DateTime will recognise any number up to 12 as a [month], and any number up to 31 as a [day]; it calculates the resulting date to be [day] days after the start of [month]. This means that when a datetime object is created with more days than are found in that month, the date will be beyond the end of the month.
<?php
$test = new DateTime('02/31/2011');
echo date_format($test, 'Y-m-d H:i:s'); // 2011-03-03 00:00:00
$test = new DateTime('06/31/2011');
echo date_format($test, 'Y-m-d H:i:s'); // 2011-07-01 00:00:00
?>
Description
This function is an alias of: DateTime::__construct()
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User Contributed Notes 9 notes
php at andysdrawings dot co dot uk ¶
2 years ago
Andrew ¶
1 year ago
Indeed as mentioned above the constructor for DateTime will allow the day of month upto 31 to be accepted for all months of the year. You should use checkdate if you wish to check that the day of the month represents a valid gregorian calendar date.
Marton Bodonyi ¶
1 year ago
If you are getting an error like this:
Exception: DateTime::__construct(): Failed to parse time string (13/02/2013) at position 0 (1): Unexpected character in DateTime->__construct()
Note that when you create a new date object using a format with slashes and dashes (eg 02-02-2012 or 02/02/2012) it must be in the mm/dd/yy(yy) or mm-dd-yy(yy) format (rather than british format dd/mm/yy)! Months always before years (the american style) otherwise you'll get an incorrect date and may get an error like the one above (where PHP is crashing on trying to decode a 13th month).
Can catch you off guard because everything seems to be working fine and dandy until you hit a value over 12.
Dok ¶
7 years ago
If you want to create the DateTime object directly from a timestamp use this
<?php
$st = 1170288000 // a timestamp
$dt = new DateTime("@$st");
?>
See also: http://bugs.php.net/bug.php?id=40171
nizar dot jouini at gmail.com ¶
7 years ago
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.
djspillers at mac dot com ¶
6 years ago
Looks like the DateTime class does not exist in my PHP 5.1.5 installation. The only documentation I can find says this class shows up in PHP 5.2
artur at jedlinski dot pl ¶
7 years ago
"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
?>
]
me at jameswdunne dot com ¶
3 years ago
You should also be aware that DateTime has very lax date validation rules. It appears that all months have a maximum of 31 days.
For example, these will work fine:
<?php
$test = new DateTime('02/31/2011');
$test = new DateTime('06/31/2011');
?>
We all know that these dates are not real and are invalid so I think a good idea is to do some further validation on dates before creating a DateTime object with them.
tienhm at email dot thinknet dot vn ¶
11 months ago
The construct have some problem with date validate.
When you set
$datetime = DateTime::createFromFormat('Y-m-d H:i:s','2009-02-30 00:00:00');
it will be accepted but convert to 2009-03-02 00:00:00, it means the date was count on and plus 2 days
