Bug #73460 [Com]: Datetime add not realising it already applied DST change
Edit report at https://bugs.php.net/bug.php?id=73460&edit=1
ID: 73460
Comment by: fyrye3 at gmail dot com
Reported by: saulyx at gmail dot com
Summary: Datetime add not realising it already applied DST
change
Status: Open
Type: Bug
Package: Date/time related
Operating System: FreeBSD
PHP Version: 5.6Git-2016-11-04 (Git)
Block user comment: N
Private report: N
New Comment:
Corrections to my previous comment
Example https://3v4l.org/lUaT9
Expected
-----------------------
2006-04-02 03:00 EDT
2006-04-02 01:00 EST
---
2006-10-29 01:00 EDT
2006-10-29 01:30 EDT
2006-10-29 01:00 EST
2006-10-29 01:30 EST
2006-10-29 02:00 EST
2006-10-29 02:30 EST
2006-10-29 03:00 EST
Previous Comments:
------------------------------------------------------------------------
[2019-03-22 21:56:05] fyrye3 at gmail dot com
The same endless loop issue can also be seen with DateTime::sub() when DST starts.
Example demonstrating both issues: https://3v4l.org/ZNfgq
---
<?php
date_default_timezone_set('America/New_York');
//DST starts Apr. 2nd 02:00 and moves to 03:00
$start = new \DateTime('2006-04-02T01:00:00');
$end = new \DateTime('2006-04-02T04:00:00');
while($end > $start) {
$now = clone $end;
$end->sub(new \DateInterval('PT1H'));
echo $end->format('Y-m-d H:i T') . PHP_EOL;
if ($now == $end) {
break; //remove this will result in an endless loop
}
}
echo '-----' . \PHP_EOL;
//DST ends Oct. 29th 02:00 and moves to 01:00
$start = new \DateTime('2006-10-29T00:30:00');
$end = new \DateTime('2006-10-29T03:00:00');
$i = 0;
while($end > $start) {
$now = clone $start;
$start->add(new \DateInterval('PT30M'));
echo $start->format('Y-m-d H:i T') . PHP_EOL;
if ($i++ > 7) {
break; //remove this will result in an endless loop
}
}
?>
Received
-----------------------
2006-04-02 03:00 EDT
2006-04-02 03:00 EDT
-----
2006-10-29 00:30 EDT
2006-10-29 01:00 EDT
2006-10-29 01:30 EDT
2006-10-29 01:00 EST
2006-10-29 01:30 EDT
2006-10-29 01:00 EST
2006-10-29 01:30 EDT
2006-10-29 01:00 EST
2006-10-29 01:30 EDT
Expected
-----------------------
2006-04-02 03:00 EDT
2006-04-02 01:00 EST
---
2006-10-29 00:30 EDT
2006-10-29 01:00 EDT
2006-10-29 01:30 EDT
2006-10-29 01:00 EST
2006-10-29 01:30 EST
2006-10-29 02:00 EST
------------------------------------------------------------------------
[2016-11-04 15:25:07] saulyx at gmail dot com
Description:
------------
PHP seems to run into an infinite loop when add() is run and it adjusts to the DST change, but when
it arrives at the time again, it reset back an hour for infinite amount of times.
Test script:
---------------
$date = new DateTime('2016-11-05 22:00:00', new
DateTimeZone('America/New_York'));
foreach(range(1,48) as $i) {
echo $date->format('Y/m/d H:i')."<br/>";
$date->add(new DateInterval('PT15M'));
}
Actual result:
--------------
2016/11/05 22:00
2016/11/05 22:15
2016/11/05 22:30
2016/11/05 22:45
2016/11/05 23:00
2016/11/05 23:15
2016/11/05 23:30
2016/11/05 23:45
2016/11/06 00:00
2016/11/06 00:15
2016/11/06 00:30
2016/11/06 00:45
2016/11/06 01:00
2016/11/06 01:15
2016/11/06 01:30
2016/11/06 01:45
2016/11/06 01:00
2016/11/06 01:15
2016/11/06 01:30
2016/11/06 01:45
2016/11/06 01:00
2016/11/06 01:15
2016/11/06 01:30
2016/11/06 01:45
2016/11/06 01:00
2016/11/06 01:15
2016/11/06 01:30
2016/11/06 01:45
2016/11/06 01:00
2016/11/06 01:15
2016/11/06 01:30
2016/11/06 01:45
2016/11/06 01:00
2016/11/06 01:15
2016/11/06 01:30
2016/11/06 01:45
2016/11/06 01:00
2016/11/06 01:15
2016/11/06 01:30
2016/11/06 01:45
2016/11/06 01:00
2016/11/06 01:15
2016/11/06 01:30
2016/11/06 01:45
2016/11/06 01:00
2016/11/06 01:15
2016/11/06 01:30
2016/11/06 01:45
------------------------------------------------------------------------
--
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