/**
* Returns the timestamp for the most recent (previous) occurance of [day].
*
* @param timestamp
* @param int the day of week
* @return timestamp
*/
public static function previousDay($ts = null, $day = sfTime::SUNDAY)
{
// default to now
if ($ts === null) {
$ts = sfDateTimeToolkit::now();
}
// get offsets from sunday
$offset1 = date('w', $ts);
$offset2 = $day;
// adjust if date wraps into last week
$offset1 += $offset1 > $offset2 ? 0 : 7;
return sfTime::subtractDay($ts, $offset1 - $offset2);
}
