note 50253 added to ref.calendar

quisiera saber si alguien sabe un codigo que me de la fecha del dia anterior de una fecha . el problema lo tengo cuando en la fecha el dia es uno .. i need a example of the calculation of the (yesterday) date when you have a date whit a day one(1) 2001/06/01 --- yesterday is??? ---- Manual Page -- http://www.php.net/manual/en/ref.calendar.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+50253 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+50253&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+50253&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+50253&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+50253&report=yes&reason=useless Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+50253&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+50253&report=yes Search -- http://master.php.net/manage/user-notes.php