Does every organization use these quarter boundaries?

No, many organizations use a fiscal year starting in a different month. This engine covers only the standard calendar-year quarters.

Quarter Start / End Calculator

Find which standard calendar quarter a date falls in, and that quarter's start and end dates.

Need a fiscal year that doesn't start in January? See Fiscal Quarter Calculator.

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Worked example

May 15, 2027 falls in Q2, which runs April 1 through June 30, 2027. Standard calendar quarters split the year into three-month blocks starting January, April, July, and October. October 1, 2027 falls in Q4, which runs through December 31, 2027, since Q4 is the final block and always ends on the last day of the calendar year.

Common mistakes

Assuming every organization uses these same quarter boundaries. Many run a fiscal year starting in a different month, so their "Q1" can cover a completely different three months than the standard calendar Q1 does.
Miscounting which quarter a boundary date falls in. The last day of a quarter, such as June 30, still belongs to that quarter, not the one that starts the next day, which is an easy off-by-one to make near a quarter boundary.

Limitations

This uses the standard calendar quarter definition. It does not reflect a fiscal year that starts in a different month, so a business quarter should be checked against Fiscal Quarter Calculator instead when the two do not match.

Frequently asked questions

Does every organization use these quarter boundaries?: No, many organizations use a fiscal year starting in a different month. This engine covers only the standard calendar-year quarters.