You are currently offline, waiting for your internet to reconnect

How to calculate ages before 1/1/1900 in Excel

Support for Office 2003 has ended

Microsoft ended support for Office 2003 on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article was previously published under Q245104
SUMMARY
Although Microsoft Excel date formulas can only use dates entered between 1/1/1900 and 12/31/9999, you can use a custom Microsoft Visual Basic for Applications function to calculate the age (in years) of someone or something that was first created before January 1, 1900.

back to the top

Use Macro to Calculate Age

Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements.
Excel enters dates prior to 1/1/1900 as text. This function works for dates entered as text beginning with 1/1/0001, normal dates, and can handle dates when the starting date is before 1900 and ending date is after 1900. To use the macro, follow these steps:
  1. Start Excel. View the worksheet on which you want to use the function.
  2. Press ALT+F11 to switch to the Visual Basic Editor.
  3. On the Insert menu, click Module.
  4. Type the following code in the module:
    ' This is the initial function. It takes in a start date and an end date.Public Function AgeFunc(stdate As Variant, endate As Variant)        ' Dim our variables.    Dim stvar As String    Dim stmon As String    Dim stday As String    Dim styr As String    Dim endvar As String    Dim endmon As String    Dim endday As String    Dim endyr As String    Dim stmonf As Integer    Dim stdayf As Integer    Dim styrf As Integer    Dim endmonf As Integer    Dim enddayf As Integer    Dim endyrf As Integer    Dim years As Integer        ' This variable will be used to modify string length.    Dim fx As Integer    fx = 0        ' Calls custom function sfunc which runs the Search worksheet function    ' and returns the results.    ' Searches for the first "/" sign in the start date.    stvar = sfunc("/", stdate)        ' Parse the month and day from the start date.    stmon = Left(stdate, sfunc("/", stdate) - 1)    stday = Mid(stdate, stvar + 1, sfunc("/", stdate, sfunc("/", stdate) + 1) - stvar - 1)        ' Check the length of the day and month strings and modify the string     ' length variable.    If Len(stday) = 1 Then fx = fx + 1    If Len(stmon) = 2 Then fx = fx + 1        ' Parse the year, using information from the string length variable.    styr = Right(stdate, Len(stdate) - (sfunc("/", stdate) + 1) - stvar + fx)            ' Change the text values we obtained to integers for calculation     ' purposes.    stmonf = CInt(stmon)    stdayf = CInt(stday)    styrf = CInt(styr)        ' Check for valid date entries.    If stmonf < 1 Or stmonf > 12 Or stdayf < 1 Or stdayf > 31 Or styrf < 1 Then        AgeFunc = "Invalid Date"        Exit Function    End If    ' Reset the string length variable.    fx = 0        ' Parse the first "/" sign from the end date.    endvar = sfunc("/", endate)        ' Parse the month and day from the end date.    endmon = Left(endate, sfunc("/", endate) - 1)    endday = Mid(endate, endvar + 1, sfunc("/", endate, sfunc("/", endate) + 1) - endvar - 1)        ' Check the length of the day and month strings and modify the string     ' length variable.    If Len(endday) = 1 Then fx = fx + 1    If Len(endmon) = 2 Then fx = fx + 1        ' Parse the year, using information from the string length variable.    endyr = Right(endate, Len(endate) - (sfunc("/", endate) + 1) - endvar + fx)            ' Change the text values we obtained to integers for calculation     ' purposes.    endmonf = CInt(endmon)    enddayf = CInt(endday)    endyrf = CInt(endyr)        ' Check for valid date entries.    If endmonf < 1 Or endmonf > 12 Or enddayf < 1 Or enddayf > 31 Or endyrf < 1 Then        AgeFunc = "Invalid Date"        Exit Function    End If        ' Determine the initial number of years by subtracting the first and     ' second year.    years = endyrf - styrf        ' Look at the month and day values to make sure a full year has passed.     If stmonf > endmonf Then        years = years - 1    End If            If stmonf = endmonf And stdayf > enddayf Then        years = years - 1    End If    ' Make sure that we are not returning a negative number and, if not,     ' return the years.    If years < 0 Then        AgeFunc = "Invalid Date"    Else        AgeFunc = years    End If    End Function' This is a second function that the first will call.' It runs the Search worksheet function with arguments passed from AgeFunc.' It is used so that the code is easier to read.Public Function sfunc(x As Variant, y As Variant, Optional z As Variant)    sfunc = Application.WorksheetFunction.Search(x, y, z)End Function					
  5. Save the file.
  6. Type the following data:
    A1   01/01/1887A2   02/02/1945						
    In cell A3, enter the following formula
    =AgeFunc(startdate,enddate)
    where startdate is a cell reference to your first date (A1) and enddate is a cell reference to your second date (A2).

    The result should be 58.
NOTE: Check all dates before 1/1/1900 for validity. Dates entered as text are not checked by Excel.

back to the top
REFERENCES
For more information about how to use the sample code in this article, clickthe article number below to view the article in the Microsoft Knowledge Base:
212536 How to Run Sample Code from Knowledge Base Articles

back to the top
XL2000 xl2003 xl2007
Properties

Article ID: 245104 - Last Review: 01/25/2007 01:25:14 - Revision: 5.1

Microsoft Office Excel 2007, Microsoft Office Excel 2003, Microsoft Excel 2002 Standard Edition, Microsoft Excel 2000 Standard Edition

  • kbhowtomaster KB245104
Feedback
s.dqp0';m.content='true';document.getElementsByTagName('head')[0].appendChild(m);" onload="var m=document.createElement('meta');m.name='ms.dqp0';m.content='false';document.getElementsByTagName('head')[0].appendChild(m);" src="http://c1.microsoft.com/c.gif?">