo getWorkingDays("2006-12-22","2007-01-06",$holidays)

// => will return 8

?>

mtphotographer at yahoo dot com
31-Jan-2007 12:37


Determine what is next month:

I Had the same issue as matt_wbdi at hotmail dot com



Simple solution is use 1 for the day instead of date("d"), it didnt seem to matter if I use "m", or "n" for the month.



// eg:

// if today is 2007-01-30 the following:

$datePlusoneMonth = mktime(0, 0, 0, date("m")+ 1, date("d"), date("Y"));

echo date("Y-m", $datePlusoneMonth);

//returns 2007-03 which is not next month



// this worked for me:

$datePlusoneMonth = mktime(0, 0, 0, date("m")+ 1, 1, date("Y"));

echo date("Y-m", $datePlusoneMonth);

// returns 2007-02, which IS next month

matt_wbdi at hotmail dot com
30-Jan-2007 06:06


The below code doesn't work. The $next_month variable, for instance, right now, will be March, even though today is January 30th. The reason is because one month from Jan. 30th is March. But that's not the next month. I would suggest using an array of Month names instead, with their respective number as the key.

kriswarner at solidaritymail dot com
24-Jan-2007 02:40


Here's a useful bit of code - I took Mushy's code for 

displaying a calendar, and added links for viewing previous

 and next months, so you can go ahead or backwards as many months as you like, one month at a time.  



Basically the top row is changed, and looks like:



December (prev)               January                 February (next)



Here it is:  



<?

//determining action, current month and year

$action = $_REQUEST['action'];

if (!$action) //first page, set current_month variable = current month

{

$current_month = date("m"); //value will change if the user changes the month they are viewing

$current_year = date('Y');

}

else //if user selected to go to previous or next month, reset current_month variable

{

$current_month = $_REQUEST['current_month'];

$current_year = $_REQUEST['current_year'];



    if ($action == 'prev')

    {

    $current_month = date('m', mktime(0, 0, 0, $current_month-1));

         //if going from january to december, change year as well

         if ($current_month == '12')

         {

         $current_year = date('Y', mktime(0, 0, 0, $current_month, 1, $current_year-1));

         }

    }

    if ($action == 'next')

    {

    $current_month = date('m', mktime(0, 0, 0, $current_month+1));

         //if going from december to january, change year as well

         if ($current_month == '01')

         {

         $current_year = date('Y', mktime(0, 0, 0, $current_month, 1, $current_year+1));

         }

    }

}



$previous_month = date('F', mktime(0, 0, 0, $current_month-1, date("d"),  date("Y")));

$next_month = date('F', mktime(0, 0, 0, $current_month+1, date("d"),  date("Y")));



$theday = date(w, mktime(0, 0, 0, $current_month, 1, $current_year));

$daysinmonth = date("t", mktime(0, 0, 0, $current_month, 1, $current_year));



echo "<table border=1 width=90%>";

echo "<tr><td><a href=$PHP_SELF?action=prev&current_month=".$current_month."

&current_year=".$current_year.">$previous_month</a></td>

<td colspan=5 align=center>".date('F Y', mktime(0, 0, 0, $current_month, 1, $current_year))."</td>

<td><a href=$PHP_SELF?action=next&current_month=".$current_month."

&current_year=".$current_year.">$next_month</a></td></tr>";

echo "<tr>";

echo "<td>Sunday</td>";

echo "<td>Monday</td>";

echo "<td>Tuesday</td>";

echo "<td>Wednesday</td>";

echo "<td>Thursday</td>";

echo "<td>Friday</td>";

echo "<td>Saturday</td>";

echo "</tr>";

echo "<tr>";

for ($i=0;$i<$theday;$i++)

{

   echo "<td>&nbsp;</td>";

}

for ($list_day=1;$list_day<=$daysinmonth;$list_day++)

{



   echo "<td>" . $list_day . "</td>";



   if ($theday == 6)

   {

       echo "</tr>";

       echo "<tr>";

       $theday = -1;

   }

   $theday++;

}

echo "</tr>";

echo "</table>";



?>

code at ashleyhunt dot co dot uk
18-Jan-2007 06:22


I wanted to shift an sql date forward by a set time period.

This is how I achived it... well handy.



<?

function sql_date_shift($date, $shift)

{

return date("Y-m-d H:i:s" , strtotime($shift, strtotime($date)));

}



// example usage



$date = "2006-12-31 21:00";

$shift "+6 hours"; // could be days, weeks... see function strtotime() for usage



echo sql_date_shift($date, $shift);



// will output: 2007-01-01 03:00:00

?>



Hope it is of use,

Ashley

wcc at techmonkeys dot org
23-Dec-2006 04:22


In example 3, <?php date("m") ?> is passed to mktime() for the month argument. I believe <?php date("n") ?> should be used instead so that the leading 0's don't make PHP think the arguments are octal values. The same goes for <?php date("j") ?> instead off <?php date("d") ?>.



<?php

    echo mktime(0, 0, 0, 09, 09, 2006);

    echo "\n";

    echo mktime(0, 0, 0, 9, 9, 2006);

?>



1133326800

1157774400

s.koch AT brindestorm.com
20-Dec-2006 07:51


mysql date format:



<?



