Req #65608 [Opn]: Possible problems with the UNIX timestamp

Edit report at https://bugs.php.net/bug.php?id=65608&edit=1 ID: 65608 User updated by: jiri dot kapinus at gmail dot com Reported by: jiri dot kapinus at gmail dot com Summary: Possible problems with the UNIX timestamp Status: Open Type: Feature/Change Request Package: Date/time related PHP Version: Irrelevant Block user comment: N Private report: N New Comment: instead of ,,when convert this time to America/Kentucky/Monticello, it returns following date for Monticello timezone" is right this: ,,when we set the time with parametr UNIX timestamp 0, it returns UNIX timestamp start time for Monticello timezone" Previous Comments: ------------------------------------------------------------------------ [2013-09-03 08:28:49] jiri dot kapinus at gmail dot com Description: ------------ The UNIX timestamp gives the number of seconds since January 1 1970 00:00:00 UTC. But value of UNIX timestamp can be different, that in really is. More information on http://www.najdouvas.cz/unix-timestamp-error/ Test script: --------------- <?php date_default_timezone_set('UTC'); echo "Current time and date in UTC timezone: " . date("M d Y H:i:s", time()) . "<br>"; date_default_timezone_set('America/Kentucky/Monticello'); echo "Current time and date in America/Kentucky/Monticello timezone: " . date("M d Y H:i:s", time()) . "<br>"; echo "UNIX timestamp defined by Strtotime for now: " . strtotime("now") . " <br>"; $start = strtotime("now"); $zonestart = date("M d Y H:i:s", 00); echo "UNIX timestamp start at: Jan 01 1970 00:00:00 UTC<br>"; echo "when convert this time to America/Kentucky/Monticello, it returns following date for Monticello timezone<br>"; echo "UNIX timestamp start at: " . $zonestart . " America/Kentucky/Monticello timezone<br>"; echo "To this date we add UNIX timestamp for NOW time. The result may be the same as the current time and date for America/Kentucky/Monticello <br>"; $date = date_create($zonestart); $date->modify('+ ' . $start . ' sec'); echo "Result is: " . $date->format('M d Y H:i:s e') . "<br>"; date_default_timezone_set('UTC'); $date->setTimezone(new DateTimeZone("UTC")); echo "Changing this time to UTC timezone: " . $date->format('M d Y H:i:s e') . "<br><br>"; echo "When final date is not the same as the date at the begining, it means, that the UNIX timestamp don't give up exact number of second for this place or timezone. The UNIX timestamp gives the number of seconds since January 1 1970 00:00:00 UTC. But it's different for different places.<br><br>"; ?> ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=65608&edit=1