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I thought this should be straight forward, but somehow it’s creating problems.

I have 2 date fields.

One to track what date and time work is started the other tracks time and date the work has finished.

Based on those to fields I need to find out how many hours is totally billable.


Though I could just minus the two - but I always seem to either get an #error or NaN


Anyone who can point me in the right direction?

DATETIME_DIFF() works for me:



I’ve used 'hour' as the unit, but maybe you should use minutes and convert to hours to be able to bill the minutes too. I get NaN when a Date is not filled, ¿maybe there is your problem? You could check if there are the dates with IF() to avoid that.


DATETIME_DIFF() works for me:



I’ve used 'hour' as the unit, but maybe you should use minutes and convert to hours to be able to bill the minutes too. I get NaN when a Date is not filled, ¿maybe there is your problem? You could check if there are the dates with IF() to avoid that.


Thank you that works


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