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Bug #27327 Problem with 2004-03-28 (summer time conversion)
Submitted: 2004-02-20 02:53 UTC Modified: 2004-02-23 03:02 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: timo at reflection-metal dot de Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 4.3.4, 4.3.3 OS: Suse, RedHat, WinXP, W2K
Private report: No CVE-ID: None
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 [2004-02-20 02:53 UTC] timo at reflection-metal dot de 
Description:
------------
The mktime function gives strange results when adding something that results between '2004-03-28 01:00:00' and '2004-03-28 01:01:00'.

Reproduce code:
---------------
$STTDate = strToTime('2004-03-28 00:30:00');

$StrangeDate = date('Y-m-d H:i:s', mktime(date('H',$STTDate),date('i',$STTDate)+30,0,date('m',$STTDate),date('d',$STTDate),date('Y',$STTDate)));


Expected result:
----------------
2004-03-28 01:00:00

Actual result:
--------------
2004-03-28 03:00:00

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 [2004-02-20 03:41 UTC] timo at reflection-metal dot de 
Just found out that this bug is a problem with summer time conversion. You could check out e.g. 2003-03-30...
In addition:
If you subtract 1 minute from '2004-03-28 03:00:00' it results in '2004-03-28 03:59:00'
 [2004-02-20 04:16 UTC] sniper@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.
 [2004-02-21 12:14 UTC] timo at reflection-metal dot de 
Hi Sniper,
thanks for your advice... But shouldn't the daylight saving return 1 instead of 2 hours difference?
 [2004-02-21 13:03 UTC] scottmacvicar at ntlworld dot com 
Can't confirm this under RH9 and Windows XP using PHP 4.3.5RC3. There was a few timezone bug fixes could you try a snapshot from http://snaps.php.net

What timezone was your server running in? I was running them in GMT.
 [2004-02-22 22:20 UTC] sniper@php.net 
Can't reproduce with latest CVS / 4.2.3.
Check your timezone.
 [2004-02-23 03:02 UTC] timo at reflection-metal dot de 
Just tested to switch the timezone to GMT (former CET), alas same result. Also
echo gmdate('Y-m-d H:i:s', gmmktime(0, 59+1, 0, 03, 28, 2004));
is giving '2004-03-28 03:00:00'.
Reproduced this on 6 PCs and also in PHP 4.3.3.
Unfortunately I cannot try the latest snapshot, 'cause all machines are production servers. Maybe I could get some time to setup a new one during this week.
Maybe it's nothing but a guess but:
Daylight saving time outside europe starts at 01:00:00 ('cause CET is GMT+1) and inside europe 02:00:00. Could it be that they are used BOTH?
 
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