Work out quarter dates instantly with clear inputs, formula shown and shareable results.
Quarters are three-month blocks counted from the fiscal year start. On a calendar basis Q3 2026 runs 1 July to 30 September - 92 days containing 66 working days. Quarters are unequal in length, from 90 days in Q1 of a common year to 92 in Q3, which matters when comparing quarterly revenue.
Quarter start
start month = fiscal start + 3 x (quarter - 1)
Quarter end
the day before the start of the following quarter
No. Q1 has 90 or 91 days while Q2, Q3 and Q4 have 91 or 92, so like-for-like revenue comparisons should normalise per day.
Because they follow their own fiscal year. A company with an April year end has its Q1 running April to June.