PHP: Weird DateInterval length calculation
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26-04-2021 - |
문제
While playing with PHP, I strucked on this :
<?php
$FebruaryTheFirst = \DateTime::createFromFormat('Y-m-d H:i:s', '2001-02-01 00:00:00');
$MarchTheSecond = \DateTime::createFromFormat('Y-m-d H:i:s', '2001-03-01 00:00:00');
$interval = $FebruaryTheFirst->diff($MarchTheSecond);
echo $interval->m.PHP_EOL; // Outputs 0. WTF?
$FebruaryTheFirstbis = \DateTime::createFromFormat('Y-m-d', '2001-02-01');
$MarchTheSecondbis = \DateTime::createFromFormat('Y-m-d', '2001-03-01');
$interval2 = $FebruaryTheFirstbis->diff($MarchTheSecondbis);
echo $interval2->m.PHP_EOL; // Outputs 1. WTF?
$FebruaryTheFirstter = \DateTime::createFromFormat('Y-m-d H:i:s', '2001-02-01 00:01:00');
$MarchTheSecondter = \DateTime::createFromFormat('Y-m-d H:i:s', '2001-03-02 00:01:00');
$interval3 = $FebruaryTheFirstter->diff($MarchTheSecondter);
echo $interval3->m.PHP_EOL; // Outputs 0. WTF?
$FebruaryTheFirstfour = \DateTime::createFromFormat('Y-m-d H:i:s', '2001-02-01 01:00:00');
$MarchTheSecondfour = \DateTime::createFromFormat('Y-m-d H:i:s', '2001-03-02 01:00:00');
$interval4 = $FebruaryTheFirstfour->diff($MarchTheSecondfour);
echo $interval4->m.PHP_EOL; // Outputs 1. WTF?
Question
I should always get 1
as output, as I'm always counting the number of month between Februar, 1st and March, 1st. But as shown previously, I also get 0
=> WTF?
For information my version of php is
PHP 5.3.8 (cli) (built: Jan 12 2012 19:12:32) Copyright (c) 1997-2011
The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend
Technologies with Xdebug v2.1.1, Copyright (c) 2002-2011, by Derick Rethans
해결책
It looks like this is a known bug in PHP. Have a look at the bug report. The only way to fix this, at least for now, is to work in UTC to eliminate local timezone issues.
Example:
// Get the current timezone.
$originalTimezone = @date_default_timezone_get();
// Work in UTC.
date_default_timezone_set('UTC');
// ...
$dateStart = new DateTime('2001-02-01');
$dateEnd = new DateTime('2001-03-01');
$interval = $dateStart->diff($dateEnd);
// Reset the timezone.
if ($originalTimezone) {
date_default_timezone_set($originalTimezone);
}
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