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Class: BusinessDatesTableADO in Category General VBA/VB6 : Date and Time from Total Visual SourceBook

Business day math (taking holidays into account) with holidays stored in a table using ADO to support ACCDB/MDB/ADP database formats for VBA and VB6

Procedure List

Procedure Name

Type

Description

(Declarations) Declarations Declarations and private variables for the CBusinessDatesTableADO class
Class_Terminate Terminate Close opened objects
Initialize Method Defines the holiday table and its field names. Use an existing table or create it. This method must be called before using any of the class methods to work with business days. Uses ADO to support ACCDB/MDB and ADPs.
IsTable Method Determine if the table in the specified database exists.
CreateHolidayTable Method Create a table for the holiday records.
AddHolidayYear Method Add holiday records for a range of years to the holiday table defined in the Initialize function.
HolidayDateFixed Method For fixed date holidays (New Year's, 4th of July, Christmas), returns the celebrated date based on Federal guidelines. i.e. Saturday dates are shifted to Friday, and Sunday dates are shifted to Monday.
LastDayOfWeekInMonth Private Calculates the last day (Sunday, Monday, etc.) of the month.
NthDayOfMonth Private Get the date of the Nth day (Monday, Tuesday, etc.) of the month.
AddHoliday Private Add a record to the holiday table.
IsHoliday Method Determine if the specified date is a holiday (in the holiday table).
IsBusinessDay Method Determine if the specified date is a business day (not in the holiday table and not a weekend day).
HolidayName Method Determine if the specified date is in the holiday table, and if so, provide the holiday name. Requires the holiday field name to exist with a value to retrieve.
GetNextHoliday Method Determine the next holiday date after the provided date.
GetNextHolidayName Method Get the next holiday name after the provided date.
GetNextHolidayDateName Method Get the next holiday date and name after the provided date.
GetPrevHoliday Method Determine the holiday date before the provided date.
GetPrevHolidayName Method Get the holiday name before the provided date.
GetPrevHolidayDateName Method Get the holiday date and name before the provided date.
FindHoliday Private Locates a holiday in the private holiday array.
GetBusinessDay Method Determine if a date is a business day and if not, find the next or previous business day. Weekend dates (Saturday and Sunday) are not considered business days.
MonthFirstBusinessDay Method Calculate the first business day of the month.
MonthLastBusinessDay Method Calculate the last business day of the month.
YearBusinessDays Method Number of business days in a year.
DiffBusinessDays Method Get the number of business days between two dates. The second date is adjusted to the next day to include the full day. Weekend dates (Saturday and Sunday) and holidays are not counted.
DiffWeekdays Private Get the number of weekdays between two dates. The days are rounded down (it takes 24 hours to make a day).
AddBusinessDays Method Add or subtract a number of business days to a date. Weekend dates (Saturday and Sunday) are not counted in adding/subtracting days.
BusinessDaysInMonth Method Get the number of business days in a month.

Example Code for Using Class: BusinessDatesTableADO

' Example of CBusinessDatesTableADO
'
' To use this example, create a new module and paste this code into it.
' Then run either of the procedures by putting the cursor in the procedure and press:
'    F5 to run it, or
'    F8 to step through it line-by-line (see the Debug menu for more options)

' Comments: Example of using the CBusinessDatesTableADO class to create a table with holidays, read from it, and perform math based on it using VBA or VB6.
'           Two procedures are provided. The first creates the holiday table, the second performs business day math based on the values in the holiday table.

' This is the name of the holiday table to be created/used
Private Const mcstrHolidayTable As String = "tblHolidays"

Private Sub Example_CBusinessDatesTableADO_Creation()
  ' Comments: Example of using the CBusinessDatesTableADO class to create a file with holidays and read from it.

  Dim clsBusinessDates As CBusinessDatesTableADO
  Dim fCreate As Boolean

  ' Instantiate the CBusinessDatesTableADO class
  Set clsBusinessDates = New CBusinessDatesTableADO

  ' Determine if holiday file should be overwritten if it exists
  fCreate = False
  If clsBusinessDates.IsTable(CurrentProject.Connection, mcstrHolidayTable) Then
    fCreate = (MsgBox("Do you want to overwrite the exsting holiday table?" & vbCrLf & mcstrHolidayTable, vbQuestion + vbYesNo) = vbYes)
  Else
    fCreate = True
  End If

