HOW TO: Determine If a Date Falls on a Weekend or on a Holiday in Access 2000 (210064)

SUMMARY

This article shows you how to create a Visual Basic for Applications function to determine if a date falls on a weekend or holiday. This example is useful for setting due dates in applications that have billing or invoicing features.

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. The following example uses the WeekDay() function to determine if a specific date falls on a Saturday or Sunday. Then, it uses a DLookup() function to determine if it falls on a date stored in a user-created Holidays table.

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Create a Holidays Table

The following example requires a table with a particular structure for storing Holiday dates. To create the table and sample records, follow these steps:

1. Create a new table in Design view and add the following fields:

      Table: Holidays
      -----------------------
      Field Name: HolidayName
        Data Type: Text
      Field Name: HoliDate
        Date Type: Date/Time
   					

2. Save the table as Holidays and switch the table to Datasheet view. Add the following records:

      HolidayName                         HoliDate
      --------------------------------------------
      New Year's Day                      1/1/2000
      Martin Luther King, Jr. Day (USA)   1/15/2000
      Memorial Day (observed-USA)         5/29/2000
      Labor Day (USA)                     9/4/2000
   					

3. Close and save the Holidays table.

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Create the Custom Function

To create a function that determines if a date falls on a weekend or holiday, follow these steps:

1. Create a new module in Design view.
2. Add the following function:

   Function OfficeClosed(TheDate) As Integer
      
      OfficeClosed = False
        TheDate = Format(TheDate, "dd/mm/yyyy")
      ' Test for Saturday or Sunday.
      If WeekDay(TheDate) = 1 Or WeekDay(TheDate) = 7 Then
          OfficeClosed = True
      ' Test for Holiday.
      ElseIf Not IsNull(DLookup("HoliDate", "Holidays", "[HoliDate]=#" _
        & TheDate & "#")) Then
          OfficeClosed = True
      End If
   
   End Function
   					

3. To test this function, type the following line into the Immediate window, and then press ENTER:

   ? OfficeClosed(#9/4/2000#)
   					

   Note that this returns a True value (-1) because 9/4/2000 is listed in the Holidays table.

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Usage Example

You can use the custom OfficeClosed() function to calculate due dates. For example, if your office or business is closed for a three-day weekend, you may want to extend your customers' grace period for their outstanding bills. Here's sample code for adding one more day to a grace period:

DueDate=OrderDate+30
Do While OfficeClosed(DueDate)
   DueDate=DateDue+1
Loop
				

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