Date Time Python

import calendar
import math

class Date(object):
    def __init__(self, day, month, year, hour, minute, second, zone):
        self.day = day
        self.month = month
        self.year = year
        self.hour = hour
        self.minute = minute
        self.second = second
        self.zone = zone

    def print(self):
        print(self.hour, self.minute, self.second)

    def from_start(self):
        monthDate = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
        if calendar.isleap(self.year):
            monthDate[1] += 1
        days = 0;
        for i in range(1, self.year):
            days += 365
            if calendar.isleap(i):
                days += 1
        for i in range(1, self.month):
            days += monthDate[i - 1];
        days += self.day - 1;
        return days

    def __sub__(self, date2):
        result = abs(self.from_start() - date2.from_start()) * 86400
        print(result)
        result -= date2.hour * 3600 + date2.minute * 60 + date2.second;
        result += self.hour * 3600 + self.minute * 60 + self.second;
        return result

    def get_days_of_month(self, month, year):
        monthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
        if calendar.isleap(year):
            monthDays[1] += 1
        return monthDays[month - 1]

    def get_tomorrow(self):
        self.hour -= 24
        days = self.get_days_of_month(self.month, self.year)
        self.day += 1
        if self.day > days:
            self.day = 1
            self.month += 1
        if self.month > 12:
            self.year += 1
            self.month = 1

    def get_yesterday(self):
        self.hour += 24
        self.day -= 1
        if self.day < 1:
            self.month -= 1
            if self.month < 1:
                self.month = 12
                self.year -= 1
            self.day = self.get_days_of_month(self.month, self.year)

    def to_GMT(self):
        if self.zone.startswith("-"):
            self.hour += int(self.zone[1:3])
            self.minute += int(self.zone[3:5])
            if self.minute >= 60:
                self.hour += 1
                self.minute -= 60
            if self.hour >= 24:
                self.get_tomorrow()
        else:
            self.hour -= int(self.zone[1:3])
            self.minute -= int(self.zone[3:5])
            if self.minute < 0:
                self.hour -= 1
                self.minute += 60
            if self.hour < 0:
                self.get_yesterday()

def change(arr):
    # Sun 10 May 2015 13:54:36 -0700
    #  0   1  2   3       4       5
    month = ["", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
    arr[1] = int(arr[1])
    arr[2] = month.index(arr[2])
    arr[3] = int(arr[3])
    zone = arr.pop()
    time = map(int, arr.pop().split(":"))
    for item in time:
        arr.append(item)
    arr.append(zone)
    arr = arr[1:]
    return arr

def is_later(date1, date2):
    if (date1.year > date2.year):
        return 2
    elif (date1.year < date2.year):
        return 0
    else:
        if (date1.month > date2.month):
            return 2
        elif (date1.month < date2.month):
            return 0
        else:
            if (date1.day > date2.day):
                return 2
            elif (date1.day < date2.day):
                return 0
            else:
                if (date1.hour > date2.hour):
                    return 2
                elif (date1.hour < date2.hour):
                    return 0
                else:
                    if (date1.minute > date2.minute):
                        return 2
                    elif (date1.minute < date2.minute):
                        return 0
                    if (date1.second > date2.second):
                        return 2
                    elif (date1.second < date2.second):
                        return 0
                    else:
                        return 1

s1 = change(input().split())
s2 = change(input().split())

date1 = Date(*s1)
date2 = Date(*s2)

date1.to_GMT()
date2.to_GMT()

if is_later(date2, date1):
    sec = (date2 - date1)
else:
    sec = (date1 - date2)

print(sec)