Sub atime123() 
' Application.EnableEvents = False 
Range("Aa21") = 0 
    time0 = Time() 
         time1 = Time() 
  Do While Range("Aa21") <> Range("Ab21") 
time1 = Time() + TimeSerial(0, 0, 1) 
Range("Aa21") = DateDiff("s", time0, time1) 
DoEvents 
Loop 
End Sub 
 
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