Python Date

def time_delta(first_date, second_date):
    first_date = first_date.split('.')
    second_date = second_date.split('.')

    monthDays = [31, 28, 31, 30, 31, 30,
             31, 31, 30, 31, 30, 31]

    def countLeapYears(d):

        years = int(d[2])

        if (int(d[1]) <= 2):
            years -= 1

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

    def getDifference(dt1, dt2):

        n1 = int(dt1[2]) * 365 + int(dt1[0])

        for i in range(0, int(dt1[1]) - 1):
            n1 += monthDays[i]

        n1 += countLeapYears(dt1)

        n2 = int(dt2[2]) * 365 + int(dt2[0])
        for i in range(0, int(dt2[1]) - 1):
            n2 += monthDays[i]
        n2 += countLeapYears(dt2)

        return abs(n2 - n1)

    print(getDifference(first_date, second_date))

time_delta('10.4.2021', '7.4.2021')