$mysq_format_date = date("Y-m-d H:i:s");



?>

29-Nov-2006 04:26


if you are sending your data to a database, you can just send time() and then use strftime() to turn the time() string into readable time format. 



check both time() and strftime() functions both offer more or less same functionality as date(). date() can also be used with time() strings to display time in the past.



more or less with something like:



date("j F, Y - g:ia", $data['date_quoted'])



where time() = $data['date_quoted'] and time() is the exact time date when the string is executed. if this is done towards a database, the time() stored is the actual server time upon script execution, no matter the time set in the individual computer, this will record server time, unless a gmt is set in newer versions of php (5 and up).

jack at jtr dot de
27-Nov-2006 06:30


/**

     * Converts a date string from one format to another (e.g. d/m/Y => Y-m-d, d.m.Y => Y/d/m, ...)

     *

     * @param string $date_format1

     * @param string $date_format2

     * @param string $date_str

     * @return string

     */

    function dates_interconv( $date_format1, $date_format2, $date_str )

    {

        $base_struc     = split('[/.-]', $date_format1);

        $date_str_parts = split('[/.-]', $date_str );

        

        print_r( $base_struc ); echo "<br>";

        print_r( $date_str_parts ); echo "<br>";

        

        $date_elements = array();

        

        $p_keys = array_keys( $base_struc );

        foreach ( $p_keys as $p_key )

        {

            if ( !empty( $date_str_parts[$p_key] ))

            {

                $date_elements[$base_struc[$p_key]] = $date_str_parts[$p_key];

            }

            else

                return false;

        }

        

        $dummy_ts = mktime( 0,0,0, $date_elements['m'],$date_elements['d'],$date_elements['Y']);

        

        return date( $date_format2, $dummy_ts ); 

    }

    

    $df_src = 'd/m/Y';

    $df_des = 'Y-m-d';

    

    $iso_date = dates_interconv( $df_src, $df_des, '25/12/2005');

    

    output: 

    

    2005-12-25

Batman
17-Nov-2006 01:56


date("W") will not take into account US-system of weeks (it starts on Sunday).



Example:

According to ISO 8601, 1 Jan 2006 is on Sunday therefore in US-system 1 -- 7 January will be 52 week and not 1st!



But date() will print 1 and not 52.

Bandit
07-Nov-2006 10:06


So I wanted a little function to output an easy to read but inaccurate date. I came up with the following (probably very inefficient) little function;



<?php

    function ezDate($d) {

        $ts = time() - strtotime(str_replace("-","/",$d));

        

        if($ts>31536000) $val = round($ts/31536000,0).' year';

        else if($ts>2419200) $val = round($ts/2419200,0).' month';

        else if($ts>604800) $val = round($ts/604800,0).' week';

        else if($ts>86400) $val = round($ts/86400,0).' day';

        else if($ts>3600) $val = round($ts/3600,0).' hour';

        else if($ts>60) $val = round($ts/60,0).' minute';

        else $val = $ts.' second';

        

        if($val>1) $val .= 's';

        return $val;

    }

?>



Then I use it as follows;



<?php

    echo ucwords(ezDate('2006-09-07 18:42:00')).' Ago';

?>



Which would output;



    2 Months Ago



I add an acronym tag around the output also, so my users can mouse-over for the exact date.



Hope it helps someone!

Lionel
26-Oct-2006 05:38


my quick and dirty code to find the season of the current date



<?php

function season() {

    $limits=array('/12/21'=>'Winter', '/09/21'=>'Autumn', '/06/21'=>'Summer', '/03/21'=>'Spring', '/01/01'=>'Winter');

    foreach ($limits AS $key => $value) {

        $limit=date("Y").$key;

        if (strtotime($adate)>=strtotime($limit)) {

            return $value;

        }

    }

}

echo season();

?>



PS: the 21th is a good approach but not the real day.

lcapt at dplanet dot ch
26-Oct-2006 04:44


my quick and dirty code to find the season of the date



<?php

function season() {

    $limits=array('/12/21'=>'Winter','/09/21'=>'Autumn',

'/06/21'=>'Summer','/03/21'=>'Spring','/12/31'=>'Winter');

    foreach ($limits AS $key => $value) {

        $limit=date("Y").$key;

        if (strtotime("now")>strtotime($limit)) {

            return $value;

        }

    }

}

echo season();

?>



PS: the 21th is a good approach but not the real day.

admin [at] xorath [dot] com
24-Oct-2006 12:13


If you want to use the date function to fix the RFC-822 format from an allready made RSS 2.0 feed you can do it like this..



Maybe getting an external feed from another asp or php file that you cannot change, but want to have the correct dateformat for anyway.



<?php

    header('Content-type: application/rss+xml; charset=iso-8859-1');

    $xmlfile = simplexml_load_file($_GET[feedURL]);

    for ( $i = 0; $i < count($xmlfile->channel->item); $i++ )

        $xmlfile->channel->item[$i]->pubDate = date("r",strtotime((string)($xmlfile->channel->item[$i]->pubDate)));

    echo $xmlfile->asXML();

?>



Then simply link to your rss feed like this

filename.php?feedURL=http://www.example.com/rss.asp

filename.php?feedURL=http://www.example.com/rss.xml

filename.php?feedURL=http://www.example.com/rss.php



or what you want. Hope anyone can take advantage of this, I wrote it to help a friend which had date stored in database only by yyyy-mm-dd hh:mm:ss and retrieved via asp from another script.



