#read next birthday and display number of days left till next birthday
import datetime
birthday=input("When is your next birthday ['yyyy-mm-dd' format] : ")
birthday=datetime.datetime.strptime(birthday,"%Y-%m-%d").date()
CurrentDay=datetime.date.today()
diff=birthday-CurrentDay
print("There are {0:} day(s) left till your next Birthday".format(diff.days))