MonthCalc

Months are sometimes defined, in a contract for instance, as 30 days or 31 days or 31.25 days or 365.25/12 = 30.4375 days or some other arbitrary number. This tool lets you define the length of a month and add (or subtract, if negative) that number of months to a date.

Input the length, in days, of a month.

Input the full start date, with 4-digit year.

You entered:

Enter the number of months, negative if subtracting.

Click here to calculate the resulting end day.