Article at http://www.xorath.com/articles/?article=2

emailfire at gmail dot com
08-Oct-2006 01:39


To use the date("N") function in PHP < 5.1.0 use:



<?php

function dayofweek() {

$days = array("Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun");

return array_search(date("D"), $days) + 1;

}

?>

Mushy
30-Sep-2006 11:17


Heres a basic print out of a calender:



<?

$date_month = 7;

$date_year = 2006;



$theday = date(w, mktime(0, 0, 0, $date_month, 1, $date_year));

$daysinmonth = date("t", mktime(0, 0, 0, $date_month, 1, $date_year));

echo "<table border=1>";

echo "<tr>";

echo "<td>Sunday</td>";

echo "<td>Monday</td>";

echo "<td>Tuesday</td>";

echo "<td>Wednesday</td>";

echo "<td>Thursday</td>";

echo "<td>Friday</td>";

echo "<td>Saturday</td>";

echo "</tr>";

echo "<tr>";

for ($i=0;$i<$theday;$i++)

{

    echo "<td>&nbsp;</td>";

}

for ($list_day=1;$list_day<=$daysinmonth;$list_day++)

{



    echo "<td>" . $list_day . "</td>";



    if ($theday == 6)

    {

        echo "</tr>";

        echo "<tr>";

        $theday = -1;

    }

    $theday++;

}

echo "</tr>";

echo "</table>";

?>

Michiel
29-Sep-2006 12:08


If you want to count quarters between dates you can use the following:



function countQuarters($begindate, $enddate)

        {

            if (!isset($begindate) || empty($begindate) || !isset($enddate) || empty($enddate))

                return -1;

            

            $countyears = date("Y", strtotime($enddate)) - date("Y", strtotime($begindate));

            $quarters = 0;

            

            if (date("Y", strtotime($enddate)) == date("Y", strtotime($begindate)))

            {

                if (date("m", strtotime($enddate)) != date("m", strtotime($begindate)))

                {

                    if (date("m", strtotime($enddate)) > date("m", strtotime($begindate)))

                    {

                        $difference = date("m", strtotime($enddate)) - date("m", strtotime($begindate));

                        

                        $quarters += ceil((int) $difference / 4);

                    }

                    else

                    {

                        return -1;

                    }

                }

            }

            else

            {

                $quarters = (int) $countyears * 4;

                if (date("m", strtotime($enddate)) != date("m", strtotime($begindate)))

                {

                    if (date("m", strtotime($enddate)) > date("m", strtotime($begindate)))

                    {

                        $difference = date("m", strtotime($enddate)) - date("m", strtotime($begindate));

                        

                        $quarters += ceil((int) $difference / 4);

                    }

                    else

                    {

                        $afterbegin = 12 - (int) date("m", strtotime($begindate));

                        $untilend = date("m", strtotime($enddate));

                        

                        $quarters = ($quarters - 4) + ceil(($afterbegin + $untilend) / 4);

                    }

                }

            }

            

            return $quarters;

        }

mandi tek shqiperia.com
15-Sep-2006 11:15


If you have a date in the english format"Thu Sep 07 23:59:35 CEST 2006" (some times generated from logs or other systems) and you need to translate it in mm/dd/yyyy you can use the following function!

//$data="Thu Sep 07 23:59:35 CEST 2006"; 



function formadatedb($data)

{

    $dt=explode(" ", $data);

    $year=array ("Jan"=>1, "Feb"=>2, "Mar"=>3, "Apr"=>4, "May"=>5, "Jun"=>6, "Jul"=>7, "Aug"=>8, "Sep"=>9,"Oct"=>10,"Nov"=>11,"Dec"=>12);

    return $year[$dt[1]]."/".$dt[2]."/".$dt[5];

}

russ at isitaboat dot co dot uk
06-Sep-2006 11:18


Easy way of switching between mysql and "normal" dates (english, not american)...



<?php

function flipdate($dt, $seperator_in = '-', $seperator_out = '-')

{

return implode($seperator_out, array_reverse(explode($seperator_in, $dt)));

}

?>

michiel at mb-it dot nl
04-Sep-2006 09:59


***EDITOR NOTE: Referred to note has been removed.





The calculation function of the number of days between 2 dates by zzzdobr at gmai dot com could be done much easier:





<?


function getdays($day1,$day2)


{


  return round((strtotime($day2)-strtotime($day1))/(24*60*60),0);


}





$begin = date("Y/m/d"); // we set today as an example


$end = "2006/11/27";


getdays($begin,$end);


?>





So now all of you know how many days you have left to buy me a birthday present ;)

James
29-Aug-2006 09:45


Slightly modified the code provided by "martin at smttuk dot com" so that you can give the function a date and/or time that you choose;



<?php

    function zonedate($layout, $countryzone, $daylightsaving, $time)

    {

        if($daylightsaving) {

            $daylight_saving = date('I');

            if($daylight_saving){ $zone=3600*($countryzone+1); }

        }

        else {

            if( $countryzone>>0){ $zone=3600*$countryzone; }

            else { $zone=0; }

        }

        if(!$time) { $time = time(); }

        $date = gmdate($layout, $time + $zone);

        return $date;

    }

?>



For example if I wanted the time and date of my birthday in New Zealand time;



<?php

    echo zonedate('Y-m-d H:i:s',-12,true,mktime(18,46,0,9,7,1986));

?>

Corey
28-Aug-2006 09:55


It's pretty simple, but in case anybody else is having problems getting the exact time they need because of DST (ex: on a Windows box in an area without DST), you can fix it all in a single line. Example...



