Bug #79716 [NEW]: Invalid date time created (with day "00")

From: a dot schilder at gmx dot de Operating system: Windows 10 PHP version: 7.4.7 Package: Date/time related Bug Type: Bug Bug description:Invalid date time created (with day "00") Description: ------------ Situation: I'm doing some datetiem calculations. I have a start date time and calculate following dates based on recurrence rules. This means I add date intervals to the start date time value until a specific date time or number of results. Depending on the rule the date can be hundreds oy years in the future. Error: From time to time I got an error when trying to get the number of days in month of the resulting date time. The value I got was "0" (which isn't documented, because it shouldn't be possible). When I dum the object, the internal date time value is set to the invalid date "2770-01-00 15:00:00.000000". I can't say how it came to the result, because there were too many date intervals added to the start date time, but it's easy to reproduced by creating a date time instance directly with this wrong time value. Reproduced in the following PHP Versions: 7.2.2, 7.4.2, 7.4.7, 8.0.0-dev Test script: --------------- <?php $datetime = new \DateTimeImmutable( '2770-01-00 15:00:00.000000', new \DateTimeZone('UTC') ); \var_dump($datetime->format('j') === '0'); \var_dump($datetime); Expected result: ---------------- bool(false) object(DateTimeImmutable)#3 (3) { ["date"]=> string(26) "2769-12-31 15:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } Actual result: -------------- bool(true) object(DateTimeImmutable)#3 (3) { ["date"]=> string(26) "2770-01-00 15:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" } -- Edit bug report at https://bugs.php.net/bug.php?id=79716&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=79716&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=79716&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=79716&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=79716&r=needscript Try newer version: https://bugs.php.net/fix.php?id=79716&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=79716&r=support Expected behavior: https://bugs.php.net/fix.php?id=79716&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=79716&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=79716&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=79716&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=79716&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=79716&r=dst IIS Stability: https://bugs.php.net/fix.php?id=79716&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=79716&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=79716&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=79716&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=79716&r=mysqlcfg