Day of the week

gistfile1.py

#!/usr/bin/env python
COMMON_YEAR_DAYS =365
LEAP_YEAR_DAYS = 366
days_in_months = {0:0,1:31,2:28,3:31,4:30,5:31,6:30,7:31,8:31,9:30,10:31,11:30,12:31}
giorni = ['monday','tuesday','wednsday','thursday','friday','saturday','sunday']

def is_it_leap(year):
    return year%4 == 0 and not year%100 == 0 or year%400 ==0

def day_of_the_week(year,month,day):
    distance = 0
    for current_year in range(1,year):
        if is_it_leap(current_year):
            distance+=LEAP_YEAR_DAYS
        else:
            distance+=COMMON_YEAR_DAYS
    for current_month in range(0,month):
        if is_it_leap(year) and current_month == 2:
            distance+=days_in_months[current_month]+1
        else:
            distance+=days_in_months[current_month]
    distance+=day-1
    return distance

if __name__ == "__main__":
    giorno = int(raw_input('Giorno:'))
    mese = int(raw_input('Mese:'))
    anno = int(raw_input('Anno:'))

    dow = day_of_the_week(anno,mese,giorno)

    print "Distanza in giorni: %i" % dow
    print "Giorno della settimana: %s" % giorni[dow%7]