# Calculating Time Variance

Jan 26, 2009I'm trying to calculate the variance between planned date & time of arrival vs actual date & time of arrival.

I attach the workbook as am a bit useless at explaining myself....

What I've done is in H14 subtract the actual date of arrival (F14) from planned date of arrival (C14). This result is the only way I could think of dealing with crossing over midnight. As a result I14 should subtract the actual time of arrival (E14) from planned time of arrival (B14):

=SUM(E14-B14,H14)

This method works well when the arrival was later than expected but doesn't work if the arrival was sooner than expected.