Public Function BusinessDays(dteStartDate As Date, dteEndDate As Date) As Long
'使用方法: BusinessDays(開始日期,結束日期)
Dim lngYear As Long
Dim lngEYear As Long
Dim dteStart As Date, dteEnd As Date
Dim dteCurr As Date
Dim lngDay As Long
Dim lngDiff As Long
Dim lngACount As Long
Dim dteLoop As Variant
Dim blnHol As Boolean
Dim dteHoliday() As Date
Dim lngCount As Long, lngTotal As Long
Dim lngThanks As Long
dteStart = dteStartDate
dteEnd = dteEndDate
lngYear = DatePart("yyyy", dteStart)
lngEYear = DatePart("yyyy", dteEnd)
If lngYear <> lngEYear Then
lngDiff = (((lngEYear - lngYear) + 1) * 7) - 1
ReDim dteHoliday(lngDiff)
Else
ReDim dteHoliday(6)
End If
lngACount = -1
For lngCount = lngYear To lngEYear
lngACount = lngACount + 1
'July Fourth
dteHoliday(lngACount) = DateSerial(lngCount, 7, 4)
lngACount = lngACount + 1
'Christmas
dteHoliday(lngACount) = DateSerial(lngCount, 12, 25)
lngACount = lngACount + 1
'New Years
dteHoliday(lngACount) = DateSerial(lngCount, 1, 1)
lngACount = lngACount + 1
'Thanksgiving - 4th Thursday of November
lngDay = 1
lngThanks = 0
Do
If Weekday(DateSerial(lngCount, 11, lngDay)) = 5 Then
lngThanks = lngThanks + 1
End If
lngDay = lngDay + 1
Loop Until lngThanks = 4
dteHoliday(lngACount) = DateSerial(lngCount, 11, lngDay)
lngACount = lngACount + 1
'Memorial Day - Last Monday of May
lngDay = 31
Do
If Weekday(DateSerial(lngCount, 5, lngDay)) = 2 Then
dteHoliday(lngACount) = DateSerial(lngCount, 5, lngDay)
Else
lngDay = lngDay - 1
End If
Loop Until dteHoliday(lngACount) >= DateSerial(lngCount, 5, 1)
lngACount = lngACount + 1
'Labor Day - First Monday of Septemeber
lngDay = 1
Do
If Weekday(DateSerial(lngCount, 9, lngDay)) = 2 Then
dteHoliday(lngACount) = DateSerial(lngCount, 9, lngDay)
Else
lngDay = lngDay + 1
End If
Loop Until dteHoliday(lngACount) >= DateSerial(lngCount, 9, 1)
'MsgBox dteHoliday(5)
lngACount = lngACount + 1
'Easter
lngDay = (((255 - 11 * (lngCount Mod 19)) - 21) Mod 30) + 21
dteHoliday(lngACount) = DateSerial(lngCount, 3, 1) + lngDay + _
(lngDay > 48) + 6 - ((lngCount + lngCount \ 4 + _
lngDay + (lngDay > 48) + 1) Mod 7)
Next
For lngCount = 1 To DateDiff("d", dteStart, dteEnd)
dteCurr = (dteStart + lngCount)
If (Weekday(dteCurr) <> 1) And (Weekday(dteCurr) <> 7) Then
blnHol = False
For dteLoop = 0 To UBound(dteHoliday)
'MsgBox dteHoliday(dteLoop) & " " & dteLoop
If (dteHoliday(dteLoop) = dteCurr) Then
blnHol = True
End If
Next dteLoop
If blnHol = False Then
lngTotal = lngTotal + 1
'MsgBox dteCurr
End If
End If
Next lngCount
BusinessDays = lngTotal
End Function
