Months Between Two Dates

It counts whole calendar months by matching the day of the month, not by dividing days by an average of 30.44. Whole months are subtracted first while the day number lines up, then any remaining days are reported separately. January 15 to June 15 is therefore exactly five months with no leftover days.

The final partial month is dropped because a full month has not elapsed yet. The start date is advanced by the completed months, and the leftover days are measured from that anchor to the end date. This keeps every month a true calendar month rather than a rounded average.

When advancing the start by whole months lands on a day that does not exist, the day is clamped to the last day of the target month. January 31 plus one month becomes February 28 in a common year, so January 31 to March 1 reads as one month and one day.

No. The earlier date is always treated as the start regardless of which field you fill first, so swapping the dates gives the same totals. Every result is a positive count.

Yes. The calculation uses real calendar dates, so February holds 29 days in a leap year and 28 otherwise. Any leftover-day count reflects the genuine length of the months involved.

No. Every date is treated as a plain calendar date and all math runs in UTC, so clock changes, daylight saving and your local time zone never shift the answer.

Total months is the entire gap expressed in months, such as 75. The Years and Months cards divide that same number by twelve, so 75 total months appears as 6 years and 3 months. They describe one gap two ways.

There is no practical limit. You can compare dates decades or centuries apart and the total months and the years breakdown scale accordingly. The date picker accepts standard calendar dates in YYYY-MM-DD form.

No. The calculation runs entirely in your browser, so the dates you enter are never uploaded or stored. You can use the tool offline once the page has loaded.