Time intervals using VBA in Microsoft Excel

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» Time intervals using VBA in Microsoft Excel

VBA macro tip contributed by Erlandsen Data Consulting* offering Microsoft Excel Application development, template customization, support and training solutions*

CATEGORY: Custom Functions , Printing in VBA	VERSIONS: All Microsoft Excel Versions

If you need to calculate the difference between two time values within a certain limit
(e.g. when calculating elapsed work time), the worksheet function below can be useful
since it makes it simple to perform the time interval calculation.

Function TimeInterval(StartTime As Double, EndTime As Double, _
    LowerLimit As Double, UpperLimit As Double) As Double
' returns EndTime-StartTime limited by LowerLimit and UpperLimit
    TimeInterval = 0
    If StartTime > EndTime Then Exit Function
    If StartTime > UpperLimit Then Exit Function
    If EndTime < LowerLimit Then Exit Function
    If StartTime < LowerLimit Then StartTime = LowerLimit
    If EndTime > UpperLimit Then EndTime = UpperLimit
    TimeInterval = EndTime - StartTime
End Function

Example:
The examples below assumes that you have a start time in cell A1 and an end time in cell B1.
=TimeInterval(A1;B1;0;8/24) returns the elapsed time within 00:00 and 08:00 (0 = 00:00)
=TimeInterval(A1;B1;8/24;16/24) returns the elapsed time within 08:00 and 16:00
=TimeInterval(A1;B1;16/24;1) returns the elapsed time within 16:00 and 24:00 (1 = 24:00)

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