how to get min or max date on columns in mdx query - date

Question

what mdx query logic could i implement for this example to get two rows in result set for hrid = 1 with 1/1/16 as min date(start) for first row where someattribut shows up on column with value 'A'
and 1/15/16 as min date(start) for second row where someattribute has value of 'B' and measure.whatevers has its aggregation for whatever data corresponds to that dimension row.
Im trying to just look at january 2016
everything ive tried i seem to get min date values of 1/1/1900 or both rows have value of 1/1/2016 or i get errors since i cant figure it out.
heres my mdx sample:
WITH MEMBER [Measures].[Start] as
(
-- min date that the combination of someattribute and hrid have certain
-- value withing the range of the where clause restriction of january 2016
SELECT {
[Measures].[Start]
, [Measures].[Whatevers]
} ON COLUMNS
, NON EMPTY {
[Agent].[HRID].children
* [Agent].[someAtribute].Members
} ON ROWS
FROM [RADM_REPORTING]
WHERE (
[Date].[Date View].[Month].&[201601]
)

Answer 1

this works, but it feels kind of like a hack or maybe it feels like its not robust, I am not familiar enough with mdx to be able to make that call.
WITH MEMBER [Measures].[Start] as
filter([Date].[Date View].[Month].&[201601].children,
[Measures].[Whatevers]).item(0).membervalue

Answer 2

Here is a potential direction that is more general:
WITH
MEMBER [Measures].[Start] AS
Min
(
(EXISTING
[Date].[Date].[Date].MEMBERS)
,IIF
(
[Measures].[Internet Sales Amount] = 0
,NULL
,[Date].[Date].CurrentMember.MemberValue
)
)
SELECT
NON EMPTY
{
[Measures].[Start]
,[Measures].[Internet Sales Amount]
} ON COLUMNS
,NON EMPTY
[Product].[Product Categories].[Product] ON ROWS
FROM [Adventure Works]
WHERE
[Date].[Calendar].[Calendar Year].&[2005];
It gives the following: