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Just stumbled upon this weird bug with php's DateTime object... Check this out:

<?php
$date = 1335823200;
echo date('d',$date);
echo '<br />';
$date = new DateTime("@$date");
echo $date->format('d');
?>

Returns:

06
05

It doesn't happen with any timestamp. I suspect that it has something to do with different timezones, but playing around with setlocale() didn't help anything. By the way, the '@' in the DateTime is needed to be able to use unix timestamps (see bug report here). Here a few more timestamps to test:

1333663200
1338588000
1338847200
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1 Answer

up vote 2 down vote accepted

Since you did not specify timezone for DateTime it is supposed that it is UTC, while date respects current timezone (specified by date_default_timezone_set or taken from php.ini). Just execute this and see:

$date = 1335823200;
echo date('d-m-Y  H:i:s',$date);
echo '<br />';
$date = new DateTime("@$date");
echo $date->format('d-m-Y H:i:s');
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Damn, I thought it would both just use the settings from the same source. Do you know if I can globally define a default for DateTime (before instanciating)? – Anonymous Oct 7 '11 at 2:48
@danontheline: manual says that php should use default timezone, but actually on my php 5.2 it is not correct. Probably it has been fixed in 5.3 – zerkms Oct 7 '11 at 2:51

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