# Hint:  use Google to find python function

from datetime import datetime

date_start = '01-02-2013'    
date_stop = '07-28-2015'

d1 = datetime.strptime(date_start, '%m-%d-%Y')
d2 = datetime.strptime(date_stop, '%m-%d-%Y')

diff = d2 - d1
print diff

date_start = '12312013'  
date_stop = '05282015'

d1 = datetime.strptime(date_start, '%m%d%Y')
d2 = datetime.strptime(date_stop, '%m%d%Y')

diff = d2 - d1
print diff

date_start = '15-Jan-1994'      
date_stop = '14-Jul-2015'

d1 = datetime.strptime(date_start, '%d-%b-%Y')
d2 = datetime.strptime(date_stop, '%d-%b-%Y')

diff = d2 - d1
print diff
