MDX: dynamic named set on cubes calculation - ssas

Question

I am trying to create a dynamic named set that can be used in slicing data using date dimension. I want to have a several named set something like last day, last 7 days, last month, last quarter and so on. For "last day" named set, i am thinking of doing something like.
StrToMember("[Date].[Calendar].[Day].&[" + DateAdd("d", -1,Tail( [Date].[Calendar].[Day], 1) + "]")
I want DateAdd("d", -1, Tail( [Date].[Calendar].[Day], 1) + "]") to return the member_value so that i can build the uniquename string to return a member, is it possible?
The reason why I am using DateAdd is that, sometimes I am having a gap in my data for Day level, so using previousmember will sometimes return a wrong data.
Ps: What I meant for the last day is not actually equal to function Now()-1, it is the last day that is available in the cube, that is why I cannot depend on the servers system time to achieve this.

Answer 1

This will hopefully give you the last day:
WITH
MEMBER [Date].[Calendar].[LastDay] AS
Tail([Date].[Calendar].[Day]).ITEM(0).ITEM(0)
SET [VariousDates] AS
{[Date].[Calendar].[LastDay]}
SELECT
[VariousDates] ON 0
FROM [MyCube]
You can then create more members in the set [VariousDates]:
WITH
MEMBER [Date].[Calendar].[LastDay] AS
Tail([Date].[Calendar].[Day]).ITEM(0).ITEM(0)
MEMBER [Date].[Calendar].[Last7Days] AS
AGGREGATE(
Tail(
[Date].[Calendar].[Day]
,7
)
)
SET [VariousDates] AS
{
[Date].[Calendar].[LastDay]
,[Date].[Calendar].[Last7Days]
}
SELECT
[VariousDates] ON 0
FROM [MyCube]
(above not tested but hopefully helps)