Dim s As Long
Dim x As Integer
Dim y As Integer
Dim c As String
a = "1:32:45"
b = "1:45:52"
s = Abs(DateDiff("s", TimeValue(a), TimeValue(b)))
x = s - Int(s / 60) * 60
s = Int(s / 60)
y = s - Int(s / 60) * 60
s = Int(s / 60)
c = Str(s) & ":" & Str(y) & ":" & Str(x)
Print c