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Re: strtotime

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El 24/08/2011 4:09, BKDotCom escribió/wrote:
> shouldn't these to both return the same timestamp?
>
> $ts = 1204351200;
> strtotime('+1 month',$ts);  	// returns 1207026000
> strtotime('@'.$ts.' +1 month'));	// returns 1207029600... where's the
> extra 1 hour coming from?

Hmmm...

date_default_timezone_set('UTC');
echo date('r e', strtotime("@1204351200")) . PHP_EOL;
echo date('r e', strtotime('+1 month', 1204351200)) . PHP_EOL;
echo date('r e', strtotime("@1204351200 +1 month")) . PHP_EOL;

date_default_timezone_set('Europe/Madrid');
echo date('r e', strtotime("@1204351200")) . PHP_EOL;
echo date('r e', strtotime('+1 month', 1204351200)) . PHP_EOL;
echo date('r e', strtotime("@1204351200 +1 month")) . PHP_EOL;

Sat, 01 Mar 2008 06:00:00 +0000 UTC
Tue, 01 Apr 2008 06:00:00 +0000 UTC
Tue, 01 Apr 2008 06:00:00 +0000 UTC
Sat, 01 Mar 2008 07:00:00 +0100 Europe/Madrid
Tue, 01 Apr 2008 07:00:00 +0200 Europe/Madrid
Tue, 01 Apr 2008 08:00:00 +0200 Europe/Madrid

This is really tricky.

My guess is that in the first form you are asking PHP to add one month 
to a given date and PHP considers the local time zone when doing date 
maths. However, in the second form PHP thinks you are defining a date as 
"1204351200 seconds and one month since Unix Epoch" and PHP disregards 
the time zone because Unix timestamps are universal.

That's probably the key point: "manipulate a date" vs "define a timestamp".


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-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
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strtotime BKDotCom <kent.brad@gmail.com> - 2011-08-23 19:09 -0700
  Re: strtotime dougatmilmacdotcom@example.com (Doug Miller) - 2011-08-24 03:09 +0000
  Re: strtotime "Álvaro G. Vicario" <alvaro.NOSPAMTHANX@demogracia.com.invalid> - 2011-08-24 09:31 +0200

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