Altri Linguaggi - evento calculate

Vorrei far si che mi parta automaticamente (anzi che manualmente) una macro al cambiamento automatico di orario in tre celle dove le ore vengono messe li tramite formule
excel 2003

Nel foglio ho inserito questo codice

Private Sub Worksheet_Change(ByVal Target As Range)
If Not Intersect(Range("AX1,AY1,AZ1"), Target) Is Nothing Then
    If Range("AX1") <> "" And Range("AY1") <> "" _
    And Range("AZ1") <> "" Then Call minuti
End If
End Sub

E nel modulo

Sub minuti()
Dim AX As Range
Dim AY As Range
Dim AZ As Range
Dim F As Range
Dim G As Range
Dim H As Range

Set AX = ThisWorkbook.Sheets("GEN ").Range("AX1")
Set AY = ThisWorkbook.Sheets("GEN ").Range("AY1")
Set AZ = ThisWorkbook.Sheets("GEN ").Range("AZ1")
Set F = ThisWorkbook.Sheets("GEN ").Range("F10")
Set G = ThisWorkbook.Sheets("GEN ").Range("G10")
Set H = ThisWorkbook.Sheets("GEN ").Range("H10")

Select Case True

'PRIMO CASO
Case VBA.Minute(AX) > 30 And VBA.Minute(AY) = 0 And VBA.Minute(AZ) = 0
    Application.EnableEvents = False
    F = VBA.Hour(AX) + 1
    G = VBA.Hour(AY)
    H = VBA.Hour(AZ)

Case VBA.Minute(AX) = 0 And VBA.Minute(AY) > 30 And VBA.Minute(AZ) = 0
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY) + 1
    H = VBA.Hour(AZ)
    
Case VBA.Minute(AX) = 0 And VBA.Minute(AY) = 0 And VBA.Minute(AZ) > 30
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY)
    H = VBA.Hour(AZ) + 1
    
'SECONDO CASO
Case VBA.Minute(AX) > 0 And VBA.Minute(AY) > 0 And VBA.Minute(AZ) = 0 _
And VBA.Minute(AX) + VBA.Minute(AY) > 30 And VBA.Minute(AX) _
+ VBA.Minute(AY) <= 60
    Application.EnableEvents = False
    F = VBA.Hour(AX) + 1
    G = VBA.Hour(AY)
    H = VBA.Hour(AZ)
    
Case VBA.Minute(AX) > 0 And VBA.Minute(AY) > 0 And VBA.Minute(AZ) = 0 _
And VBA.Minute(AX) + VBA.Minute(AY) > 60
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY) + 1
    H = VBA.Hour(AZ)
    
'TERZO CASO
Case VBA.Minute(AX) > 0 And VBA.Minute(AY) = 0 And VBA.Minute(AZ) > 0 _
And VBA.Minute(AX) + VBA.Minute(AZ) > 30 And VBA.Minute(AX) _
+ VBA.Minute(AZ) <= 60
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY) + 1
    H = VBA.Hour(AZ)
    

Case VBA.Minute(AX) > 0 And VBA.Minute(AY) = 0 And VBA.Minute(AZ) > 0 _
And VBA.Minute(AX) + VBA.Minute(AZ) > 60
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY)
    H = VBA.Hour(AZ) + 1
    

'QUARTO CASO
Case VBA.Minute(AX) = 0 And VBA.Minute(AY) > 0 And VBA.Minute(AZ) > 0 _
    And VBA.Minute(AY) + VBA.Minute(AZ) > 30 And VBA.Minute(AY) _
    + VBA.Minute(AZ) <= 60
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY) + 1
    H = VBA.Hour(AZ)

Case VBA.Minute(AX) = 0 And VBA.Minute(AY) > 0 And VBA.Minute(AZ) > 0 _
    And VBA.Minute(AY) + VBA.Minute(AZ) > 60
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY)
    H = VBA.Hour(AZ) + 1
    

'OTTAVO CASO
Case VBA.Minute(AX) > 0 And VBA.Minute(AY) > 0 And VBA.Minute(AZ) > 0 _
And VBA.Minute(AX) + VBA.Minute(AY) + VBA.Minute(AZ) > 150
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY) + 1
    H = VBA.Hour(AZ) + 2


'SETTIMO CASO
Case VBA.Minute(AX) > 0 And VBA.Minute(AY) > 0 And VBA.Minute(AZ) > 0 _
And VBA.Minute(AX) + VBA.Minute(AY) + VBA.Minute(AZ) > 120 _
And VBA.Minute(AX) + VBA.Minute(AY) + VBA.Minute(AZ) <= 150
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY)
    H = VBA.Hour(AZ) + 2

'SESTO CASO
Case VBA.Minute(AX) > 0 And VBA.Minute(AY) > 0 And VBA.Minute(AZ) > 0 _
And VBA.Minute(AX) + VBA.Minute(AY) + VBA.Minute(AZ) > 60 _
And VBA.Minute(AX) + VBA.Minute(AY) + VBA.Minute(AZ) <= 90
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY)
    H = VBA.Hour(AZ) + 1

Case VBA.Minute(AX) > 0 And VBA.Minute(AY) > 0 And VBA.Minute(AZ) > 0 _
And VBA.Minute(AX) + VBA.Minute(AY) + VBA.Minute(AZ) > 90 _
And VBA.Minute(AX) + VBA.Minute(AY) + VBA.Minute(AZ) <= 120
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY) + 1
    H = VBA.Hour(AZ) + 1

'QUINTO CASO
Case VBA.Minute(AX) > 0 And VBA.Minute(AY) > 0 And VBA.Minute(AZ) > 0 _
And VBA.Minute(AX) + VBA.Minute(AY) + VBA.Minute(AZ) > 30 _
And VBA.Minute(AX) + VBA.Minute(AY) + VBA.Minute(AZ) <= 60
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY) + 1
    H = VBA.Hour(AZ)

Case VBA.Minute(AX) > 0 And VBA.Minute(AY) > 0 And VBA.Minute(AZ) > 0 _
And VBA.Minute(AX) + VBA.Minute(AY) + VBA.Minute(AZ) > 60
    Application.EnableEvents = False
    F = VBA.Hour(AX)
    G = VBA.Hour(AY)
    H = VBA.Hour(AZ) + 1

'IN NESSUNA DELLE CONDIZIONI SOPRA
Case Else
    Application.EnableEvents = False
    F = ""
    G = ""
    H = ""

End Select

Set AX = Nothing
Set AY = Nothing
Set AZ = Nothing
Set F = Nothing
Set G = Nothing
Set H = Nothing
Application.EnableEvents = True
End Sub

Chi mi aiuta a mettere un evento Calculate?