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Bug #38754 1 minute conversion error
Submitted: 2006-09-08 19:44 UTC Modified: 2006-09-08 19:48 UTC
From: mrobertson at hotmail dot com Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 5.1.6 OS: Mac OS X 10.4.7
Private report: No CVE-ID: None
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 [2006-09-08 19:44 UTC] mrobertson at hotmail dot com 
Description:
------------
There seems to be a 1 minute (3600 second) error in mktime

Reproduce code:
---------------
$onedayinsecs = 86400;
$timeS = mktime(0, 0, 0, 3, 26, 2006);
$timeS = $timeS + $onedayinsecs;
$dayS = mktime(0, 0, 0, 3, 27, 2006);
echo($timeS." - ".$dayS."<br/>");

Expected result:
----------------
The two values should be the same since we are adding 1 day in 
seconds to mktime value of 3/26/06 and getting the mktime 
value of 3/27/06.

Actual result:
--------------
1143417600 - 1143414000

The difference is 3600. Note if you start at 1/1/06 and go 
through all the days in the year totalling seconds in 
comparison to mktime this error exists between
3/27/06 and 10/29/06. From 30/10/06 the error corrects itself.

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 [2006-09-08 19:48 UTC] tony2001@php.net 
We are happy to tell you that you just discovered Daylight Savings
Time. For more information see:
http://webexhibits.org/daylightsaving/b.html
Instead of using mktime/date consider using gmmktime and gmdate which do
not suffer from DST.
 
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