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Kopfschlag Author

Level 1

8 points

calculating time using numbers

I want to calculate time taken on a task. The data are: start time, end time, and time in between taken for rest or non-task use. I put down these numbers in cells formatted for time but not date:

B3: start time: 12:30AM

B4: total time off: 0:15

B5: end tine: 8:30 AM

The formula= B:5-B:4-B:3 yielded an error message to the effect that times cannot be subtracted from numbers. As noted: all cells were formatted as time. Also, =B:5-B4 yielded an answer. =B5-B3 also yielded an answer. How do I fix this problem?

MacBook Air 13″, macOS 10.14

Posted on Jul 31, 2020 1:29 PM

Top-ranking reply

Badunit

Level 7

28,288 points

Posted on Jul 31, 2020 7:07 PM

EDITED:

Delete the 0:15 from the one cell. Format the cell as a duration with units of hr:min. Type 15m into the cell. Should work then. Numbers assumed the 0:15 you typed was 12:15 AM (00:15 in military time), not a duration of 15 minutes.

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calculating time using numbers

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