#  BirthdaysStandard.py  Copyright (c) Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-05-04  File created.
#  2022-12-18  Converted to Python 3.

#  This program works in the same way as Birthdays.py, but this is
#  written by using standard Python classes.


from datetime import date

days_of_week  =  ( "Monday", "Tuesday", "Wednesday",
                   "Thursday", "Friday", "Saturday", "Sunday" )

print( "\n Type in your date of birth as YYYY-MM-DD"  \
      "\n Please, use four digits for the year, and" \
      "\n two digits for the month and day:  ", end="" )

given_date_as_string  =  input() 

year_of_birth   =  int( given_date_as_string[ 0 : 4 ] )
month_of_birth  =  int( given_date_as_string[ 5 : 7 ] )
day_of_birth    =  int( given_date_as_string[ 8 : ] )

date_of_birth  =  date( year_of_birth, month_of_birth, day_of_birth )

print( "\n   You were born on a %s"  %  days_of_week[ date_of_birth.weekday() ] )
print( "   Here are your days to celebrate. You are" )

years_to_celebrate  =  10

while  years_to_celebrate  <  80  :

   date_to_celebrate  =  date( year_of_birth  +  years_to_celebrate,
                               month_of_birth,
                               day_of_birth )

   print( "\n   %d years old on %s (%s)"  %  ( years_to_celebrate,
         date_to_celebrate.isoformat(),
         days_of_week[ date_to_celebrate.weekday() ] ), end="" )

   years_to_celebrate  =  years_to_celebrate  +  10

print( "\n" )