Find how many full months and years lie between two dates.
Full months count from the start date to the same day position later, subtracting one month when the end day is earlier in the month. Month counting is how billing and subscriptions accrue, so the day-adjusted total is the accurate figure.
Months Between Dates
Months between = (end year - start year) x 12 + month diff, minus one if the day hasn't arrived yet
Months between = (end year - start year) x 12 + month diff, minus one if the day hasn't arrived yet Full months count from the start date to the same day position later, subtracting one month when the end day is earlier in the month.
Month counting is how billing and subscriptions accrue, so the day-adjusted total is the accurate figure.
This calculator takes 6 inputs: Start year, Start month, Start day, End year, End month, End day. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.