[Solved] python error: unsupported operand type(s) for -: ‘str’ and ‘str’ [duplicate]

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start_date and stop_date are strings, which don’t support the - operator. If you want to compute their (numerical) difference, define them as integers, i.e. 

start_date = 20151231171500
stop_date = 20151231174500

or cast them to int:

test = int(stop_date) - int(start_date)

Caveat: the difference of these numbers would be 3000, not 30. Not sure why you expect 30.

edit: so much for why you cannot substract a string from a string. To compute the actual time difference between dates, please see Martijn’s answer.

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solved python error: unsupported operand type(s) for -: ‘str’ and ‘str’ [duplicate]