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

Understanding the number of days in a given month or year is essential for precise time management and planning in Excel. Whether dealing with leap years (366 days) or common years (365 days), Excel can simplify these calculations through straightforward formulas and advanced tools like Kutools for Excel.

• Calculate number of days in a month or year with formulas
• Simplified day calcution with Kutools for Excel

Calculate number of days in a month or year with formulas

Suppose you have a list of dates in the range A2:A9, to find out the number of days in each month or year, use the following formulas.

Calculate the number of days in a month

Enter either of the following formulas in a cell such as C2 and press "Enter". Then drag the "Fill Handle" of this formula cell down to get the rest of the results.

=DAY(EOMONTH(A2, 0))

Calculate the number of days in a year

To calculate the days in a year, considering leap years, input this formula:

=DATE(YEAR(A2), 12, 31) - DATE(YEAR(A2), 1, 1) + 1

Alternatively, for a column of only year numbers, use this formula: =365 + IF(MOD(A2, 4) = 0, 1, 0)

Simplified day calcution with Kutools for Excel

For those who prefer not to remember or input formulas, "Kutools for Excel" provides a user-friendly feature that automates these calculations:

1. After installing Kutools for Excel, select the cell where you want the result to appear. And then select "Kutools" > "Formula Helper" > "Formula Helper".
2. Configure the "Formula Helper" dialog box as follows:
   1. Choose "Math" from the "Formula Type" drop-down list.
   2. Select "Calculate days in year" or "Calculate days in month", depending on your need.
   3. In the "Arguments" section, choose the cell with the date for which you need the day count.
   4. Click "OK".
      
3. Then drag the fill handle down to apply the formula to other cells.

Result

Whether you're scheduling projects, analyzing financial periods, or planning events, the methodology in this article provides an understanding of how to calculate the number of days in a month or year, thus ensuring accuracy and efficiency in date-related calculations.

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