Calculate two date difference in secondsΒΆ

Calculate two date difference in seconds.
from datetime import datetime, time

def date_diff_in_seconds(dt2, dt1):
  timedelta = dt2 - dt1
  return timedelta.days * 24 * 3600 + timedelta.seconds

date1 = datetime.strptime('2015-01-01 01:00:00', '%Y-%m-%d %H:%M:%S')
date2 = datetime.now()

print("%d seconds" %(date_diff_in_seconds(date2, date1)))

Output:

74175795 seconds