Calculate Months Between Two Dates |link| May 2026

Most calculators do not count the end date. If you need to include both the first and last day (e.g., for a rental period), you typically need to add 1 to your final result.

The native Date object can be used, but many developers prefer date-fns for its dedicated differenceInMonths function, which provides consistent results across browsers. 4. Critical Edge Cases to Watch calculate months between two dates

If you need to know exactly how many months have passed, including partial months (e.g., 2.5 months), use YEARFRAC . =YEARFRAC(start_date, end_date) * 12 Most calculators do not count the end date

Spreadsheets offer built-in functions that handle these calculations automatically, including "hidden" functions specifically for dates. The DATEDIF Function (Best for Full Months) The DATEDIF Function (Best for Full Months) For

For a quick, one-off calculation without formulas, you can use the Month Counter on Omni Calculator or the Time and Date Duration Calculator to get an instant breakdown in months, weeks, and days.

Calculating the difference between January 31 and February 28 can produce different results depending on the tool. Some tools consider this a full month, while others see it as 28 days.

The datetime module is standard, but the dateutil library is often preferred for its relativedelta function, which handles month rollovers natively.