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How to find first / last day or working day of a month in Excel?

Do you know how to find the first or last day and the first or last working day of a given month date in a worksheet? For example, I have a date 2014/5/21, and now I want to know the first and last day of this month, that is 2014/5/1 and 2014/5/31, to get the first business day is 2014/5/1 and the last business day is 2014/5/30. This article will describe how to extract the first or last day and first or last working day in Excel of a given month.

Find the first or last day of a month with formulas

Find the first or last working day of a month with formulas


arrow blue right bubbleFind the first or last day of a month with formulas


To return the first day of a month, you can use this Date function, please do as these:

1. Enter this formula =DATE(YEAR(B1),MONTH(B1),1) into a blank cell (B1 contains the date that you want to use), see screenshot:

doc-find-first-day1

2. And press Enter key, you will get the first day of this month.

doc-find-first-day1

Note: In order to get the last day of this month, you need to apply this formula: =DATE(YEAR(B1),1+MONTH(B1),1)-1, see screenshots:

doc-find-first-day3
-1
doc-find-first-day4

arrow blue right bubbleFind the first or last working day of a month with formulas

In certain situation, you may want to know which day is the first or last business day of a given month date, and the following formulas can help you quickly calculate the results as you need.

1. To return the first working day of a month:

Apply this formula: =WORKDAY(DATE(YEAR(B1),MONTH(B1),1)-1,1) into a blank cell (B1 has the date that you want to use), and then press Enter key, the date of first working day will be calculated. See screenshots:

doc-find-first-day3
-1
doc-find-first-day4

2.To return the last working day of a month:

Please enter this formula: =WORKDAY(DATE(YEAR(B1),MONTH(B1)+1,1),-1) to extract the last working days of a given month date, see screenshots:

doc-find-first-day3
-1
doc-find-first-day4

Related articles:

How to add / subtract days / months / years to date in Excel?

How to count the number of specific weekdays between two dates in Excel?

How to count / calculate the number of days between two dates in Excel?

How to count / calculate weeks / months / years between two dates in Excel?


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