Excel VBA script for loop with dates - vba

Question

I am calculating the number of work hours (8am to 8pm) between the 2 given dates, excluding Weekends and Public holidays, but my code syntax is incorrect.
Sample data:
Start day: 17/06/2011 08:00:00 AM
End day: 19/06/2011 08:00:00 PM
Sub SLA_Days_Resolved_F()
Dim x As Integer
' Set numrows = number of rows of data.
NumRows = Range("F2", Range("F2").End(xlDown)).Rows.Count
Dim total As Integer 'to count the total hours
Dim st As String 'start date cell
Dim en As String 'end date cell
Dim destCell As String
Dim d As Date ' for the loop
total = 0
' Establish "For" loop to loop "numrows" number of times.
For x = 2 To NumRows + 1
st = "G" & CStr(x) 'reference to the cells
en = "D" & CStr(x)
'loop from start date to end date
For d = Date(Range(st)) To Date(Range(en))
'check if the current date is found is a Public holiday in the range or if a weekend
If ((Vlookup(d,lookups!$o$3:$p$26,2,false))=1) or (weekend(d))Then
'minus 8 to remove hours before 8am.
total = (total + Hour(d) + minutes(d) / 60) - 8
End If
Next
Next
End Sub

Answer 1

You are not assigning any values to variables st or en.
Date is not a function available in VBA. You will probably need to use DateSerial function. Here is a simple example of looping over dates which you should be able to modify.
Sub LoopDates()
Dim d As Date
'Loop the days beteween today and March 1, 2013.
For d = DateSerial(Year(Now), Month(Now), Day(Now)) To DateSerial(2013, 3, 1)
Debug.Print d 'Prints the "d" value in the immediate window.
Next
End Sub
Also, you can't just put worksheet formulae in VBA. This line is definitely wrong syntax for Vlookup, and Weekend is not a formula that I'm aware of (testing it seems to confirm it is not a valid call on worksheet or in VBA.
If ((Vlookup(d,lookups!$o$3:$p$26,2,false))=1) or (weekend(d))Then
Rewrite as:
If Application.WorksheetFunction.Vlookup(d,Sheets("lookups").Range("$o$3:$p$26"),2,false)=1 _
or Not Application.WorksheetFunction.Weekday(d) Then
ANOTHER EXAMPLE of a date loop where I have dimensioned the variables in what I believe to be a more efficient manner:
Sub Test()
Dim st As Range
Dim x As Integer
Dim stDate As Date
Dim enDate As Date
Dim d As Date
Dim numRows as Long
NumRows = Range("F2", Range("F2").End(xlDown)).Rows.Count
For x = 0 To NumRows-2
'SET YOUR VARIABLES HERE
' This may seem redundant or unnecessary for this case, but it makes structuring nested
' loops easier to work with, and then there are fewer places to make changes,
' if you need to make changes.
Set st = Range("G2").Offset(x, 0)
Set en = Range("D2").Offset(x, 0)
stDate = DateSerial(Year(st), Month(st), Day(st))
enDate = DateSerial(Year(en), Month(en), Day(en))
'Then, loop through the dates as necessary
For d = stDate To enDate
Debug.Print d
'Do your code here.
Next
Next
End Sub