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Periods, dates and frequencies
Months, quarters and years in one notation, and how ranges work.
Guide
Form
Means
2026-08
August 2026
2026-Q2
April to June 2026
2026
The calendar year 2026
2026-10-12
A day (holidays and exchange rates)
from and to are inclusive. A quarter ends in its last month and a year ends in December, so a year that has not finished is never treated as newer than a finished month. Timestamps are UTC.