<?php

    echo "The time is " . date((date("I") ? intval(date("g")) - 1 : date("g")) . ":i m/d/y") . ".";

?>

martin at smttuk dot com
25-Aug-2006 08:30


/* Country Zone : Time Zone Name

-12 : Dateline Standard

-11 : Samoa Standard Time

-10 : Hawaiian Standard Time

-8 : Pacific Standard Time

-7 : Mexican Standard Time, Mountain Standard Time

-6 : Central Standard Time, Mexico Standard Time

-5 : Eastern Standard Time Eastern Time, SA Pacific Standard Time

-4 : Atlantic Standard Time, SA Western Standard Time, Pacific SA Standard Time

-3.5 : Newfoundland Standard Time

-3 : SA Eastern Standard Time, E. South America Standard Time

-2 : Mid:Atlantic Standard Time

-1 : Azores Standard Time, Cape Verde Standard Time

0 : Universal Coordinated Time, Greenwich Mean Time

1 : Romance Standard Time, Central Africa Standard Time, Central European Standard Time

2 : Egypt Standard Time, South Africa Standard Time, E. Europe Standard Time, FLE Standard Time, GTB Standard Time

3 : Arab Standard Time, E. Africa Standard Time, Arabic Standard Time, Russian Standard Time

3.5 : Iran Standard Time

4 : Arabian Standard Time, Caucasus Standard Time, Afghanistan Standard Time

5 : West Asia Standard Time

5.5 : India Standard Time

5.75 : Nepal Standard Time

6 : Central Asia Standard Time

6.5 : Myanmar Standard Time

7 : SE Asia Standard Time, North Asia Standard Time

8 : China Standard Time, W. Australia Standard Time, Singapore Standard Time, Taipei Standard Time, North Asia East Standard Time

9 : Tokyo Standard Time, Korea Standard Time, Yakutsk Standard Time

9.5 : AUS Central Standard Time, Cen. Australia Standard Time

10 : AUS Eastern Standard Time, E. Australia Standard Time

West Pacific Standard Time, Tasmania Standard Time, Vladivostok Standard Time

11 : Central Pacific Standard Time

12 : Fiji Standard Time, New Zealand Standard Time

13 : Tonga Standard Time



* How to use



   $layout = 

       Same function as date : http://uk2.php.net/manual/en/function.date.php

   $countryzone = 

       Country Zone from Above Eg: 0 ,for Greenwich Mean Time

   $daylightsaving = 

       Set true if the Country has daylight saving it will auto change. 

       Set false if the Country dose not have daylight saving or wish to it Disabled.

       (About Daylight Saving go here : http://www.timeanddate.com/time/aboutdst.html)

   Call Function:

       zonedate($layout, $countryzone, $daylightsaving);

   

   E.g.

   If GMT = Friday 25th of August 2006 10:23:17 AM

   When Function called:

   // West Asia Standard Time (Country Uses daylight saving)

       echo zonedate("l dS \of F Y h:i:s A", 5, true); 

   //Output : Friday 25th of August 2006 03:23:17 PM

*/



function zonedate($layout, $countryzone, $daylightsaving)

{

if ($daylightsaving){

$daylight_saving = date('I');

if ($daylight_saving){$zone=3600*($countryzone+1);} 

}

else {

   if ($countryzone>>0){$zone=3600*$countryzone;}

       else {$zone=0;}

}

$date=gmdate($layout, time() + $zone);

return $date;

}

Ron
10-Aug-2006 02:34


Example 3 is really very bad programming practice.  Calling date() more than once and putting the results together, can cause you to have a date or time that is inconsistent, or just plain invalid, because the system clock could easily change between the calls.



Instead, call time() once up front to get the timestamp, then pass that into each call to date() like this:



<?php

$now = time();

$tomorrow  = mktime(0, 0, 0, date("m", $now)  , date("d", $now)+1, date("Y", $now));

$lastmonth = mktime(0, 0, 0, date("m", $now)-1, date("d", $now),  date("Y", $now));

$nextyear  = mktime(0, 0, 0, date("m", $now),  date("d", $now),  date("Y", $now)+1);

?>



By doing this, we ensure that we're using the same system clock sampling for all date/time field formatting, thereby ensuring the results are consistent.

mwwaygoo AT hotmail DOT com
10-Aug-2006 12:11


Number of weeks per month



I was trying to do a monthly calendar and required the number of weeks in a month, running from Monday to Sunday. Since PHP doesn't have this in its date() parameters I had to calculate it in a roundabout manner. By subtracting the week numbers away from each other we SHOULD get the number of weeks, since it is calculated on Mondays.



