date_modify

ochojnackiATEMEgmail.com (2008-08-14 05:49:49)

$cday - specified day of the week (0-6 where 0 is Sunday)
$currentDate - date of start
$endDate - date of end

We need dates of next couple of days, that day of week  match defined.

<?php

            if($currentDate->format('w')!= $cday){
            switch ($cday){ 
            case 0 : $cdays="Sunday"; break;
            case 1 : $cdays="Monday"; break;
            case 2 : $cdays="Tuesday"; break;
            case 3 : $cdays="Wednesday"; break;
            case 4 : $cdays="Thursday"; break;
            case 5 : $cdays="Friday"; break;
            case 6 : $cdays="Saturday";
            }    
            date_modify($currentDate,"+1 {$cdays}");
            }
            
    
            while($currentDate < $endDate) {
              echo $currentDate -> format('Y-m-d H:i:s');
              $currentDate      -> modify('+1 week');
            }

?>

matthijs at yourmediafactory dot com (2007-12-08 04:38:44)

I have trouble finding the documentation for the dateTime object, but this seems to work:

<?php
$currentDate = new DateTime('2008-01-04');
$endDate     = new DateTime('2009-01-04');

while($currentDate < $endDate) {
  echo $currentDate -> format('Y-m-d') . ' till '; 
  $currentDate      -> modify('+1 week');
  echo $currentDate -> format('Y-m-d') . ' <br />';
}
?>

This will (obviously) print a list of date-ranges between startdate and enddate.

someone (2007-09-14 23:46:58)

I decided to enhance the DateTime object by taking advantage of method chaining.

<?php

class DateTimeChain extends DateTime {

    public function modify ($modify) {
        parent::modify($modify);
        return $this;
    }

    public function setDate ($year, $month, $day) {
        parent::setDate($year, $month, $day);
        return $this;
    }

    public function setISODate ($year, $week, $day = null) {
        parent:: setISODate($year, $week, $day);
        return $this;
    }

    public function setTime ($hour, $minute, $second = null) {
        parent::setTime($hour, $minute, $second);
        return $this;
    }

    public function setTimezone ($timezone) {
        parent::setTimezone($timezone);
        return $this;
    }

}

$t = new DateTimeZone('America/Los_Angeles');
$d = new DateTimeChain();
var_dump($d->setTimezone($t)->modify('5years')->format(DATE_RFC822));

?>

mike_d_olson [at] yahoo [dot] no-spam (2007-08-08 16:17:22)

I had problems with setting an existing DateTime object to an exact Unix timestamp using modify("@$timestamp"), which seems to always be relative.  So I wrote this function, which does the trick:

<?php
    function set_time(DateTime $dt, $timestamp)
    {
        $tzo = new DateTimeZone($dt->getTimezone()->getName());
        $new_dt = new DateTime("@$timestamp", new DateTimeZone('UTC'));
        $new_dt->setTimezone($tzo);
        $dt->setDate($new_dt->format('Y'), $new_dt->format('m'), $new_dt->format('d'));
        $dt->setTime($new_dt->format('H'), $new_dt->format('i'), $new_dt->format('s'));
    }
?>