#julian2.py
#calculate julian date of any year/month/day input

month_names = {1:"January",2:"February",3:"March",4:"April",5:"May",6:"June",\
               7:"July",8:"Auguust",9:"September",10:"October",11:"November",12:"December"}

day, month, year = map(int,input("Enter day, month, and year in  dd/mm/yyyy format: ").split('/'))

if not 1<=month<=12:
    print( "bogus month.  Bye!")
    quit()
elif not 1<=day<=31:
    print( "bogus day.  Bye!")
    quit()
elif year < 1753:
    print( "Sorry, calendar was wacky before 1753.  Bye!")
    quit()
  
  #test for leapyear.  
  #a year is a leap year if evenly divisible by 4 but not also evenly
  #divisible by 100 unless also evenly divisible by 400.
  #I.e. century years are not normally leap years unless they are also 400
  #years.  1800, 1900, 2100 are not leap years, but 2000 is.
if year%4==0 and year%100!=0 or year%400==0:
    is_leap = True
else:
    is_leap = False

  #test that month day combo is valid.  have already checked that day is <= 31
  #So know that 31 day months are valid.
if month in [4, 6, 9, 11]:  #30 day months
    if day > 30:   #i.e. is 31
        print(month_names[month],"has only 30 days.  Bye!")
        quit()
elif month == 2:   #Feb.    
    if not is_leap and day > 28:   #not a leap year
        print( "February has only 28 days this year.  Bye!")
        quit()
    elif is_leap and day > 29:    #is leap year
        print( "February has only 29 days this year.  Bye!")
        quit()

  #determine the number of days in all the previous months
month_days = [31,28,31,30,31,30,31,31,30,31,30,31]
previousMonthDays = sum(month_days[:month-1])

if month>2 and is_leap:
    previousMonthDays += 1    #Feb 29
  
julian = previousMonthDays + day  #plus this month's day
print(day,month_names[month],year,"is Julian date: ", julian)