<?php

$year = date("Y", $date);

$month = date("m", $date);

if( (isset($_GET['year'])) && (intval($_GET['year']) > 1582) )

{

    $year = intval($_GET['year']);

}

if( (isset($_GET['month'])) && (intval($_GET['month']) >= 1) && (intval($_GET['month']) <= 12) )

{

    $month = intval($_GET['month']);

}

$date = mktime(1, 1, 1, $month, date("d"), $year);



$first_day_of_month = strtotime("-" . (date("d", $date)-1) . " days", $date);

$last_day_of_month = strtotime("+" . (date("t", $first_day_of_month)-1) . " days", $first_day_of_month);



$first_week_no = date("W", $first_day_of_month);

$last_week_no = date("W", $last_day_of_month);



if($last_week_no < $first_week_no) $last_week_no=date("W", strtotime("-1 week",$last_week_no)) + 1;

$weeks_of_month = $last_week_no - $first_week_no + 1;



?>



The check for weeknumber of the end of the month being smaller than the beginning of the month, is because of December. Where Monday 31st is actually in the first week of the following year.

The +1 adjustment is for the number of weeks, inclusive. ie if January had five week, then 5-1=4, so we need to add an extra one to make it 5.

Phil Sylvia
09-Aug-2006 01:05


I simplified this after I figured it out based upon Mel Boyce's simple solution. Thanks Mel!



 I wanted to calculate dates based upon any given date and not just todays date which is what the hundreds of examples on the Internet use.  I created a simple function and then just call the function with 2 parameters.. the date (string) to test and the number of days that I want to add (positive #) or subtract (negative #) My intended use is to retrieve dates from the database and perform the date calculations.  This makes it simple.  I hope this helps someone as frustrated as I was. Enjoy.



******************************************

<?php



// date calculation function

// adds or subtracts a date based upon the input.

// $this_date is a string format of a valid date ie.. "2006/08/11"

// $num_days is the number of days that you would like to add (positive number) or subtract (negative number)



function fnc_date_calc($this_date,$num_days){

    

    $my_time = strtotime ($this_date); //converts date string to UNIX timestamp

    $timestamp = $my_time + ($num_days * 86400); //calculates # of days passed ($num_days) * # seconds in a day (86400)

     $return_date = date("Y/m/d",$timestamp);  //puts the UNIX timestamp back into string format

    

    return $return_date;//exit function and return string

}//end of function



$date_to_test = "2006/08/11";

$days_to_add = 7;



$past_date = fnc_date_calc($date_to_test,(($days_to_add)*-1));

$future_date = fnc_date_calc($date_to_test,$days_to_add);



echo "Test Date is:   ".$date_to_test;

echo "<br>";

echo "Number of days to Calculate is: ".$days_to_add;

echo "<br>";

echo "Past date is:   ".$past_date;

echo "<br>";

echo "Future date is: ".$future_date;

?>

Matt_B at TinyOnline dot co dot uk
05-Aug-2006 12:00


In response to the getLastWeekDay() function:


***^ EDITOR NOTE: Referred to note was removed 2006-09-07.





Changing dates for any reason by adding/subtracting secret is a really bad idea. Daylight savings will totally screw up the calculations. Your best bets are the awesome strtotime features. To get last monday for example:





$var = strtotime('last monday');





Strtotime can do all sorts of funky stuff like this.

sea at zzti dot edu dot cn
03-Aug-2006 06:03


in PHP and MySQL,the day of year is different:

<?php

echo date('z',strtotime('2006-01-01'));  // print: 0

?>

mysql > SELECT DAYOFYEAR('2006-01-01');  // print: 1

28-Jul-2006 06:03


For PHP 4 users wanting a format similar to ISO 8601 (http://www.w3.org/TR/NOTE-datetime):



    echo date('Y-m-d H:i:s.0T');



returns something like 2006-07-27 16:54:14.0EDT

rev at NOSPAMO dot returntothepit dot com
28-Jul-2006 03:48


the CORRECT MySQl datetime format is

<?php

$date = "Last Saturday";

date("Y-m-d H:i:s",strtotime($date));



$sql = "INSERT INTO pictureusageindex (`subject`,`date`) VALUES ('$subject','$date')";



echo "$sql<br>";

?>



a person who posted above is wrong. leaving out the "-"

Bartlomiej B dot (berdzii at o2 dot pl)
25-Jul-2006 09:41


To calculate current quarter of the year we can use this simple function:



function quarter()

{

  return ceil(date("m")/3);

}

Alvin Delagon
20-Jul-2006 06:48


Here's a function that takes the year as input and returns an array or dates that are mondays. (It can be used for generating weekly reports just like I did)



function getMondays($year) {

  $newyear = $year;

  $week = 0;

  $day = 0;

  $mo = 1;

  $mondays = array();

  $i = 1;

  while ($week != 1) {

    $day++;

    $week = date("w", mktime(0, 0, 0, $mo,$day, $year));

  }

  array_push($mondays,date("r", mktime(0, 0, 0, $mo,$day, $year)));

  while ($newyear == $year) {

    $test =  strtotime(date("r", mktime(0, 0, 0, $mo,$day, $year)) . "+" . $i . " week");

    $i++;

    if ($year == date("Y",$test)) {

      array_push($mondays,date("r", $test));

    }

    $newyear = date("Y",$test);

  }

  return $mondays;

