method MarkTimes.Add (Key as String, Time as Date)
Adds a MarkTime object to the collection and returns a reference to the newly created object.

TypeDescription
Key as String A String expression that specifies the key of the timer to be added. Once the newly timer is created, the Key property indicates the key of the timer.
Time as Date A DATE expression that specifies the date/time where the timers should be displayed. The Time property indicates the date/time where the timer is shown. 
ReturnDescription
MarkTimeA MarkTime object being created.
The Add method of MarkTimes collection adds a new timer to the schedule view. The Time property indicates the date/time where the timer is shown. The MarkTimes collection is accessible through the MarkTimes property of the control. The ShowMarkTime property indicates whether the schedule view displays timers. The AllowMoveMarkTime property indicates the keys to allow user to move timers ( with the Movable property on True ). The MarkTimeFromPoint property indicates the timer from the cursor. 

The MarkTime object, also called timer, can be used to:

The following screen shot shows the control's timers ( red and black/blue arrow ):