How to create two functions to calculate age in months and in years in Access
Advanced: Requires expert coding, interoperability, and multiuser skills.
This article applies to a Microsoft Office Access database (.accdb and .mdb) and to Microsoft Access project (.apd).
Summary
This article shows you how to create two functions that you can use to calculate the age of a person or thing based on a specified date.
Note
You can see a demonstration of the technique that is used in this article in the sample file Qrysmp00.exe.
More information
Creating the Functions
Type or paste the following code in a module:
'==========================================================
' General Declaration
'==========================================================
Option Explicit
'*************************************************************
' FUNCTION NAME: Age()
'
' PURPOSE:
' Calculates age in years from a specified date to today's date.
'
' INPUT PARAMETERS:
' StartDate: The beginning date (for example, a birth date).
'
' RETURN
' Age in years.
'
'*************************************************************
Function Age (varBirthDate As Variant) As Integer
Dim varAge As Variant
If IsNull(varBirthdate) then Age = 0: Exit Function
varAge = DateDiff("yyyy", varBirthDate, Now)
If Date < DateSerial(Year(Now), Month(varBirthDate), _
Day(varBirthDate)) Then
varAge = varAge - 1
End If
Age = CInt(varAge)
End Function
'*************************************************************
' FUNCTION NAME: AgeMonths()
'
' PURPOSE:
' Compliments the Age() function by calculating the number of months
' that have expired since the last month supplied by the specified date.
' If the specified date is a birthday, the function returns the number of
' months since the last birthday.
'
' INPUT PARAMETERS:
' StartDate: The beginning date (for example, a birthday).
'
' RETURN
' Months since the last birthday.
'*************************************************************
Function AgeMonths(ByVal StartDate As String) As Integer
Dim tAge As Double
tAge = (DateDiff("m", StartDate, Now))
If (DatePart("d", StartDate) > DatePart("d", Now)) Then
tAge = tAge - 1
End If
If tAge < 0 Then
tAge = tAge + 1
End If
AgeMonths = CInt(tAge Mod 12)
End Function
Testing the Age() and AgeMonths() Functions
To test the Age() and AgeMonths() functions, follow these steps.
Important
The following steps ask you to change the date on your computer. Make sure that you complete step 6 to reset the date to the current date.
By using the Date/Time tool in Control Panel, make a note of the current date, and then set the date to June 3, 2001.
Open a module or create a new one.
On the Viewmenu, click Immediate Window.
Assume your friend's birth date was November 15, 1967 and today is June 3, 2001. Type the following line in the Immediate window, and then press ENTER:
?Age("11/15/67")
Note that Microsoft Access responds with the value 33 (years).
Type the following line, and then press ENTER:
?AgeMonths("11/15/67")
Note that Microsoft Access responds with the value 6, indicating that six months have passed since this person's last birthday. Your friend is 33 years and six months old.
By using the Date/Time tool in Control Panel, reset the date to the current date that you noted in step 1.
Using the Age() and AgeMonths() Functions
The following procedure explains how to mark old orders by placing the age value in a new control.
In the sample database Northwind.mdb, type the Age() and AgeMonth() functions in a new module.
Open the Orders form in Design view and add an unbound text box control.
Type the following line in the ControlSourceproperty of the new text box control:
=Age([OrderDate]) & " yrs " & AgeMonths([OrderDate]) & " mos"
View the form in Form view. Note that the age of the order is displayed in the new text box control.
References
For more information about date differences, in the Visual Basic Editor, click Microsoft Visual Basic Help on the Help menu, type datediff function in the Office Assistant or the Answer Wizard, and then click Search to view the topic.
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