}

dulare at gmail dot com
14-Jul-2006 12:36


If You are looking for some simple date calculations:



<?



function days_between($fyear, $fmonth, $fday, $tyear, $tmonth, $tday)

{

  return abs((mktime ( 0, 0, 0, $fmonth, $fday, $fyear) - mktime ( 0, 0, 0, $tmonth, $tday, $tyear))/(60*60*24));

}



function day_before($fyear, $fmonth, $fday)

{

  return date ("Y-m-d", mktime (0,0,0,$fmonth,$fday-1,$fyear));

}



function next_day($fyear, $fmonth, $fday)

{

  return date ("Y-m-d", mktime (0,0,0,$fmonth,$fday+1,$fyear));

}



function weekday($fyear, $fmonth, $fday) //0 is monday

{

  return (((mktime ( 0, 0, 0, $fmonth, $fday, $fyear) - mktime ( 0, 0, 0, 7, 17, 2006))/(60*60*24))+700000) % 7;

}



function prior_monday($fyear, $fmonth, $fday)

{

  return date ("Y-m-d", mktime (0,0,0,$fmonth,$fday-weekday($fyear, $fmonth, $fday),$fyear));  

}



?>

Elena S.
06-May-2006 06:36


If you do not PHP5 yet but want a week day to be in ISO format: 1 (for Monday) through 7 (for Sunday), you can use this:

<?



//GET WEEK DAY 0 FOR SUNDAY, 6 FOR SATURDAY

$x = date( "w" );



$corrected_week_day = 7 - ( (7-$x) % (7+$x) );



?>

mel dot boyce at gmail dot com
06-Apr-2006 08:46


I've been flicking through the comments looking for some succinct date code and have noticed an alarming number of questions and over-burdened examples related to date mathematics. One of the most useful skills you can utilize when performing date math is taking full advantage of the UNIX timestamp. The UNIX timestamp was built for this kind of work.



An example of this relates to a comment made by james at bandit-dot-co-dot-en-zed. James was looking for a way to calculate the number of days which have passed since a certain date. Rather than using mktime() and a loop, James can subtract the current timestamp from the timestamp of the date in question and divide that by the number of seconds in a day:

<?php

$days = floor((time() - strtotime("01-Jan-2006"))/86400);

print("$days days have passed.\n");

?>



Another usage could find itself in a class submitted by Kyle M Hall which aids in the creation of timestamps from the recent past for use with MySQL. Rather than the looping and fine tuning of a date, Kyle can use the raw UNIX timestamps (this is untested code):

<?php

$ago = 14; // days

$timestamp = time() - ($ago * 86400);

?>



Hopefully these two examples of "UNIX-style" timestamp usage will help those finding date mathematics more elusive than it should be.

SpikeDaCruz
10-Mar-2006 04:12


The following function will return the date (on the Gregorian calendar) for Orthodox Easter (Pascha).  Note that incorrect results will be returned for years less than 1601 or greater than 2399. This is because the Julian calendar (from which the Easter date is calculated) deviates from the Gregorian by one day for each century-year that is NOT a leap-year, i.e. the century is divisible by 4 but not by 10.  (In the old Julian reckoning, EVERY 4th year was a leap-year.)



This algorithm was first proposed by the mathematician/physicist Gauss.  Its complexity derives from the fact that the calculation is based on a combination of solar and lunar calendars.



<?

function getOrthodoxEaster($date){

  /*

   Takes any Gregorian date and returns the Gregorian

   date of Orthodox Easter for that year.

  */

  $year = date("Y", $date);

  $r1 = $year % 19;

  $r2 = $year % 4;

  $r3 = $year % 7;

  $ra = 19 * $r1 + 16;

  $r4 = $ra % 30;

  $rb = 2 * $r2 + 4 * $r3 + 6 * $r4;

  $r5 = $rb % 7;

  $rc = $r4 + $r5;

  //Orthodox Easter for this year will fall $rc days after April 3

  return strtotime("3 April $year + $rc days");

}

?>

erwinmoller at xs4all dot nl
05-Jan-2006 09:34


If you need dates that are prior to 1970 (or 1901 for php5.1), have a look at calendar at this very site:

http://www.php.net/calendar

martin dot m at hid dot gr
20-Dec-2005 01:25


"It worked ok, except I noticed it had some trouble if you were spanning months, (i.e. 03-29-2005 to 04-10-2005)"



this is the (Daylight Saving Time ) problem. you can check if the start date and the end date are 

whether or not in daylights savings time by using 

date('I',$your_date) and to add or decrease with one hour.

Nick H
24-Nov-2005 11:21


Users in GMT may find some information on British Summer Time useful. Personally I was confused that date() for a timestamp of 0 was returning 1am, until I found about the all-year BST from 1968-71.



http://wwp.greenwichmeantime.com/info/bst2.htm

itsacon at itsacon dot net
16-Nov-2005 07:28


Caveat when using the 'W' and 'w' options together:



The 'W' option uses the ISO-8601 standard (week ends on sunday), whereas the 'w' option has the week _start_ on sunday (sunday == 0).

vernon at vernonkesner dot com
03-Nov-2005 02:37


The examples for getting a date in the past or future is simply not the best way to do it.  Especially if you are doing it dynamically.



