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Christian Weller Christian Weller is offline
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Default is 0.000000000000000055511151231258=0 in excell?

In excel I am calculating the time difference between two times
I.e. 6:17:36 AM - 6:17:36 AM = 00:00:00 (12:00:00 am depending on formatting)
Sometimes I get 0 , but often get =0.000000000000000055511151231258 or
-0.000000000000000055511151231258 (number format with 30 decimal places)

Any ideas why?