How to calculate number of days in a month or a year in Excel?

As we all know, there are leap years and common years where leap year has 366 days and common year has 365 days. To calculate the number of days in a month or a year based on a date, this article will help you.

Calculate number of days in a given month with formulas

Calculate number of days in a given year with formulas


arrow blue right bubble Calculate number of days in a given month with formulas


If you have a list of date in a column, to calculate the days in a month, please apply the following formulas:

Enter this formula: =DAY(DATE(YEAR(A2),MONTH(A2)+1,1)-1) into a blank cell beside your date, and then drag the fill handle down to the cells that you want to calculate the days in the specific month, see screenshot:

doc calculate days in month 1

Notes:

1. Another formula also can help you to calculate the days in a month, please apply this formula: =DAY(EOMONTH(A2,0)).

2. In the above formulas, A2 is the date cell that you want to get the number of days in a month based on.


arrow blue right bubble Calculate number of days in a given year with formulas

To get the number of days in a year, please do as this:

Enter this formula: =DATE(YEAR(A2),12,31)-DATE(YEAR(A2),1,1)+1 into a blank cell beside your date cell, then drag the fill handle down to the cells that you want to calculate the days in the specific year, see screenshot:

doc calculate days in month 2

Note: If you just have year numbers in the column, this formula: =365+IF(MOD(A2,4),0,1) can help you to calculate the days in the given years as following screenshot shown:

doc calculate days in month 3


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    Charles · 6 months ago
    How about this for Number of Days in THIS year (covers leap year or not)…. =EOMONTH(DATE(YEAR(TODAY()),12,1),0) - DATE(YEAR(TODAY()),1,0)

    EOMONTH finds December 31 of this year, from TODAY() and them subtracts the day before January 1st using the DATE YEAR TODAY using 0 which is one less than 1.