
Explanation:
MONTH 3
="Qtr " & ROUNDUP(MONTH([Date])/3,0)
="Qtr " & ROUNDUP(MONTH([Date])/3,0)
http://www.decisivedata.net/blog/quickly-create-week-month-quarter-and-year-fields-from-a-date-using-dax
http://www.decisivedata.net/blog/quickly-create-week-month-quarter-and-year-fields-from-a-date-using-dax