I find the best way to get a date in the past or future is like this:



<?php

//get timestamp for past/future date I want

$pf_time = strtotime("-3 days");

//format the date using the timestamp generated

$pf_date = date("Y-m-d", $pf_time);

?>

martin at kurahaupo dot gen dot nz
31-Oct-2005 06:52


There is a mistaken impression that the maximum difference between UTC and localtime is +/- 12 hours. Right now it is summer here in New Zealand, and we're 13 hours ahead of UTC, and further east in the Chatham Islands it's UTC+13:45.



Consequently, the range for the "Z" conversion is at least -43200 ... +49500

mbirth at webwriters dot de
25-Oct-2005 07:24


Using 'B' for the Swatch Internet Time (i.Beats) can still lead to misunderstandings, because the date given in the resulting string is the local date, not the date of the BMT (Biel Mean Time / UTC+0100) after which the i.Beats are counted. So while @000 is equal all around the globe, October 25th 2005 @000 in Chicago is really October 24th, 06:00 PM local time.



Otherwise, if you use date('d M Y @B') in Chicago on that day at 6pm, it will return "24 Oct 2005 @000" although it should be "25 Oct 2005 @000".



So it may happen that you miss an appointment by 24 hours (or 1000 Beats ;-)



Here's a way to return the Internet Time with correct date:



<?php

  $curtime = time();

  $utcdiff = date('Z', $curtime);  // get difference to UTC in seconds

  $bmttime = $curtime - $utcdiff + 3600;   // BMT = UTC+0100

  $ssm = date('H', $bmttime)*3600 + date('i', $bmttime)*60 + date('s', $bmttime);  // seconds since midnight (BMT)

  $ibeats = $ssm/86.4;  // 86400 seconds = 1000 beats, so 1 beat = 86.4 seconds



  echo 'i.Beats     : ' . date('D, d M Y', $bmttime) . ' @' . $ibeats;

?>



Note: If you would try date('D, d M Y @B', $bmttime), the resulting beats would be wrong because the timezone used for calculation of the beats within the date() function is still your local one but the timestamp is UTC+0100. Another working way would be:



<?php

  $curtime = time();

  $utcdiff = date('Z', $curtime);  // get difference to UTC in seconds

  $bmttime = $curtime - $utcdiff + 3600;   // BMT = UTC+0100



  echo 'i.Beats     : ' . date('D, d M Y', $bmttime) . ' @' . date('B', $curtime);

?>



But this way there are no floating-point beats possible, which may be handy sometimes.

mendoza at pvv dot ntnu dot no
14-Oct-2005 02:38


At "daykay at pdsoftware dot de":



09 != 9 so there's nothing wrong about European vs. American formats.



$ php -r 'print 09; print "\n"; print 9; print "\n";'

0

9



09 is treated as octal and since octal numbers only use the 0-7 digits, it evaluates to 0. All numbers prefixed with 0 are considered octal just as 0x are considered hexadecimal.



http://en.wikipedia.org/wiki/Computer_numbering_formats

kbrill at multi dot com
16-Sep-2005 12:27


I created a routine that fills an array with the dates in the current week.  For example $WeekDays[0] is sunday's date, $WeekDays[1] is monday's date and so on no matter what day of the week it is today.



<?php

        $lowEnd=date("w");

        $lowEnd=-$lowEnd;

        $highEnd=$lowEnd + 6;

        $weekday=0;

        for ($i=$lowEnd; $i<=$highEnd; $i++) {

            $WeekDate[$weekday]=date("m/d",mktime(0, 0, 0, date("m")  , date("d")+$i, date("Y")));

            $weekday++;

        }

?>

webmaster [AT] gn-solutions [DOT] de
07-Sep-2005 08:19


For users who want a different language than english, you can user strftime() function in combination with setlocale() instead of date():



e.g. for german language:



With date you would write:

<?php

echo date('l, d. F Y'); //Output: Wednesday, 07. September 2005

?>



With strftime() you can output it in german like this:

<?php

// Set the gloabal LC_TIME constant to german

setlocale(LC_TIME, 'de_DE');

// Little bit other Syntax but better effect

echo strftime('%A, %d. %B %Y'); //Output: Mittwoch, 07. September 2005

?>



Greetings, Andy!

steve at somejunkwelike dot com
17-Aug-2005 03:01


re: Paul_liversidge...



This is a way to get the next 10 business days, by comparing the day of the week to not be saturday or sunday.  change the top two variables to get various different results...  if you want to get the next 10 business days, starting in two days from today, change the first variable to 2, and the second to 14.  This should yield the next 10 working days.



