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Bug #7518 Rounding problems with mktime() or date()
Submitted: 2000-10-29 05:56 UTC Modified: 2000-10-29 09:03 UTC
From: sascha at mantscheff dot net Assigned:
Status: Closed Package: Date/time related
PHP Version: 4.0.1pl2 OS: SuSE Linux 6.4
Private report: No CVE-ID: None
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From: sascha at mantscheff dot net
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 [2000-10-29 05:56 UTC] sascha at mantscheff dot net 
<?php
        $DAYS = 3600 * 24;
        $fdom = mktime( 0, 0, 0, 10, 8, 2000 );
        for ($i = 1; $i < 30; $i++)
                echo date( "d.m.Y", $fdom + ($i - 1) * $DAYS ) . " ";
?>

This script should list the day number from October, 08th, through the next 30 days. It repeats the 29th day of October. I don't know why.

If the 3rd line is changed to
        $fdom = mktime( 0, 0, 0, 10, 08, 2000 );
date counting starts on September 30th, so the leading 0 of "08" is misinterpreted as a standalone zero.

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 [2000-10-29 09:03 UTC] jah@php.net 
There was switch to daylight saving on your timezone, so
the difference between 2000-10-29 00:00:00 and 2000-10-30 00:00:00 is 90000 seconds, not 86400. Always some other
time, for example 12:00:00, which will fall on the right
date even when there is 23 or 25 hours in day and you go
forward in steps of 86400 seconds.

In your second example, numbers beginning with a leading
zero are *octal* numbers, and 08 is a non-existent octal
number.
 
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