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Hi Rajashmita Kar,
While using Microsoft Analysis services cube as the data source, unfortunately you cannot create dates calculations, at the moment, using the “Create Calculated field” but you have to use “Create Calculated member “option.
You can find more information about this here: Microsoft Analysis Services Cube: Dates Calculation
Austin Dahl also posted some meaningful details here: Re: How to make Tableau know a field is a date and not an attribute on a MS-AS Cube
Let me know if you need further assistance
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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