Bug #79316 [NEW]: DateTime initiated with EST time zone behaving incorrectly

From: niklas dot lampen at supermetrics dot com Operating system: PHP version: 7.4.3 Package: Date/time related Bug Type: Bug Bug description:DateTime initiated with EST time zone behaving incorrectly Description: ------------ When initiating DateTime with time zone string 'EST', the hours are wrong, while the time zone correction is correct. When using DateTimeZone to set time zone, it works as expected. With other time zones the shorthand works correctly. Test script: --------------- echo (new DateTime('EST'))->format('c'); echo PHP_EOL; echo (new DateTime('now', new DateTimeZone('EST')))->format('c'); echo PHP_EOL . PHP_EOL; echo (new DateTime('UTC'))->format('c'); echo PHP_EOL; echo (new DateTime('now', new DateTimeZone('UTC')))->format('c'); echo PHP_EOL . PHP_EOL; echo (new DateTime('America/New_York'))->format('c'); echo PHP_EOL; echo (new DateTime('now', new DateTimeZone('America/New_York')))->format('c'); Expected result: ---------------- 2020-02-28T05:46:26-05:00 2020-02-28T05:46:26-05:00 2020-02-28T10:46:26+00:00 2020-02-28T10:46:26+00:00 2020-02-28T05:46:26-05:00 2020-02-28T05:46:26-05:00 Actual result: -------------- 2020-02-28T11:46:26-05:00 2020-02-28T05:46:26-05:00 2020-02-28T10:46:26+00:00 2020-02-28T10:46:26+00:00 2020-02-28T05:46:26-05:00 2020-02-28T05:46:26-05:00 -- Edit bug report at https://bugs.php.net/bug.php?id=79316&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=79316&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=79316&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=79316&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=79316&r=needscript Try newer version: https://bugs.php.net/fix.php?id=79316&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=79316&r=support Expected behavior: https://bugs.php.net/fix.php?id=79316&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=79316&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=79316&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=79316&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=79316&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=79316&r=dst IIS Stability: https://bugs.php.net/fix.php?id=79316&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=79316&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=79316&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=79316&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=79316&r=mysqlcfg