# A client program that deals with dates.
# Fourth version, to accompany Date class with properties.

from Date import *

def main():
    # create three Date objects
    d1 = Date(9, 19)
    d2 = Date(7, 31)

    # advance each date and print its state
    print("d1 month is", d1.month)
    print("d1 day is", d1.day)
    
    # try to change month property value (will raise error)
    try:
        d1.month = 13
        print("d1 month is", d1.month)
    except ValueError:
        print("Oops, can't set month to 13")
    
    print("d2 is", d2)
    d1.advance()
    d2.advance()
    print("d1 is", d1)
    print("d2 is", d2)

main()