How calculate field on a report

On a repost I have 4 fields.  They are:

ShipDate (date field)
ReschDate (date field)
LastDateShpd (date field)
OnTime (text field)

There are different scenarios that need to be examined.

1) If LastDateShpd  and ReschDate are not null and ReschDate > LastDateShpd then OnTime has to be "N"

2) If ReschDate is null and ShipDate >  LastDateShpd then OnTime has to be "N"

3) If ReschDate is null and ShipDate <=  LastDateShpd then OnTime has to be "Y"

How would I code the onprint event of the detail section of the form?  Note that OnTime is not a bound field
SteveL13Asked:
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PatHartmanCommented:
You don't say anything about ShipDate being empty so the logic below may be incomplete.  I also added the "Y" part of the first condition since you really need to do "something".
If IsDate(Me.ReschDate) Then
    If IsDate(Me.LastDateShpd ) Then
        If Me.ReschDate > Me.LastDateShpd Then 
            Me.OnTime = "N"
        Else
            Me.OnTime = "Y"
        End If
    End If
Else
        If Me.ShipDate> Me.LastDateShpd Then 
            Me.OnTime = "N"
        Else
            Me.OnTime = "Y"
        End If
End If

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SteveL13Author Commented:
Nice!  Very much appreciated Pat.
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