note 70988 added to function.mktime

There are several notes for mktime which use the number 86400 to differentiate two days. However this technique may pose a problem in case there is a day where the hour change between the two dates to compare. Consequently, if you want the timestamp difference between the day where the hour change and the next day, it will not be equals to 86400 but either 82800 in case its the winter change of hour day or 90000 for the summer change of hour day. For example in 2006 : <?php echo mktime(0,0,0,10,29,2006) - mktime(0,0,0,10,30,2006); // -90 000 ?> ---- Server IP: 195.221.21.36 Probable Submitter: 62.23.212.170 (proxied: 1.1 netcache-ill (NetCache NetApp/5.5R5D5)) ---- Manual Page -- http://www.php.net/manual/en/function.mktime.php Edit -- https://master.php.net/note/edit/70988 Del: integrated -- https://master.php.net/note/delete/70988/integrated Del: useless -- https://master.php.net/note/delete/70988/useless Del: bad code -- https://master.php.net/note/delete/70988/bad+code Del: spam -- https://master.php.net/note/delete/70988/spam Del: non-english -- https://master.php.net/note/delete/70988/non-english Del: in docs -- https://master.php.net/note/delete/70988/in+docs Del: other reasons-- https://master.php.net/note/delete/70988 Reject -- https://master.php.net/note/reject/70988 Search -- https://master.php.net/manage/user-notes.php