Add Months to Date Calculator
Compute a date offset by months.
Add or subtract months from a date instantly. Free months calculator with year rollover.
Calculator Inputs
About Add Months
Compute a date offset by months.
Adds months; if the day overflows (Jan 31 + 1mo), clamps to month end.
Where it is used
Billing cycles, subscriptions, project milestones.
How to use the Add Months
- Date — enter the value.
- Months (positive add, negative subtract) — enter the value (e.g. 6).
- Calculate — press the Calculate button to see the result instantly above.
Formula
result = date + months (clamps overflow days).
Examples
Example
date:2026-01-31
months:1
Result: 2026-02-28 (day clamped)
Frequently Asked Questions
- Month end clamping?
- Jan 31 + 1 month = Feb 28 (or 29 in leap years).