Date for the last day in the quarter that this Date is in.
assert(Date(1999, 1, 6).endOfQuarter == Date(1999, 3, 31)); assert(Date(1999, 2, 7).endOfQuarter == Date(1999, 3, 31)); assert(Date(2000, 2, 7).endOfQuarter == Date(2000, 3, 31)); assert(Date(2000, 6, 4).endOfQuarter == Date(2000, 6, 30));
See Implementation
Date for the last day in the quarter that this Date is in.