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Bug #13590 unix timestamp arithmetic has anomally
Submitted: 2001-10-07 19:05 UTC Modified: 2001-10-07 21:23 UTC
From: spedding at met dot co dot nz Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 4.0.4pl1 OS: NT2000/(+Redhat)
Private report: No CVE-ID: None
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From: spedding at met dot co dot nz
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 [2001-10-07 19:05 UTC] spedding at met dot co dot nz
creating a unix timestamp for a date with zero hours / minutes, and then adding time of day as seconds gives wrong result.

snippet from my code
________________________
        echo ("\n<!-- before hms ".strftime ("%b %d %Y %H:%M:%S", $dateAndTime)."-->\n");
        $dateAndTime += 7200;
        echo ("\n<!-- before DST ".strftime ("%b %d %Y %H:%M:%S", $dateAndTime)."-->\n");
________________________
example outputs

timestamp before arithmetic
<!-- before hms Oct 07 2001 00:00:00-->

after adding 7199 (ie 01:59)
<!-- before DST Oct 07 2001 01:59:59-->

after adding 7200 (ie 02:00)
<!-- before DST Oct 07 2001 03:00:00-->

only seems to happen for this transition between 1:59 and 2:00 , after that the 1 hour error is consistent.

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 [2001-10-07 20:52 UTC] spedding at met dot co dot nz
daylight saving confusion!
 [2001-10-07 21:23 UTC] mfischer@php.net
Hehe ;) Beats us every then and now.

Bogusified.

- Markus
 
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