When creating a section, you can define an As of date.
To define the As of date column:
In Interactive Reporting Studio:
On the Request line of a query, create and name a computed item; for example, Query Date.
Double-click the item on the Request line; for example, now(Query Date), to display Item Properties.
Click Options to display the Datatype drop-down list.
Ensure that the column data type is Date, DateTime, or TimeStamp.
In Item Properties, click OK to return to the section.
Click File, then Save to save the As of date.
See Step 7: Configure Properties, to set the properties of the As of date column.