how many months at the end of the second quarter
The calendar year can be divided into four quarters, often abbreviated as Q1, Q2, Q3, and Q4. 1  First quarter, Q1: 1 January â 31 March (90 days or 91 days in leap years) 2  Second quarter, Q2: 1 April â 30 June (91 days)  Third quarter, Q3: 1 July â 30 September (92 days)