Account Holders and Administrators can find this information by visiting Create a test event in the DataManager Online Help and scrolling down to Step 10. 

If the Test Event Date is Set between
The Event will be scored in
August 1st and November 30thFall Norms
December 1st and February 28th (29th)Midyear (Winter) Norms
March 1st and July 31stSpring Norms