Date & Time calculator
Month Counter - Count Months Between Dates
Count completed calendar months and remaining days between two dates, plus an approximate month total.
FormulaCompleted months = full calendar years x 12 + full remaining months; extra days are counted after the last full month
Formula
Month count method
Contracts, billing systems, finance products, and HR policies may define months differently. Verify the applicable rule before relying on the result.
Completed months = full calendar years x 12 + full remaining months; extra days are counted after the last full month
From 2026-01-15 to 2026-07-14 is 5 completed months and 29 remaining days.
FAQ7 common questions for this calculator.
FAQs
Why show completed months and approximate months?+
Completed months follow calendar boundaries, while approximate months divide days by the average Gregorian month length.
Does it handle month-end dates?+
Yes. Month additions are clamped so dates such as January 31 compare sensibly with shorter months.
Can I count backward?+
Yes. Enter dates in either order; the calculator shows the absolute calendar month difference.
How does the Month Counter calculate the result?+
For the Month Counter, it uses the Month count method: Completed months = full calendar years x 12 + full remaining months; extra days are counted after the last full month. From 2026-01-15 to 2026-07-14 is 5 completed months and 29 remaining days.
What information do I need to use the Month Counter?+
For the Month Counter, enter the relevant dates, times, timezone, or calendar settings requested by the form. Exact dates matter because month lengths, leap years, and boundary days can change the result.
How accurate is the Month Counter?+
Month Counter is accurate for the values and assumptions entered on this page. It uses the Month count method. Recheck the inputs before relying on the estimate.
What should I check before using the Month Counter result?+
For the Month Counter, check the date and time fields, date format, timezone, daylight-saving changes, inclusive or exclusive endpoints, and whether weekends or holidays should count.
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Date & Time guide
How to use the Month Counter
Count completed calendar months and remaining days between two dates, plus an approximate month total. The page also explains the month count method and shows a practical example: From 2026-01-15 to 2026-07-14 is 5 completed months and 29 remaining days.
- 1
Enter your details
Enter the values for the month counter scenario you want to check.
- 2
Check the calculation
Review the result alongside the month count method: Completed months = full calendar years x 12 + full remaining months; extra days are counted after the last full month.
- 3
Compare scenarios
Change one or more inputs to see how they affect the month Counter result before you use the estimate.