Option Compare Database
Option Explicit
'***************** Code Start **************
Public Function Diff2Dates(Interval As String, Date1 As Date, Date2 As Date, _
Optional ShowZero As Boolean = False) As Variant
On Error GoTo Err_Diff2Dates
 
   Dim booCalcYears As Boolean
   Dim booCalcMonths As Boolean
   Dim booCalcDays As Boolean
   Dim booCalcHours As Boolean
   Dim booCalcMinutes As Boolean
   Dim booCalcSeconds As Boolean
   Dim booSwapped As Boolean
   Dim dtTemp As Date
   Dim intCounter As Integer
   Dim lngDiffYears As Long
   Dim lngDiffMonths As Long
   Dim lngDiffDays As Long
   Dim lngDiffHours As Long
   Dim lngDiffMinutes As Long
   Dim lngDiffSeconds As Long
   Dim varTemp As Variant
 
   Const INTERVALS As String = "dmyhns"
 
'Check that Interval contains only valid characters
   Interval = LCase$(Interval)
   For intCounter = 1 To Len(Interval)
      If InStr(1, INTERVALS, Mid$(Interval, intCounter, 1)) = 0 Then
         Exit Function
      End If
   Next intCounter
 
'Check that valid dates have been entered
   If Not (IsDate(Date1)) Then Exit Function
   If Not (IsDate(Date2)) Then Exit Function
 
'If necessary, swap the dates, to ensure that
'Date1 is lower than Date2
   If Date1 > Date2 Then
      dtTemp = Date1
      Date1 = Date2
      Date2 = dtTemp
      booSwapped = True
   End If
 
   Diff2Dates = Null
   varTemp = Null
 
'What intervals are supplied
   booCalcYears = (InStr(1, Interval, "y") > 0)
   booCalcMonths = (InStr(1, Interval, "m") > 0)
   booCalcDays = (InStr(1, Interval, "d") > 0)
   booCalcHours = (InStr(1, Interval, "h") > 0)
   booCalcMinutes = (InStr(1, Interval, "n") > 0)
   booCalcSeconds = (InStr(1, Interval, "s") > 0)
 
'Get the cumulative differences
   If booCalcYears Then
      lngDiffYears = Abs(DateDiff("yyyy", Date1, Date2)) - _
              IIf(Format$(Date1, "mmddhhnnss") <= Format$(Date2, "mmddhhnnss"), 0, 1)
      Date1 = DateAdd("yyyy", lngDiffYears, Date1)
   End If
 
   If booCalcMonths Then
      lngDiffMonths = Abs(DateDiff("m", Date1, Date2)) - _
              IIf(Format$(Date1, "ddhhnnss") <= Format$(Date2, "ddhhnnss"), 0, 1)
      Date1 = DateAdd("m", lngDiffMonths, Date1)
   End If
 
   If booCalcDays Then
      lngDiffDays = Abs(DateDiff("d", Date1, Date2)) - _
              IIf(Format$(Date1, "hhnnss") <= Format$(Date2, "hhnnss"), 0, 1)
      Date1 = DateAdd("d", lngDiffDays, Date1)
   End If
 
   If booCalcHours Then
      lngDiffHours = Abs(DateDiff("h", Date1, Date2)) - _
              IIf(Format$(Date1, "nnss") <= Format$(Date2, "nnss"), 0, 1)
      Date1 = DateAdd("h", lngDiffHours, Date1)
   End If
 
   If booCalcMinutes Then
      lngDiffMinutes = Abs(DateDiff("n", Date1, Date2)) - _
              IIf(Format$(Date1, "ss") <= Format$(Date2, "ss"), 0, 1)
      Date1 = DateAdd("n", lngDiffMinutes, Date1)
   End If
 
   If booCalcSeconds Then
      lngDiffSeconds = Abs(DateDiff("s", Date1, Date2))
      Date1 = DateAdd("s", lngDiffSeconds, Date1)
   End If
 
   If booCalcYears And (lngDiffYears > 0 Or ShowZero) Then
      varTemp = lngDiffYears & IIf(lngDiffYears <> 1, " Yıl", " Yıl")
   End If
 
   If booCalcMonths And (lngDiffMonths > 0 Or ShowZero) Then
      If booCalcMonths Then
         varTemp = varTemp & IIf(IsNull(varTemp), Null, " ") & _
                   lngDiffMonths & IIf(lngDiffMonths <> 1, " Ay ", " Ay")
      End If
   End If
 
   If booCalcDays And (lngDiffDays > 0 Or ShowZero) Then
      If booCalcDays Then
         varTemp = varTemp & IIf(IsNull(varTemp), Null, " ") & _
                   lngDiffDays & IIf(lngDiffDays <> 1, " Gün", " Gün")
      End If
   End If
 
   If booCalcHours And (lngDiffHours > 0 Or ShowZero) Then
      If booCalcHours Then
         varTemp = varTemp & IIf(IsNull(varTemp), Null, " ") & _
                   lngDiffHours & IIf(lngDiffHours <> 1, " hours", " hour")
      End If
   End If
 
   If booCalcMinutes And (lngDiffMinutes > 0 Or ShowZero) Then
      If booCalcMinutes Then
         varTemp = varTemp & IIf(IsNull(varTemp), Null, " ") & _
                   lngDiffMinutes & IIf(lngDiffMinutes <> 1, " minutes", " minute")
      End If
   End If
 
   If booCalcSeconds And (lngDiffSeconds > 0 Or ShowZero) Then
      If booCalcSeconds Then
         varTemp = varTemp & IIf(IsNull(varTemp), Null, " ") & _
                   lngDiffSeconds & IIf(lngDiffSeconds <> 1, " seconds", " second")
      End If
   End If
 
   If booSwapped Then
      varTemp = "-" & varTemp
   End If
 
   Diff2Dates = Trim$(varTemp)
 
End_Diff2Dates:
   Exit Function
 
Err_Diff2Dates:
   Resume End_Diff2Dates
 
End Function
'************** Code End *****************