from datetime import datetime, time  
def date_diff_in_Seconds(dt2, dt1):  
  timedelta = dt2 - dt1  
  return timedelta.days * 24 * 3600 + timedelta.seconds  
#Specified date  
date1 = datetime.strptime('2015-01-01 01:00:00', '%Y-%m-%d %H:%M:%S')  
#Current date  
date2 = datetime.now()  
print("\n%d seconds" %(date_diff_in_Seconds(date2, date1)))  
print()