how to convert time in python code example

Example 1: how calculate time in python

import time
start = time.process_time()
# your code here    
print(time.process_time() - start)

Example 2: converting datetime object format to datetime format python

df['date_time']=pd.to_datetime(df['date_time'], format='%d-%m-%Y %H.%M.%S')
#fomrat given in code should match the format of the feature
#here--> df['date_time'][0]=10-03-2004 18.00.00
#watchout for the blanks  '-' '.'