First quarter, Q1: 1 January – 31 March (90 days or 91 days in leap years) Second quarter, Q2: 1 April – 30 June (91 days) Third quarter, Q3: 1 July – 30 September (92 days)

What is Q1 Q2 Q3 Q4?

January, February, and March (Q1) April, May, and June (Q2) July, August, and September (Q3) October, November, and December (Q4)

What is a quarter ending?

The "end of the quarter" refers to the conclusion of one of four specific three-month periods on the financial calendar. The four quarters end in March, or Q1; June, or Q2; September, or Q3; and December, or Q4.