|Time_Member_Expression||MDX expression that returns the time dimension member.|
[Time].CurrentMember.NextStartDate for a month period will return next month start date (with time 00:00:00), for a day period will return next day start date and so on.
[Time].CurrentMember.NextStartDate will return the same result as
[Time].CurrentMember.NextMember.StartDate if the current Time member has a next member. But it is safer to use
NextStartDate as it will return the next start date also for the last Time dimension member.