add one day to DateTime based on timestamp

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Hello,

When I create a DateTime object from a UNIX timestamp, and then add a one day interval, PHP adds 25 hours instead of 24. Is this a bug, or something to do with the time zones?

Here are the commands I'm running from my shell:

----------

$ date

Wed Jun 13 06:08:24 PDT 2012

$ php -r '$d=new DateTime("@1082444400"); print $d->format("r")."\n"; $d->add(new DateInterval("P1D")); print $d->format("r")."\n";'

Tue, 20 Apr 2004 07:00:00 +0000
Wed, 21 Apr 2004 08:00:00 +0000

----------

If I set the time zone on the new DataTime object to America/Los_Angeles before adding the 1 day period, then it works as expected.

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$ php -r '$d=new DateTime("@1082444400"); $d->setTimeZone(new DateTimeZone("America/Los_Angeles")); print $d->format("r")."\n"; $d->add(new DateInterval("P1D")); print $d->format("r")."\n";'

Tue, 20 Apr 2004 00:00:00 -0700
Wed, 21 Apr 2004 00:00:00 -0700

----------

Regards,
Shailesh


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