note 114188 added to class.dateperiod

DatePeriod is not compatible with negative intervals. To do so you can simply use DateInterval and loop through it yourself like this: (not start should be ahead of end if you use a negative interval class DateRange extends ArrayIterator { protected $oDate = null; protected $oStartDate = null; protected $oEndDate = null; protected $oInterval = null; public function __construct( DateTime $oStartDate, DateTime $oEndDate, DateInterval $oInterval = null ) { $this->oStartDate = $oStartDate; $this->oDate = clone $oStartDate; $this->oEndDate = $oEndDate; $this->oInterval = $oInterval; } public function next() { $this->oDate->add($this->oInterval); return $this->oDate; } public function current() { return $this->oDate; } public function valid() { if ($this->oStartDate > $this->oEndDate) { return $this->oDate >= $this->oEndDate; } return $this->oDate <= $this->oEndDate; } } $oRange = new DateRange(new DateTime("2013-10-01"), new DateTime("2013-01-01"), DateInterval::createFromDateString("-1 month") ); foreach ($oRange as $oDate) { echo $oDate->format("Y-m-d") . "<br />"; } ---- Server IP: 91.199.167.223 Probable Submitter: 82.148.208.233 ---- Manual Page -- http://php.net/manual/en/class.dateperiod.php Edit -- https://master.php.net/note/edit/114188 Del: integrated -- https://master.php.net/note/delete/114188/integrated Del: useless -- https://master.php.net/note/delete/114188/useless Del: bad code -- https://master.php.net/note/delete/114188/bad+code Del: spam -- https://master.php.net/note/delete/114188/spam Del: non-english -- https://master.php.net/note/delete/114188/non-english Del: in docs -- https://master.php.net/note/delete/114188/in+docs Del: other reasons-- https://master.php.net/note/delete/114188 Reject -- https://master.php.net/note/reject/114188 Search -- https://master.php.net/manage/user-notes.php