splitting up long number

[snippsat]

>>> # pip install python-dateutil
>>> from dateutil import parser
>>> dt = parser.parse('144345.20)
>>> print(dt)
2016-12-07 14:43:45.200000
>>> dt.hour
14

so I am trying to get it into a format where I can subtract the start time from the end time to give a run time, but I can't work out how to do it. 

Something like this?

import time

def time_code():
    start = time.clock()
    time.sleep(5)
    end = time.clock()
    print('Code time {:.2f} seconds'.format(end - start))

time_code() # Code time 5.00 seconds

There also timeit that is used to measure code.