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Month Calculator

Enter the start and ending dates and the tool will calculate the exact months between them.

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Find out the exact number of months and days between two given dates using this simple month calculator. No signup or registration is required to perform the calculation.

How to Calculate the Months Between Dates

Calculating the difference in months and days is not as straightforward as it seems because not all months have the same number of days. Some months have 30 days, some have 31, and February has 28 days (or 29 days in a leap year).

By using an online month calculator, you only need to provide the start and end dates. The calculator will perform the entire calculation for you and provide accurate results effortlessly.

What Is a Leap Year?

A leap year is a calendar year that has one extra day in February. A normal year has 365 days, while a leap year has 366 days. This accounts for the fact that it takes approximately 365.25 days for the Earth to orbit the Sun. To compensate for the extra 0.25 days, one additional day is added every four years.

Formula to Calculate Number of Months

To calculate the difference between two dates, you can use the following formulas:

Step 1: Calculate the difference in years

YearDiff = Y2 - Y1

Step 2: Calculate the difference in months

MonthDiff = M2 − M1 + 12 × YearDiff

Step 3: Calculate the difference in days

DayDiff = D2 − D1

If DayDiff < 0, adjust MonthDiff by subtracting 1 and calculate the number of days in the previous month. Then add that number to DayDiff.

If this seems complicated, simply use the online month calculator. It will instantly determine the number of months and days between two dates with just a few clicks.

If you prefer to calculate months manually instead of using a calculator, the following table can help you understand the month lengths and differences.

Month Names	Number of Days	Days in a Leap Year
January	31	31
February	28	29
March	31	31
April	30	30
May	31	31
June	30	30
July	31	31
August	31	31
September	30	30
October	31	31
November	30	30
December	31	31

How Our Months Calculator Works

Use our online month calculator to find the exact number of months and days between two dates quickly and accurately. Here's how it works:

Input:

Enter the start date and end date in the designated fields.
Click on the Calculate button to perform the calculation.

Output:

The calculator will display the months and days between the two dates.

Using an online month calculator helps you save time and avoids errors in manual calculations.

FAQs

What Is the Duration of Calendar Months?

According to the Gregorian calendar, the average month length is approximately 30.436875 days.

How Do I Calculate the Remaining Months in Excel?

Use the DATEDIF function with the "ym" parameter in Excel to calculate the remaining months between two dates. For convenience, an online month calculator can also perform this calculation instantly.

How Many Months Have 31 Days?

There are seven months that have 31 days: January, March, May, July, August, October, and December.

Why Is a Month 30 or 31 Days?

Each year, the Moon completes approximately 12 cycles. The calendar was divided into twelve months, reaching 355 days. However, Romans considered even numbers unlucky, so the months’ lengths were adjusted to 29 or 31 days in the historical Pompilius calendar.

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