Weird problem adding times using 1904


Board Regular
Oct 5, 2007
Columns B,D,F,H,J,L and N are positive times in hh:mm format - basically the amount of time someone worked overtime for each day of the week. So if Bob stayed an hour and 45 minutes late on Monday, D3 would be 01:45.

Columns C,E,G,I,K,M and O are the times people left early on those same days. So if Bob left 3 hours early on Saturday, O3 would be 03:00.

In column P I do a weekly total like this:

I don't show zeros so if the total of the overtime and leaving early is zero the cell in column P is blank. The math works fine but some some reason, certain values in B though O that equal zero are displayed in P as 00:00 rather than displaying a blank cell. I have 1904 time values turned on.

D=01:45 'overtime
F=00:45 'overtime
H=00:15 'overtime
K=00:15 'left early
0=03:00 'left early

I can plug in other numbers that equal zero in the same row and P is blank. This is really confusing. It's got to have something to do with which time values I'm adding and subtracting, but what??????

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Excel Facts

How to total the visible cells?
From the first blank cell below a filtered data set, press Alt+=. Instead of SUM, you will get SUBTOTAL(9,)


Well-known Member
Feb 13, 2007
Your problem is that the sum of overtime is greater than 1 hour. I'm not smart enough to tell you WHY that is but I had the same problem. Never could figure out a way to fix it. Something is happening when you subtract times that are over 60 minutes.

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