  ' Load the holiday table. If it doesn't exist, create it
  If clsBusinessDates.Initialize(CurrentProject.Connection, fCreate, mcstrHolidayTable, "HolidayDate", "HolidayName") Then
    If fCreate Then
      ' Add holidays for the next 2 years
      clsBusinessDates.AddHolidayYear Year(Now), Year(Now) + 2
    End If
  End If

  ' Clean up by closing the class
  Set clsBusinessDates = Nothing

  ' Run the next procedure to show the business day math
  Example_CBusinessDatesTableADO_Math

End Sub

Private Sub Example_CBusinessDatesTableADO_Math()
  ' Comments: Example of using the CBusinessDatesTableADO class to perform business day math based on a holiday file that was already created
  ' Uses    : mcstrHolidayTable as the name of the file containing the holidays

  Dim datDate1 As Date
  Dim datDate2 As Date
  Dim datDate3 As Date
  Dim intMonth As Integer
  Dim datFirst As Date
  Dim strName As String

  ' Peform business day math with these dates:
  datDate1 = DateSerial(Year(Now), 1, 1)        ' First day of the year
  datDate2 = DateSerial(Year(Now), 12, 31)      ' Last day of year
  datDate3 = DateSerial(Year(Now), 7, 4)        ' Fixed date holiday: July 4th

  ' Define and Instantiate the CBusinessDatesTableADO class
  Dim clsBusinessDates As New CBusinessDatesTableADO

  With clsBusinessDates
    ' Load the holiday table
    If .Initialize(CurrentProject.Connection, False, mcstrHolidayTable, "HolidayDate", "HolidayName") Then

      ' Example for BusinessDaysInMonth
      Debug.Print "Business Days by Month:"
      For intMonth = 1 To 12
        datFirst = DateSerial(Year(Now), intMonth, 1)
        Debug.Print "  " & Format$(datFirst, "mmm-yyyy") & ": ", .BusinessDaysInMonth(intMonth, Year(datDate1))
      Next intMonth
      Debug.Print "Total Business Days in Year: " & .YearBusinessDays(Year(Now))

      ' Example for DiffBusinessDays
      Debug.Print "Business Days " & datDate1 & " to " & datDate2 & ": ", .DiffBusinessDays(datDate1, datDate2)
      Debug.Print "Business Days " & datDate2 & " to " & datDate1 & ": ", .DiffBusinessDays(datDate2, datDate1)

      ' Example for AddBusinessDays
      Debug.Print "Add Business Days: " & datDate1 & " plus 10: ", .AddBusinessDays(datDate1, 10)

      ' Example for GetBusinessDay - Next
      Debug.Print "Business Day on or After " & datDate1 & ": ", .GetBusinessDay(datDate1, True)

      ' Example for GetBusinessDay - Previous
      Debug.Print "Business Day on or Before " & datDate1 & ": ", .GetBusinessDay(datDate1, False)

      ' Example for HolidayDateFixed
      Debug.Print
      Debug.Print datDate3 & " holiday is celebrated on: ", .HolidayDateFixed(datDate3)
      Debug.Print datDate3 & " is holiday:", .IsHoliday(datDate3)
      Debug.Print datDate3 & " is business day:", .IsBusinessDay(datDate3)
      Debug.Print datDate3 + 1 & " is holiday:", .IsHoliday(datDate3 + 1)
      Debug.Print datDate3 + 1 & " is business day:", .IsBusinessDay(datDate3 + 1)
      Debug.Print

      ' Example for next and previous holiday dates and names:
      Debug.Print "First Holiday after  " & datDate3 & ": ", .GetNextHoliday(datDate3), .GetNextHolidayName(datDate3)
      Debug.Print "First Holiday before " & datDate3 & ": ", .GetPrevHoliday(datDate3), .GetPrevHolidayName(datDate3)

      ' Example for next and previous holiday dates and names:
      Debug.Print "First Holiday after  " & datDate2 & ": ", .GetNextHolidayDateName(datDate2, strName), strName
      Debug.Print "First Holiday before " & datDate2 & ": ", .GetPrevHolidayDateName(datDate2, strName), strName

      ' Example for MonthFirstBusinessDay
      Debug.Print "First Business Day of Month " & Format$(datDate1, "mmm-yyyy") & ": ", .MonthFirstBusinessDay(Month(datDate1), Year(datDate1))

      ' Example for MonthLastBusinessDay
      Debug.Print "Last Business Day of Month " & Format$(datDate1, "mmm-yyyy") & ": ", .MonthLastBusinessDay(Month(datDate1), Year(datDate1))
      Debug.Print
    End If
  End With

  ' Clean up by closing the class
  Set clsBusinessDates = Nothing

End Sub

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