Bug #80748 [NEW]: DateInterval wrongly counts DateTime->diff days

From: palansher at outlook dot com Operating system: ubuntu 18.04 PHP version: Irrelevant Package: Date/time related Bug Type: Bug Bug description:DateInterval wrongly counts DateTime->diff days Description: ------------ DateTime->diff returns different days, depending on how many seconds passed from midnight on a target date. This behaviour is independent of timezone settings. Tested on PHP 7.2-7.4 The bug doesn't appear if you use short period: <?php $beforDate=DateTime::createFromFormat('Y-m-d G:i:s', '1900-01-01 00:00:00'); $afterDate=DateTime::createFromFormat('Y-m-d G:i:s', '1900-01-08 00:00:43'); $dtInterval = $beforDate->diff($afterDate); $daysPassed = $dtInterval->days; echo "days passed if target date have 42 seconds from midnight: $daysPassed" . PHP_EOL; $afterDate=DateTime::createFromFormat('Y-m-d G:i:s', '1900-01-08 00:00:43'); $dtInterval = $beforDate->diff($afterDate); $daysPassed = $dtInterval->days; echo "days passed if target date have 43 seconds from midnight: $daysPassed" . PHP_EOL; Test script: --------------- <?php $beforDate=DateTime::createFromFormat('Y-m-d G:i:s', '1900-01-01 00:00:00'); $afterDate=DateTime::createFromFormat('Y-m-d G:i:s', '2021-01-08 00:00:42'); $dtInterval = $beforDate->diff($afterDate); $daysPassed = $dtInterval->days; echo "days passed if target date have 42 seconds from midnight: $daysPassed" . PHP_EOL; $afterDate=DateTime::createFromFormat('Y-m-d G:i:s', '2021-01-08 00:00:43'); $dtInterval = $beforDate->diff($afterDate); $daysPassed = $dtInterval->days; echo "days passed if target date have 43 seconds from midnight: $daysPassed" . PHP_EOL; Expected result: ---------------- days passed: 44201 Actual result: -------------- days passed: 44202 -- Edit bug report at https://bugs.php.net/bug.php?id=80748&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=80748&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=80748&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=80748&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=80748&r=needscript Try newer version: https://bugs.php.net/fix.php?id=80748&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=80748&r=support Expected behavior: https://bugs.php.net/fix.php?id=80748&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=80748&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=80748&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=80748&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=80748&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=80748&r=dst IIS Stability: https://bugs.php.net/fix.php?id=80748&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=80748&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=80748&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=80748&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=80748&r=mysqlcfg