Date Offset Calculator
Move a date by any span, in either direction
One field for the whole offset — `2y 3mo 10d`, `+6 weeks`, `-90 days` — applied in calendar order, with each step shown so you can see what happened.
Questions people ask
The things that come up about date offset calculators, answered plainly.
Does the order of the units matter?
Yes, and it is why the steps are shown. Years and months are applied first, then days — applying them the other way round gives a different answer whenever clamping is involved. This is the order every calendar system uses.
What can I type in the offset field?
Compound spans like `1y 2mo 3d 4h`, plain forms like `90 days` or `-6 weeks`, and ISO 8601 durations like `P1Y2M3D` or `PT90M`.
Related tools
Move a date forwards or backwards by a span, with the calendar's rules applied.
Time Offset CalculatorHours, minutes and seconds applied to an instant, with the resulting timestamp, the date rollover, and any daylight-saving transition the span crossed.
Add Days to DateAdd any number of days to a date and get the answer with its weekday, plus the same date counted in working days for anything with a deadline attached.
Future Date CalculatorCount forward from today by any span and get the date, its weekday, its week number, and how many working days away it is.
Duration CalculatorA duration in every unit from nanoseconds to decades, with the approximate ones flagged as approximate — because a month has no fixed length and any tool that pretends otherwise is guessing.