<?php 



$how_many_business_days_ahead = 0;

$how_many_business_days_to_count = 7;



for ($i=0;$i<$how_many_business_days_to_count;$i++)

    {

    $jump=$i+$how_many_business_days_ahead;

    $evalday = mktime(strftime ("%d/%m/%Y", strtotime("+$jump days")));

    $theday = strftime("%A", strtotime("+$jump days"));    

    if($theday != "Saturday" and $theday != "Sunday")

        {

        $days = $how_many_business_days_ahead+$i;

        $the_days[$j] = strftime("%A, %B %d, %Y", strtotime("+$jump days"));

        $j++;

        }

    }

    

    $k = $how_many_business_days_ahead;

    

    foreach($the_days as $eachday)

        {

        echo "$k business days from now = $eachday<br />";

        $k++;

        }

    

    

?>



results:



0 business days from now = Tuesday, August 16, 2005

1 business days from now = Wednesday, August 17, 2005

2 business days from now = Thursday, August 18, 2005

3 business days from now = Friday, August 19, 2005

4 business days from now = Monday, August 22, 2005

Rob Muhlestein
06-Aug-2005 02:48


All functions that have anything to do with the internal 32-bit constrained time() system call will have this same limitation. Hopefully we'll be 64 bit by long before then, although this already creating problems with UNIX internals.

ove at junne dot dk
03-Aug-2005 03:39


I seems to me that we're rapidly apporaching another Y2K event. The date-function only handles dates up to 2038, and this is only some 30 years away. Even today is it impossible to use date() to represent my children's 50 years birthday.





Just think about it, when you're designing your code.





[ed.: This limitation is gone in PHP 5.1 and higher, although PHP itself limits integers still to 32bit]

stuff at rushsoft dot de
30-Jun-2005 06:13


ISO 8601:2000 defines:

[...] day of the year is represented by three decimal digits. The first day of any year is represented by [001] and

subsequent days are numbered in ascending sequence [...]



So don't forget increasing the return value of date("z") by one to be ISO conform, if you use this, for instance, on presentation level.

witcho at gmail dot com
08-Jun-2005 01:22


When using 'z' it should be used as how many days have passed since the beginning of the year; not as the day of the year. 

"January 1" is the day 1 of the year not the day 0. 

Better to add 1 when using 'z' if you really want to know the day of the year.

MG_Peter at o2 dot pl
30-Apr-2005 09:05


easy way - to convert a "datetime" form mySQL into php date format....

first - get the array form mySQL, then use



<?php

date("d M Y H:i:s", strtotime($your_row['lastlogin_date']))

?>



strtotime - easy converts a datetime timestamp into time  ( time() or date("U")).

llewellyntd at gmail dot com
29-Apr-2005 09:50


Here is a very easy way to get the difference, in days, between two dates:



$days = (strtotime("2005-12-31") - strtotime(date("Y-m-d"))) / (60 * 60 * 24);

print $days;

jon AT standardise DOT us
16-Feb-2005 01:57


Don't forget that months start on the 1st day, and not a zero date.  Might seem obvious but:



$test = date("F Y", mktime(0, 0, 0, 12, 0, 2005));



Will return November 2005, not December.



$test = date("F Y", mktime(0, 0, 0, 12, 1, 2005));



The 1st is needed to get the right month.

ag nodot nospam at netside dot de
29-Jan-2005 12:19


Calculus of weeks in a year.



Since there is date("W") many still seem to have a problem regarding how many weeks there are in an year. Some rather complex solutions have been shown here.



It's defined, that a week which begins in december and ends in january the following year belongs to the year where most of its days lie. Therefore a week with at least 4 days in december is the last week of that year and a week with at least 4 days in january is the first week in the new year.



This concludes, that the last week of a year always contains the 28th day of december. So if you take date("W") on that day of a given year you always get the correct number of weeks for that year.

The other end of that definition is that the 4th day of january always lies in the first week of a year.



I hope this solves a lot of confusion.



(For those asking what all this fuzz about counting weeks is about: normally theres 52 weeks in a year but sometimes its 53 weeks in a year)



I wrote it down as a function, but as this is rather trivial one might consider using the date(...) only.



function weeks($year) {

    return date("W",mktime(0,0,0,12,28,$year));

}

php at document-root dot de
15-Apr-2004 02:02


To convert an unix timestamp to suite the syntax of a GeneralizedTime attribute for OpenLDAP, you can use

date ('YmdHiZO'). Note that this conversion uses local time, the recommended way is to store dates in UTC.



If your date is in UTC, just use

date ('YmdHiZ').'Z' to convert it ("Z" stands for "Zulu", which is UTC).

daniel
18-Feb-2004 07:43


The following function will return the date (on the Gregorian calendar) for Orthodox Easter (Pascha).  Note that incorrect results will be returned for years less than 1601 or greater than 2399. This is because the Julian calendar (from which the Easter date is calculated) deviates from the Gregorian by one day for each century-year that is NOT a leap-year, i.e. the century is divisible by 4 but not by 10.  (In the old Julian reckoning, EVERY 4th year was a leap-year.)



This algorithm was first proposed by the mathematician/physicist Gauss.  Its complexity derives from the fact that the calculation is based on a combination of solar and lunar calendars.



<?

function getOrthodoxEaster($date){

  /*

    Takes any Gregorian date and returns the Gregorian

    date of Orthodox Easter for that year.

  */

  $year = date("Y", $date);

  $r1 = $year % 19;

  $r2 = $year % 4;

  $r3 = $year % 7;

  $ra = 19 * $r1 + 16;

  $r4 = $ra % 30;

  $rb = 2 * $r2 + 4 * $r3 + 6 * $r4;

  $r5 = $rb % 7;

  $rc = $r4 + $r5;

  //Orthodox Easter for this year will fall $rc days after April 3

  return strtotime("3 April $year + $rc days");

}

?>

add a note

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Last updated: Mon, 05 Feb 2007