Months Between Dates Calculator
Calculate full calendar months and remaining days between two dates, with decimal months, total days, weeks, quarters and year breakdowns.
Full calendar months and remaining days
English month-difference queries usually need calendar-month logic, not a simple day count divided by 30. The same day-of-month must be reached before a full month is counted.
The remaining days are counted after the last full calendar month. Month lengths and leap years can change the result.
Month-length and reporting notes
- Full months and leftover days are the main calendar result.
- Decimal months use the average Gregorian month length of 30.4375 days.
- Quarters, weeks and total days are supporting planning values.
- Loan, lease, employment and legal terms may define months differently, so verify the governing document.
Frequently Asked Questions
Sources and References
- DateMDN Web Docs
- Representing dates and timesMDN Web Docs
- Gregorian calendarBritannica
- ISO 8601 date and time formatISO
- International System of Units: TimeNIST
Calculations are based on the listed reference sources. Links open in a new tab.
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