Python. A program is needed that can calculate the number of the day in the year for any given date that is entered in the form of year month day (where year is 4 digits). For example, if the input is 2000 1 1, the day number is 1; if the input is 1918 5 24, the day number is 144; and if the input is 2009 12 25, the day number is 359.

CANNOT USE any importation of datetime, calender, etc.

functions to use =

def main():

def numberOfDays(day, month, year):

def daysInMonth(month,year):

def isLeapYear(year):