Performing SUM with time data

Hi,
is there a way to sum time data as following?
start_time: 10,15 AM
stop_time: 2,35 PM
I expect to do something like:
=(stop_time - start_time)
but this doesn't work.
Thanks anticipately.

Currently we support arithmetic formulas on 12 hour intervals only, i.e., you can perform the following action (Stop_time - Start_time) for Start_time: 1:00AM and Stop_time: 9:00AM. Tables will display 8:00AM as the result. Please make sure you select "date" as the data type for all the columns associated with this operation.
Thanks,
Varun

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