Check local times and compare cities at a glance.
View all →Plan by date and explore holidays and celebrations worldwide.
View all →Follow local time and traditions to discover each city’s rhythm.
View all articles →Add calendar years, months and days with an explicit month-end policy, or add elapsed time.
Choose inputs and calculate to see your result.
Calendar mode adds years/months first, with an explicit last-valid-day or reject policy, then whole calendar days. Elapsed mode instead resolves the starting zoned instant and adds fixed hours, minutes and seconds; these operations differ across DST.
Gregorian calendar, supported years 1900–2100. Historical local calendar reforms are not modeled.
The Gregorian calendar and stated calculation policy apply. Check official rules before using results for legal deadlines.
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