Umm....Q216 ends on June 30th, 2016.
Or doesn't Apple use a calendar year?
Apple's uses a fiscal year in which Q1 ends the day after Christmas. I assume there is a reason they want iPhone launches and Christmas shopping season in the first quarter, but I don't know what it is.
No, Apple doesn't use a calendar year. Apple's Fiscal year starts on the last Saturday of September at 5PM Pacific Time. Ergo their first Fiscal Quarter ends on the last Saturday of December same time, the second Fiscal Quarter ends the last Saturday of March same time, and so on.