/**
* Returns the date of the Monday of this week.
*
* This is often used as a handle on the week commencing date
*
* @param RhubarbDateTime $referenceDate The date to find the previous Monday of. Today if null.
* @return RhubarbDate
*/
public static function previousMonday($referenceDate = null)
{
if ($referenceDate == null) {
$referenceDate = new RhubarbDateTime("today");
}
$dow = $referenceDate->format("N");
$dow--;
$dow = -$dow;
$referenceDate->modify($dow . " days");
return $referenceDate;
}
