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Bug #44264 On some dates timezone goes wrong
Submitted: 2008-02-27 13:42 UTC Modified: 2008-03-03 22:23 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: kungla at gmail dot com Assigned:
Status: Not a bug Package: Date/time related
PHP Version: 5.2.5 OS: Win XP SP2 AND OSX Leopard
Private report: No CVE-ID: None
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 [2008-02-27 13:42 UTC] kungla at gmail dot com 
Description:
------------
On some dates timezone goes wrong. Big problem for me - can't go on whith my work!!!

Reproduce code:
---------------
$date1 = new Date('02.01.1980', new DateTimeZone('Europe/Tallinn'));
$date2 = new Date('02.01.1990', new DateTimeZone('Europe/Tallinn'));
echo $date1->format('c'). ' ' . $date2->format('c');

Expected result:
----------------
1980-01-02T00:00:00+02:00 1990-01-02T00:00:00+02:00

Actual result:
--------------
1980-01-02T00:00:00+03:00 1990-01-02T00:00:00+02:00

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 [2008-02-27 13:46 UTC] kungla at gmail dot com 
Sorry class is DateTime not Time. Same issue with date('c', giventime)
 [2008-02-27 13:56 UTC] derick@php.net 
The returned data is perfectly correct. From 1944 until 1981 Tallinn used Moscow time with Daylight Savings Time.

Europe/Tallinn  Thu Sep 21 22:00:00 1944 UTC = Fri Sep 22 01:00:00 1944 MSK isdst=0 gmtoff=10800
Europe/Tallinn  Tue Mar 31 20:59:59 1981 UTC = Tue Mar 31 23:59:59 1981 MSK isdst=0 gmtoff=10800

From 1981 to 1989 moscow timw with DST:

Europe/Tallinn  Tue Mar 31 20:59:59 1981 UTC = Tue Mar 31 23:59:59 1981 MSK isdst=0 gmtoff=10800
Europe/Tallinn  Tue Mar 31 21:00:00 1981 UTC = Wed Apr  1 01:00:00 1981 MSD isdst=1 gmtoff=14400
Europe/Tallinn  Wed Sep 30 19:59:59 1981 UTC = Wed Sep 30 23:59:59 1981 MSD isdst=1 gmtoff=14400
Europe/Tallinn  Wed Sep 30 20:00:00 1981 UTC = Wed Sep 30 23:00:00 1981 MSK isdst=0 gmtoff=10800
...
...
Europe/Tallinn  Sat Sep 24 23:00:00 1988 UTC = Sun Sep 25 02:00:00 1988 MSK isdst=0 gmtoff=10800
Europe/Tallinn  Sat Mar 25 22:59:59 1989 UTC = Sun Mar 26 01:59:59 1989 MSK isdst=0 gmtoff=10800

From 1989 until now, Estonia switched to the non-russian zone with DST:
Europe/Tallinn  Sat Mar 25 23:00:00 1989 UTC = Sun Mar 26 02:00:00 1989 EEST isdst=1 gmtoff=10800
Europe/Tallinn  Sat Sep 23 23:59:59 1989 UTC = Sun Sep 24 02:59:59 1989 EEST isdst=1 gmtoff=10800
Europe/Tallinn  Sun Sep 24 00:00:00 1989 UTC = Sun Sep 24 02:00:00 1989 EET isdst=0 gmtoff=7200
Europe/Tallinn  Sat Mar 24 23:59:59 1990 UTC = Sun Mar 25 01:59:59 1990 EET isdst=0 gmtoff=7200
Europe/Tallinn  Sun Mar 25 00:00:00 1990 UTC = Sun Mar 25 03:00:00 1990 EEST isdst=1 gmtoff=10800
...
...
Europe/Tallinn  Sun Mar 30 00:59:59 2008 UTC = Sun Mar 30 02:59:59 2008 EET isdst=0 gmtoff=7200
Europe/Tallinn  Sun Mar 30 01:00:00 2008 UTC = Sun Mar 30 04:00:00 2008 EEST isdst=1 gmtoff=10800
Europe/Tallinn  Sun Oct 26 00:59:59 2008 UTC = Sun Oct 26 03:59:59 2008 EEST isdst=1 gmtoff=10800
Europe/Tallinn  Sun Oct 26 01:00:00 2008 UTC = Sun Oct 26 03:00:00 2008 EET isdst=0 gmtoff=7200

If you are 100% sure that this data is incorrect, and you can back that up with proof, let me know.
 [2008-02-27 21:34 UTC] kungla at gmail dot com 
No I tested this on OSX leopard - same issue. I did some more examples.

Reproduce code:
---------------
<?php
date_default_timezone_set('Europe/Tallinn'); 
$date1 = new DateTime('02.01.1980', new DateTimeZone('Europe/Tallinn'));
$date2 = new DateTime('02.01.1990', new DateTimeZone('Europe/Tallinn'));

echo 'Date1<br/>';
echo $date1->format('c'). ' ' . $date1->getTimezone()->getName();
echo '<br/><br/>';
echo 'Date2<br/>';
echo $date2->format('c'). ' ' . $date2->getTimezone()->getName();
echo '<br/><br/>';
echo "date('c', strtotime('02.01.1980'))<br/>";
echo date('c', strtotime('02.01.1980'));
echo '<br/><br/>';

$date3 = new DateTime('-38 years', new DateTimeZone('Europe/Tallinn'));
echo 'Date3<br/>';
echo $date3->format('c'). ' ' . $date3->getTimezone()->getName();


echo '<br/><br/>';
date_default_timezone_set('GMT');
echo "date('c', strtotime('02.01.1980')) with date_default_timezone_set('GMT') and working<br/>";
echo date('c', strtotime('02.01.1980')); 
?>

Expected result:
----------------
Date1
1980-01-02T00:00:00+02:00 Europe/Tallinn

Date2
1990-01-02T00:00:00+02:00 Europe/Tallinn

date('c', strtotime('02.01.1980'))
1980-01-02T00:00:00+02:00

Date3
1970-02-27T23:28:00+02:00 Europe/Tallinn

date('c', strtotime('02.01.1980')) with date_default_timezone_set('GMT') and working
1980-01-02T00:00:00+00:00

Actual result:
--------------
Date1
1980-01-02T00:00:00+03:00 Europe/Tallinn

Date2
1990-01-02T00:00:00+02:00 Europe/Tallinn

date('c', strtotime('02.01.1980'))
1980-01-02T00:00:00+03:00

Date3
1970-02-27T23:28:00+03:00 Europe/Tallinn

date('c', strtotime('02.01.1980')) with date_default_timezone_set('GMT') and working
1980-01-02T00:00:00+00:00
 [2008-03-03 22:23 UTC] kungla at gmail dot com 
I found an workaround (I am creating dates from ISO_8601 ), but bug is still there!!! I see that tatus is still Bogus?
 
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