/**
* Returns the timestamp for the most recent (previous) occurance of [month].
*
* @param timestamp
* @param int the month of year
* @return timestamp
*/
public static function previousMonth($ts = null, $month = sfTime::JANUARY)
{
// default to now
if ($ts === null) {
$ts = sfDateTimeToolkit::now();
}
// get offsets from january
$offset1 = date('m', $ts);
$offset2 = $month;
// adjust if date wraps into last year
$offset1 += $offset1 > $offset2 ? 0 : 12;
return sfTime::subtractMonth($ts, $offset1 - $offset2);
}
