Project16.py

# Python3 program two find number of
# days between two given dates

# A date has day 'd', month
# 'm' and year 'y'


class Date:
	def __init__(self, d, m, y):
		self.d = d
		self.m = m
		self.y = y


# To store number of days in
# all months from January to Dec.
monthDays = [31, 28, 31, 30, 31, 30,
			31, 31, 30, 31, 30, 31]

# This function counts number of
# leap years before the given date


def countLeapYears(d):

	years = d.y

	# Check if the current year needs
	# to be considered for the count
	# of leap years or not
	if (d.m <= 2):
		years -= 1

	# An year is a leap year if it is a
	# multiple of 4, multiple of 400 and
	# not a multiple of 100.
	ans = int(years / 4)
	ans -= int(years / 100)
	ans += int(years / 400)
	return ans

# This function returns number of
# days between two given dates


def getDifference(dt1, dt2):

	# COUNT TOTAL NUMBER OF DAYS
	# BEFORE FIRST DATE 'dt1'

	# initialize count using years and day
	n1 = dt1.y * 365 + dt1.d

	# Add days for months in given date
	for i in range(0, dt1.m - 1):
		n1 += monthDays[i]

	# Since every leap year is of 366 days,
	# Add a day for every leap year
	n1 += countLeapYears(dt1)

	# SIMILARLY, COUNT TOTAL NUMBER
	# OF DAYS BEFORE 'dt2'
	n2 = dt2.y * 365 + dt2.d
	for i in range(0, dt2.m - 1):
		n2 += monthDays[i]
	n2 += countLeapYears(dt2)

	# return difference between
	# two counts
	return (n2 - n1)


# Driver Code
dob=input("Enter your DOB as DD/MM/YYYY : ")
dob=[int(i) for i in dob.split("/")]
dob=Date(dob[0],dob[1],dob[2])
PD=input("Enter Present Day as DD/MM/YYYY : ")
PD=[int(i) for i in PD.split("/")]
PD=Date(PD[0],PD[1],PD[2])

# Function call
print("\nThe number of days the person is alive:",getDifference(dob, PD))