How to get start date of the period for a given date from cube

Question

I have a situation where i need to find the start day of the period for a given date. is there a way to know that. i want to use that in my report. i enter the date from my report(i have date parameter), depends on the date, i want to display the start day
of the period. how can i write expression for that in my report?
ram

Answer 1

Hi ramprasad74,
According to your description, you are using Analysis Services as a data source for the report, the cube has hierarchy: Fyear, FQuarter, FPeriod, fweek, Fdate. You want to add a date parameter to the report, after you changed value of the parameter, the
report will return the first day of FPeriod.
To achieve your goal, we need to add a parameter to the report, then use the parameter in mdx query. For detail information, please refer to the following steps:
In the Report Data pane, right-click on a dataset created from a SQL Server Analysis Services data source type, and then click Query. The MDX query designer opens in Design mode.
On the toolbar, click Design to toggle to Query mode.
On the MDX query designer toolbar, click Query Parameters symbol. The Query Parameters dialog box opens.
In the Parameter column, click <Enter Parameter>, and then type the name of a parameter.
In the Dimension column, choose a value from the drop-down list.
In the Hierarchy column, choose a value from the drop-down list.
In the Default column, from the drop-down list, select a single value.
Click OK. 
In query designer dialog box, type the mdx query like below:
with member [Measures].[FirstChild]
as
[Date].[Fiscal].currentmember.parent.firstchild.name
select {[Measures].[FirstChild]} on 0,
[Date].[Fiscal].[Date].members on 1
from
( SELECT ( STRTOSET(@ParameterName, CONSTRAINED) ) on 0
from
[Cube]
Here are relevant threads you can reference:
https://social.msdn.microsoft.com/forums/sqlserver/en-US/c7146ac3-40ea-4d53-b321-c707aebbd405/how-to-pass-date-parameter-to-mdx-query
https://social.msdn.microsoft.com/forums/sqlserver/en-US/fd12a865-bc90-4a65-af42-ce38a8cfa29b/pass-date-time-parameter-to-mdx-query-ssrs
If you have any more questions, please feel free to ask.
Thanks,
Wendy Fu
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