Documentation on the DateTime object is sparse. Here's a good tutorial:
http://laughingmeme.org/2007/02/27/
looking-at-php5s-datetime-and-datetimezone/
date_create
(PHP 5 >= 5.1.0)
date_create — 新しい DateTime オブジェクトを返す
説明
DateTime date_create
([ string $time
[, DateTimeZone $timezone
]] )
DateTime DateTime::__construct
([ string $time
[, DateTimeZone $timezone
]] )
返り値
成功した場合に DateTime オブジェクト、失敗した場合に FALSE を返します。
date_create
mike at eastghost dot com
06-Feb-2008 05:16
06-Feb-2008 05:16
mroximoron
12-Dec-2007 12:15
12-Dec-2007 12:15
The string format here is a bit wrong, yes it accepts the same format, but not the same range as strtotime.
strtotime can't handle dates like 2100-01-01 while this one can..
jsnell at e-normous dot com
29-Oct-2007 08:22
29-Oct-2007 08:22
When using these functions inside of destructors or functions called as a result of being registered with register_shutdown_handler, be sure to use date_create() instead of new DateTime(). This is because new DateTime will throw an exception on failure, which is not permitted in any of the above circumstances. If new DateTime() does fail in one of these circumstances, you will get an error stating "Fatal error: Exception thrown without a stack frame in Unknown on line 0."
karsten at typo3 dot org
18-Sep-2007 01:03
18-Sep-2007 01:03
The manual says "Returns DateTime object on success or FALSE on failure".
I tried hard to provoke a failure, but I seem to always get a DateTime object back, even though the PHP log says things like: "Failed to parse time string (2007W992-11:16:47+00:00) at position 5 (9): Unexpected character"
So if you (need to) check the result, beware!
[red. in PHP 5.3 and higher, you can do that with DateTime::getLastErrors().]
Dok
05-Jul-2007 11:52
05-Jul-2007 11:52
If you want to create the DateTime object directly from a timestamp use this
<?
$st = 1170288000 // a timestamp
$dt = new DateTime("@$st");
?>
See also: http://bugs.php.net/bug.php?id=40171
artur at jedlinski dot pl
19-Apr-2007 09:47
19-Apr-2007 09:47
"String in a format accepted by strtotime()" is not 100% truth - you cannot pass timezone info in the string used as DateTime constructor, while you can do it with strtotime(). It may be a problem if you would like to create a date from GMT time and then display it in your local timezone, for example:
<?php
$timeZone = 'Europe/Warsaw'; // +2 hours
date_default_timezone_set($timeZone);
$dateSrc = '2007-04-19 12:50 GMT';
$dateTime = new DateTime($dateSrc);
echo 'date(): '.date('H:i:s', strtotime($dateSrc));
// correct! date(): 14:50:00
echo 'DateTime::format(): '.$dateTime->format('H:i:s');
// INCORRECT! DateTime::format(): 12:50:00
?>
[red. your claim that "is not 100% truth" is incorrect, you're seeing desired behavior here. The timezone passed as 2nd argument is used as a default fall back, in case the parsed string doesn't provide TZ information.]
So if you want to convert date between different timezones, you have to create two DateTimeZone objects - one for the input and one for output, like this:
<?php
$timeZone = 'Europe/Warsaw'; // +2 hours
$dateSrc = '2007-04-19 12:50';
$dateTime = new DateTime($dateSrc, new DateTimeZone('GMT'));
$dateTime->setTimeZone(new DateTimeZone($timeZone));
echo 'DateTime::format(): '.$dateTime->format('H:i:s');
// CORRECT! DateTime::format(): 14:50:00
?>
I'm not sure if this is a bug or desired behaviour.
[red. you don't have to do create two DateTimeZone objects, this works too:
<?php
$timeZone = 'Europe/Warsaw'; // +2 hours
$dateSrc = '2007-04-19 12:50 GMT';
$dateTime = new DateTime($dateSrc);
$dateTime->setTimeZone(new DateTimeZone($timeZone));
echo 'DateTime::format(): '.$dateTime->format('H:i:s');
// CORRECT! DateTime::format(): 14:50:00
?>
]
nizar dot jouini at gmail.com
07-Mar-2007 10:05
07-Mar-2007 10:05
date_create and other DateTime related functions are included by default only in PHP versions equal and greater than 5.2.
In PHP 5.1.2 this functionality is marked to be experimental and has to be enabled at compile time.