Months Between Dates Calculator
Calculate the number of complete calendar months between two dates.
Calculator
Results
How it works
Calculate the number of complete calendar months between two dates.
Example
| Example | Result |
|---|---|
| Jan 15 to Jul 15, 2026 | 6 complete months. |
Important notes
- Calendar calculations use Gregorian calendar rules.
- Business-day calculations exclude Saturday and Sunday unless stated otherwise.
- Time-zone calculations depend on the browser's IANA time-zone data.
- For planning purposes, verify dates and times when a contractual or legal deadline is involved.
Frequently Asked Questions
Are months treated as fixed numbers of days?
No. This uses calendar-month boundaries and anniversaries.
What happens when a day does not exist in the target month?
Month-end dates are clamped to the last valid day.
How to use this calculator
What to enter
Enter or select the following as requested: Start date; End date. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The date or duration result is calculated from the entered dates, times, calendar rules, and exclusions. Check inclusive versus exclusive counting, time zone, daylight-saving changes, and whether weekends or holidays are excluded.
When to use it
Use this to plan a date, measure elapsed time, or estimate a deadline. Verify the relevant calendar, location, and legal or workplace rules when they affect the answer.