Bug #54396 [NEW]: Php appears to be one day off with Julian Day count

From: Operating system: Win7 PHP version: 5.3SVN-2011-03-26 (SVN) Package: Date/time related Bug Type: Bug Bug description:Php appears to be one day off with Julian Day count Description: ------------ I am using Xamp on Windows 7 x64 in case that is relevant. The following two sites: http://www.fourmilab.ch/documents/calendar/ http://quasar.as.utexas.edu/BillInfo/JulianDateCalc.html are in agreement. They produce a Julian Day count of 2455646.5 for 3/26/2011. However, PHP's jdtogregorian() functions produces the following: 2455646.5 => 3/25/2011 || 2455647.5 => 3/26/2011 Test script: --------------- $julianDayCntI = 2455646.5; $julianDayCntII = 2455647.5; $gregDateI = jdtogregorian($julianDayCntI); $gregDateII = jdtogregorian($julianDayCntII); echo "$julianDayCntI => $gregDateI || $julianDayCntII => $gregDateII <br />"; Expected result: ---------------- I do not have the mathematical skills to fix this bug, so I will leave correcting this bug it up to those who are more mathematically astute. -- Edit bug report at http://bugs.php.net/bug.php?id=54396&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=54396&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=54396&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=54396&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=54396&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=54396&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=54396&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=54396&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=54396&r=needscript Try newer version: http://bugs.php.net/fix.php?id=54396&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=54396&r=support Expected behavior: http://bugs.php.net/fix.php?id=54396&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=54396&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=54396&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=54396&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=54396&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=54396&r=dst IIS Stability: http://bugs.php.net/fix.php?id=54396&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=54396&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=54396&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=54396&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=54396&r=mysqlcfg