Calculate quarter

Identify the calendar quarter and its exact UTC start and end dates.

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ToolQuarter Calculator
Input
Output
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Preview

How it works

The UTC month index is split into four consecutive three-month groups, beginning with January through March as Q1. Boundaries are the first UTC day of the first month and final UTC day of the third month.

  • Only calendar quarters are calculated.
  • An organisation’s fiscal-year start is not inferred.

Worked example

Find Quarter for Date
Determine which fiscal quarter August 15 falls in
Input
											2025-08-15
Output
												Date: 2025-08-15
Quarter: Q3 2025
Start: 2025-07-01
End: 2025-09-30

When to use this

Calendar-year sales reports group April invoices into Q2, analytics filters build UTC quarter boundaries, and filing checklists label October dates as calendar Q4.

Edge cases

  • A company whose fiscal year begins in April calls April its first fiscal quarter, but this result is calendar Q2.
  • A timestamp near local midnight is classified by its UTC month, which can differ from its local date.
  • Invalid calendar strings are rejected instead of inheriting the current quarter.