Public Declare PtrSafe Sub Sleep Lib "kernel32" (ByVal milliseconds As Long)

Sub CalculateElapsedTimeInMilliseconds()

    Dim startTime   As Double
    Dim endTime     As Double
    Dim elapsedTime As Double
    Dim message     As String

    startTime = Timer

    Call Sleep(1200) 'Wait 1.2 seconds

    endTime = Timer
    elapsedTime = endTime - startTime

    message = "Time " & elapsedTime & " seconds"

    Debug.Print message 'Time 1.2 seconds

End Sub

Public Declare PtrSafe Sub Sleep Lib "kernel32" (ByVal milliseconds As Long)

Sub CalculateElapsedTimeInMilliseconds()

    Dim startTime   As Double
    Dim endTime     As Double
    Dim elapsedTime As Double
    Dim message     As String

    startTime = Timer

    Call Sleep(1200) 'Wait 1.2 seconds

    endTime = Timer
    elapsedTime = endTime - startTime

    message = "Time "
    message = message & Format(Int((elapsedTime) / 60 / 60), "00") & ":"            'Hour
    message = message & Format(Int((elapsedTime) / 60) Mod 60, "00") & ":"          'Minute
    message = message & Format(Int(elapsedTime) Mod 60, "00") & "."                 'Second
    message = message & Format(Int((elapsedTime - Int(elapsedTime)) * 1000), "000") 'Millisecond

    Debug.Print message 'Time 00:00:01.200

End Sub

Public Declare PtrSafe Sub Sleep Lib "kernel32" (ByVal milliseconds As Long)

Sub CalculateElapsedTimeInSeconds()

    Dim startTime   As Date
    Dim endTime     As Date
    Dim elapsedTime As Date
    Dim message     As String

    startTime = Now

    Call Sleep(3000) 'Wait 3 seconds

    endTime = Now

    elapsedTime = endTime - startTime

    message = "Time " & Format(elapsedTime, "hh:mm:ss")

    Debug.Print message 'Time 00:00:03

End Sub