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Case Study - Time difference calculation after midnight


Real Life Problem:

In a security monitoring control room, In-Charge needs to calculate the start time and end time after a video is observing. But the time calculation is not showing correctly after the midnight. Assume that, the Starting Time is: 23:00:00 PM (11:00:00 PM) and ending time is after midnight (that means next date): 00:37:00 AM (12:37:00 AM). Now the question is how to find the time difference in between in these times?


Example Data Table:

As the problem already provided the time, so assume that, below is the data:

Image 1: Example Data

Now how to calculate the estimated time in E2 Cell?


Solution:

To calculate in a clear way I have created 3 extra columns. First C column Numerical Difference simply calculates the difference from Starting Time to Ending Time. We know that in Computer ending time or latest time or date is always bigger in numerical value then starting time or date. So, I have just used the below formula for C2 cell:

=B2-A2

And it returns the result -0.932638888888889 as below image:

Image 2: Understanding the logic of time difference

Now, as we know that Ending Time will never be negative then Starting Time, then in D2 cell I've tested another calculation which is +1 added to Ending Time to make it bigger than Starting Time. The formula is:

=B2-A2+1

And it shown the result 0.0673611111111111 as below image:

Image 3: Time difference with +1

Actually I have already got the result in D2 cell which is 0.0673611111111111. But the fact is it is in Number mode. If I change the Cell Formatting as HH:MM:SS then it would return 01:37:00 which I have done in E2 cell as below image with the formula is:

=TEXT(B2-A2+1,"HH:MM:SS")

Image 4: The Result

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