Bug #54005 [Opn->Bgs]: mktime() changes days when it should't

Edit report at http://bugs.php.net/bug.php?id=54005&edit=1 ID: 54005 Updated by: derick@php.net Reported by: taxi at a-city dot de Summary: mktime() changes days when it should't -Status: Open +Status: Bogus Type: Bug Package: Date/time related Operating System: Linux (Debian) PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. I've no idea what you're doing with the 3rd argument to mktime(). You're passing in Unix timestamps, but with an hour of 1? There is going to be some DST issues with this at least. Please don't abuse functions like this. Previous Comments: ------------------------------------------------------------------------ [2011-02-13 15:47:43] taxi at a-city dot de Description: ------------ Hi, I'm trying to use mktime() to calculate when one month is over. As you can see the day changed at february (which wa fixed by a quick&dirty-really-bad-hack) and May (more untested). I think the problem with february is that mktime() doesn't know that february only has 28 days? Test script: --------------- <? $now = time(); $a = mktime(1, 0, $now, 1, 1, 1970); $b = mktime(1, 0, $now, 1 + 1, 1, 1970); $c = mktime(1, 0, $now, 1, 1 + 28, 1970); //28 days couse this month has only $ $d = mktime(1, 0, $now, 1 + 1, 1 + 28, 1970); $e = mktime(1, 0, $now, 1 + 2, 1 + 28, 1970); $f = mktime(1, 0, $now, 1 + 3, 1 + 28, 1970); $g = mktime(1, 0, $now, 1 + 4, 1 + 28, 1970); $h = mktime(1, 0, $now, 1 + 5, 1 + 28, 1970); echo "Now: $now (".date("d.m.Y",$now).")<br> a: $a (".date("d.m.Y",$a).")<br> b: $b (".date("d.m.Y",$b).")<br> c: $c (".date("d.m.Y",$c).")<br> d: $d (".date("d.m.Y",$d).")<br> e: $e (".date("d.m.Y",$e).")<br> f: $f (".date("d.m.Y",$f).")<br> g: $g (".date("d.m.Y",$g).")<br> h: $h (".date("d.m.Y",$h).")"; ?> Expected result: ---------------- Now: 1297608181 (13.02.2011) a: 1297608181 (13.02.2011) b: 1300286581 (13.03.2011) c: 1300027381 (10.03.2011) d: 1302702181 (13.04.2011) e: 1305121381 (13.05.2011) f: 1307799781 (13.06.2011) g: 1310391781 (13.07.2011) h: 1313070181 (13.08.2011) Actual result: -------------- Now: 1297608181 (13.02.2011) a: 1297608181 (13.02.2011) b: 1300286581 (16.03.2011) c: 1300027381 (13.03.2011) d: 1302702181 (13.04.2011) e: 1305121381 (11.05.2011) f: 1307799781 (11.06.2011) g: 1310391781 (11.07.2011) h: 1313070181 (11.08.2011) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=54005&edit=1