Bug #73138 [NEW]: strtotime miscalculates when exiting DST with relative time

From: z dot himdi at bita dot nl Operating system: Windows 10 PHP version: 5.6.26 Package: *General Issues Bug Type: Bug Bug description:strtotime miscalculates when exiting DST with relative time Description: ------------ strtotime does not calculate correctly when adding or subtracting time relatively while exiting DST. Test script: --------------- date_default_timezone_set("Europe/Amsterdam"); echo strtotime('+ 1 second', 1477789199); // exiting DST in October, echoes 1477792800 in stead of 1477789200 echo strtotime('+ 1 second - 1 second', 1477789199); // exiting and re-entering DST, echoes 1477792799 in stead of 1477789199 echo strtotime('- 1 second', 1459040400); // exiting DST in March, echoes 1459043999 in stead of 1459040399 Expected result: ---------------- see the comments in the test script Actual result: -------------- one hour of unwanted difference -- Edit bug report at https://bugs.php.net/bug.php?id=73138&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73138&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73138&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73138&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=73138&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=73138&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=73138&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=73138&r=needscript Try newer version: https://bugs.php.net/fix.php?id=73138&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=73138&r=support Expected behavior: https://bugs.php.net/fix.php?id=73138&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=73138&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=73138&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=73138&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73138&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=73138&r=dst IIS Stability: https://bugs.php.net/fix.php?id=73138&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=73138&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=73138&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=73138&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=73138&r=mysqlcfg