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Excel VBA: Number of Specified Days in a Specified Month


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Number of Specified Days in a Specified Month. See Also: Determine nth Weekday of a Specified Date || Return Last Chosen Day of Given Month

The function below can be used to determine how may days (e.g Mondays etc) there are in any specified month. For example


will return 5 as there are five Wednesdays in the month of December in 2003


will return 4 as there are four Thursdays in the month of December in 2003

To be able to use this custom function in a Workbook, you must first place the code below into a standard module.

  1. Open the Workbook.
  2. Go to Tools>Macro>Visual Basic Editor (Alt+F11).
  3. Then to Insert>Module.
  4. Paste in the code.
  5. Click the top right X to return to Excel.

'The Code

Function HowManyDaysInMonth(FullDateAs String, sDay As String) As Integer

Dim i As Integer

Dim iDay As Integer, iMatchDay As Integer

Dim iDaysInMonth As Integer

Dim FullDateNew As Date

	iMatchDay = Weekday(FullDate)

		Select Case UCase(sDay)

 			Case "SUN"

				iDay = 1

			Case "MON"

				iDay = 2

			Case "TUE"quot;

				iDay = 3

			Case "WED"

				iDay = 4

			Case "THU"

				iDay = 5

			Case "FRI"

				iDay = 6

			Case "SAT"

				iDay = 7

			End Select


	iDaysInMonth = Day(DateAdd("d", -1, DateSerial _

		(Year(FullDate), Month(FullDate) + 1, 1)))


	FullDateNew = DateSerial(Year(FullDate), Month(FullDate), iDaysInMonth)


	For i = iDaysInMonth - 1 To 0 Step -1

		If Weekday(FullDateNew - i) = iDay Then

			HowManyDaysInMonth = HowManyDaysInMonth + 1

		End If

	Next i

End Function

Now simply enter the function into any cell as shown above.

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