note 116949 added to function.mktime

Pay attention that not all days have the same number of seconds (86400s) if you are using date_default_timezone_set(..) and the used timezone has Daylight Saving Time (DST) e.g. "Europe/Berlin". Under PHP 5.5.16 I get the following results: $shortday = mktime(23,59,59, '3','29','2015') - mktime(0,0,0, '3','29','2015) + 1; // result: 82800s (86400s - 3600s) $normalDay = mktime(23,59,59, '1', '2','2015') - mktime(0,0,0, '1', '1','2015) + 1; // result: 86400s $longDay = mktime(23,59,59,'10','25','2015') - mktime(0,0,0,'10','25','2015) + 1; // result: 90000s (86400s + 3600s) Pitfall is noticeable if you are running an iterative loop with a code like: echo date( 'd.m.Y', $day ); $day = $day + 86400; // 86400 = 24*3600 - frequently used in PHP code which results in wrong date if $day reaches 2015-10-25 (end of summer time in Germany): 24.10.2015 25.10.2015 25.10.2015 // Ups! Same date twice in calendar 27.10.2015 You may workaround this by using date_default_timezone_set('UTC') where all days have the same number of seconds. ---- Server IP: 72.52.91.14 Probable Submitter: 87.174.149.64 ---- Manual Page -- http://php.net/manual/en/function.mktime.php Edit -- https://master.php.net/note/edit/116949 Del: integrated -- https://master.php.net/note/delete/116949/integrated Del: useless -- https://master.php.net/note/delete/116949/useless Del: bad code -- https://master.php.net/note/delete/116949/bad+code Del: spam -- https://master.php.net/note/delete/116949/spam Del: non-english -- https://master.php.net/note/delete/116949/non-english Del: in docs -- https://master.php.net/note/delete/116949/in+docs Del: other reasons-- https://master.php.net/note/delete/116949 Reject -- https://master.php.net/note/reject/116949 Search -- https://master.php.net/manage/user-notes.php