Python program to find number of days between two given dates

# 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.
    return int(years / 4) - int(years / 100) + int(years / 400)


# 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 program
dt1 = Date(13, 12, 2018)
dt2 = Date(25, 2, 2019)

print(getDifference(dt1, dt2), "days")

# Python3 program to find number of days
# between two given dates
from datetime import date


def numOfDays(date1, date2):
  #check which date is greater to avoid days output in -ve number
    if date2 > date1:   
        return (date2-date1).days
    else:
        return (date1-date2).days


# Driver program
date1 = date(2018, 12, 13)
date2 = date(2015, 2, 25)
print(numOfDays(date1, date2), "days")

from dateutil import relativedelta
from datetime import datetime

# Parse the dates from strings into datetime objects
date1 = datetime.strptime("13/10/2018", "%d/%m/%Y")
date2 = datetime.strptime("25/12/2018", "%d/%m/%Y")

# Calculate the difference between the two dates
difference = relativedelta.relativedelta(date2, date1)
# Print the number of days between the two dates
print(difference.months, "months", difference.days, "days")

# This code is contributed by Edula Vinay Kumar Reddy

import time


def days_between_dates(dt1, dt2):
    date_format = "%d/%m/%Y"
    a = time.mktime(time.strptime(dt1, date_format))
    b = time.mktime(time.strptime(dt2, date_format))
    delta = b - a
    return int(delta / 86400)


dt1 = "13/12/2018"
dt2 = "25/2/2019"
print(days_between_dates(dt1, dt2))

from datetime import date
from functools import reduce


def numOfDays(date1, date2):
    return reduce(lambda x, y: (y-x).days, [date1, date2])


date1 = date(2018, 12, 13)
date2 = date(2019, 2, 25)
print(numOfDays(date1, date2), "days")

# This code is contributed by Jyothi pinjala