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Add or subtract days, weeks, months, or years with calendar-aware results
Calculation guide
Days and weeks move by fixed calendar-day counts. Months and years use calendar boundaries, so month-end dates are clamped to the final valid day when the target month is shorter.
Result date = start date +/- selected calendar amountSeven days and one week are equivalent, but 30 days and one month are not always the same date.
Adding one month to January 31 returns the final day of February rather than overflowing into March.
The result includes the full calendar date, day of the week, and its distance from today.
Worked example
February 2026 has 28 days, so January 31 cannot be preserved exactly in the target month.
The calendar-aware result is February 28, 2026, a Saturday.Yes. Native calendar rules are used, including February 29 in leap years.
The result is clamped to the target month's final valid day. For example, January 31 plus one month becomes February 28 in 2026.
Not always. Calendar months contain 28, 29, 30, or 31 days, while a 30-day offset always moves exactly 30 calendar days.
Yes. Choose subtract and enter days, weeks, months, or years to find the earlier date.
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