How to write lotus script to update a field into the Calendar All Day Event

Hi

Like to know how to write lotus script to update a field into the Calendar All Day Event.

e.g. Field : DateList

   Type : Text   Editable

             Allow Multiple Values

  

   DateList : 05/06/9, 05/07/9, 05/08/9

I try the following 2 methods but is not working :

A) doc.mailCalendarDateTime = doc.DateList

B) doc.mailCalendarDateTime = Cdat(DateList)

Appreciate advice. Thxs!