Valid values are MO, TU, WE, TH, FR, SA and SU.
This is significant when a WEEKLY RRULE has an interval greater than 1,
and a BYDAY rule part is specified.
This is also significant when in a YEARLY RRULE when a BYWEEKNO rule
is specified. The default value is MO.
public setWeekStart ( string $weekStart ) | ||
$weekStart | string | The day on which the workweek starts. |