Bug #75975 [NEW]: strftime prints current timezone instead of historical

From: anton at zebooka dot com Operating system: macOS 10.13.3 PHP version: 7.1.14 Package: Date/time related Bug Type: Bug Bug description:strftime prints current timezone instead of historical Description: ------------ This function outputs incorrect timezone. Instead of outputting historical timezone for specified timestamp, it outputs current one. TZ = Asia/Novosibirsk We have changed timezone several times in Russia, Novosibirsk. We dropped DST in 26 of March 2011 and added +1 hour permanently to TZ. Then in 2014 government decided to move back to "winter time" and -1 hour from timezones. Then in summer 2016 local goverments of several states moved back to "summer time" and added +1 hour. $ zdump -v /usr/share/zoneinfo/Asia/Novosibirsk | tail -n10 /usr/share/zoneinfo/Asia/Novosibirsk Sat Oct 30 19:59:59 2010 UTC = Sun Oct 31 02:59:59 2010 +07 isdst=1 /usr/share/zoneinfo/Asia/Novosibirsk Sat Oct 30 20:00:00 2010 UTC = Sun Oct 31 02:00:00 2010 +06 isdst=0 /usr/share/zoneinfo/Asia/Novosibirsk Sat Mar 26 19:59:59 2011 UTC = Sun Mar 27 01:59:59 2011 +06 isdst=0 /usr/share/zoneinfo/Asia/Novosibirsk Sat Mar 26 20:00:00 2011 UTC = Sun Mar 27 03:00:00 2011 +07 isdst=0 /usr/share/zoneinfo/Asia/Novosibirsk Sat Oct 25 18:59:59 2014 UTC = Sun Oct 26 01:59:59 2014 +07 isdst=0 /usr/share/zoneinfo/Asia/Novosibirsk Sat Oct 25 19:00:00 2014 UTC = Sun Oct 26 01:00:00 2014 +06 isdst=0 /usr/share/zoneinfo/Asia/Novosibirsk Sat Jul 23 19:59:59 2016 UTC = Sun Jul 24 01:59:59 2016 +06 isdst=0 /usr/share/zoneinfo/Asia/Novosibirsk Sat Jul 23 20:00:00 2016 UTC = Sun Jul 24 03:00:00 2016 +07 isdst=0 /usr/share/zoneinfo/Asia/Novosibirsk Mon Jan 18 03:14:07 2038 UTC = Mon Jan 18 10:14:07 2038 +07 isdst=0 /usr/share/zoneinfo/Asia/Novosibirsk Tue Jan 19 03:14:07 2038 UTC = Tue Jan 19 10:14:07 2038 +07 isdst=0 strftime() output current +0700 TZ for historical date in 2015 year, although date() function returns correct TZ +0600. Incorrect: php > echo strftime('%Y-%m-%d %H:%M:%S %z', strtotime("2015-11-15")); 2015-11-15 00:00:00 +0700 Correct: php > echo date('Y-m-d H:i:s O', strtotime("2015-11-15")); 2015-11-15 00:00:00 +0600 Test script: --------------- echo strftime('%Y-%m-%d %H:%M:%S %z', strtotime("2015-11-15")); Expected result: ---------------- 2015-11-15 00:00:00 +0600 Actual result: -------------- 2015-11-15 00:00:00 +0700 -- Edit bug report at https://bugs.php.net/bug.php?id=75975&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75975&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75975&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75975&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75975&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75975&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75975&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75975&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75975&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75975&r=support Expected behavior: https://bugs.php.net/fix.php?id=75975&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75975&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75975&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75975&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75975&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75975&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75975&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75975&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75975&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75975&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75975&r=mysqlcfg