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3 Switches and the total data-logged time on.

Question asked by Æthernaut on Aug 27, 2010
Latest reply on Aug 27, 2010 by Æthernaut

Title

3 Switches and the total data-logged time on.

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Hey Forum,

Here is a brainteaser.  Imagine three virtual switches that are either turned on or off at different times throughout the day; their changes in state are time-stamped/data-logged.  And there is also a function that will sum up the total minutes for which, at least, one switch is on (but it will only count overlapping times from multiple-on switches once). 

What is the best way to perform this calculation, as well as to log on/off times for these switches?

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