Using Python Script we add and subtract the Dates in VMS platform
#-----------------------------
# Adding to or Subtracting from a Date
# Use the rather nice datetime.timedelta objects
now = datetime.date(2003, 8, 6)
difference1 = datetime.timedelta(days=1)
difference2 = datetime.timedelta(weeks=-2)
print "One day in the future is:", now + difference1
#=> One day in the future is: 2003-08-07
print "Two weeks in the past is:", now + difference2
#=> Two weeks in the past is: 2003-07-23
print datetime.date(2003, 8, 6) - datetime.date(2000, 8, 6)
#=> 1095 days, 0:00:00
#-----------------------------
birthtime = datetime.datetime(1973, 01, 18, 3, 45, 50) # 1973-01-18 03:45:50
interval = datetime.timedelta(seconds=5, minutes=17, hours=2, days=55)
then = birthtime + interval
print "Then is", then.ctime()
#=> Then is Wed Mar 14 06:02:55 1973
print "Then is", then.strftime("%A %B %d %I:%M:%S %p %Y")
#=> Then is Wednesday March 14 06:02:55 AM 1973
#-----------------------------
when = datetime.datetime(1973, 1, 18) + datetime.timedelta(days=55)
print "Nat was 55 days old on:", when.strftime("%m/%d/%Y").lstrip("0")
#=> Nat was 55 days old on: 3/14/1973
