DateTime / Timezone funny behaviour, between different version

Hello,

2015-11-17 11:40 GMT+01:00 Martin Keckeis martin.keckeis1@gmail.com:

Hello together,

i just noticed that the date + timezone switching changed a lot last time?

tl;dr https://3v4l.org/pSplY

When taking a old datetime:
$date = \DateTime::createFromFormat('d.m.Y H:i:s', '01.01.1900 00:00:00',
new \DateTimeZone('Europe/Berlin'));

and switching between the given timezone and UTC, the date is sometimes
corrected with some minutes+seconds and sometimes not.

$date->setTimezone(new DateTimeZone('UTC'));
// 5.6.9
// output is 1899-12-31 23:06:32.000000

// 5.6.7
1899-12-31 23:00:00.000000

5.6.15 seems to be fine again?

Anybody else have such behaviours?

Here is the new example, with the switching back to original timezone
https://3v4l.org/qdN9D

Hello together,

i just noticed that the date + timezone switching changed a lot last time?

tl;dr https://3v4l.org/pSplY

When taking a old datetime:
$date = \DateTime::createFromFormat('d.m.Y H:i:s', '01.01.1900 00:00:00',
new \DateTimeZone('Europe/Berlin'));

and switching between the given timezone and UTC, the date is sometimes
corrected with some minutes+seconds and sometimes not.

Berlin had some interesting timezone rules:

Europe/Berlin Fri Mar 31 23:06:31 1893 UT = Fri Mar 31 23:59:59 1893 LMT isdst=0 gmtoff=3208
Europe/Berlin Fri Mar 31 23:06:32 1893 UT = Sat Apr 1 00:06:32 1893 CET isdst=0 gmtoff=3600
Europe/Berlin Sun Apr 30 21:59:59 1916 UT = Sun Apr 30 22:59:59 1916 CET isdst=0 gmtoff=3600
Europe/Berlin Sun Apr 30 22:00:00 1916 UT = Mon May 1 00:00:00 1916 CEST isdst=1 gmtoff=7200

But there was a bug in PHP where we'd ignore the first block, and hence
picked a UTC offset of gmtoff=3208 for 1900-01-01, which was wrong.
That's now fixed again.

cheers,
Derick

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