Excel Formulas for First and Last Dates of a Month

This document provides the Excel formulas to determine the first and last dates of a specific month, along with explanations and practical examples.

1. Formula for the First Date of the Month

Formula

To find the first date of a month from a given date (in cell A1):

=EOMONTH(A1, -1) + 1

Explanation

• EOMONTH(A1, -1): This function returns the last day of the previous month based on the date in cell A1.
• By adding 1, we get the first day of the current month.

Example

Assuming cell A1 contains the date 2023-10-15:

• =EOMONTH(A1, -1) + 1 will result in 2023-10-01.

2. Formula for the Last Date of the Month

Formula

To find the last date of a month from a given date (in cell A1):

=EOMONTH(A1, 0)

Explanation

• EOMONTH(A1, 0): This function returns the last day of the month for the date in cell A1.

Example

Assuming cell A1 contains the date 2023-10-15:

• =EOMONTH(A1, 0) will result in 2023-10-31.

Summary

• First Date of the Month: =EOMONTH(A1, -1) + 1
• Last Date of the Month: =EOMONTH(A1, 0)

These formulas allow for effective date handling in Excel, aiding in numerous analysis scenarios. For further mastery of Excel formulas, consider exploring courses on the Enterprise DNA Platform.