# Filename: age2.py
# Author: Mark Williams
 
#Do all the module imports first
import datetime
 
#Just a Def to all up to convert strings to UPPERCASE
def to_upper(string):
    upper_case = ""
    for character in string:
        if 'a' <= character <= 'z':
            location = ord(character) - ord('a')
            new_ascii = location + ord('A')
            character = chr(new_ascii)
        upper_case = upper_case + character
    return upper_case
#End of Def here.
 
#Next we'll import the date from that module we loaded.
from datetime import date
 
#And put the date today in a variable
now = date.today()
 
#Then we'll make a seperate variable for each 'piece'
#of the date for manipulation
 
#Yeah, YEAR input now with error checking
error_var = 0
while error_var == 0:
	y = int(raw_input('Please enter the YEAR of which you were born:    '))
	if y >= 2009:
		print "Error, you're not born yet! Try again."
	elif y < 0:
		print "Error, no way we're you born BC!"
	else:
		error_var = 1
 
#Next is Month input with error checking for both integer input
#and for string input.
error_val = 0
while error_val == 0:
	m = raw_input('Please enter the MONTH of which you were born:   ')
	try:
    		dummy = int(m)
	    	#error checking on the input number (as it was given as an integer)
		m = int (m)
		if m < 1 or m > 12:
		    	print "Error? That's not a month!"
	    	else:
		    	error_val = 1
	except:
		m = to_upper(m)[:3]
		#Convert the string version to an integer version
		#Lots of "error_val..." here, might take a look at
		#removing these somehow.
		if m == "JAN":
			m = 1
		elif m == "FEB":
			m = 2
			error_val = 1
		elif m == "MAR":
			m = 3
			error_val = 1
		elif m == "APR":
			m = 4
			error_val = 1
		elif m == "MAY":
			m = 5
			error_val = 1
		elif m == "JUN":
			m = 6
			error_val = 1
		elif m == "JUL":
			m = 7
			error_val = 1
		elif m == "AUG":
			m = 8
			error_val = 1
		elif m == "SEP":
			m = 9
			error_val = 1
		elif m == "OCT":
			m = 10
			error_val = 1
		elif m == "NOV":
			m = 11
			error_val = 1
		elif m == "DEC":
			m = 12
			error_val = 1
		else:
			print "\nError, didn't get which month you meant there either \n\
enter it as an integer (1 to 12) or type the month name out, \n\
either as an abbreviation (Jan, Feb, Mar...) or in \n\
full (January, February...)\n"
 
#Day input, again with error checking
error_var = 0
while error_var == 0:
	d = int(raw_input('Please enter the DAY on which you were born:     '))
	if d < 1 or d > 32:
		print "Error, what DAY did you say?"
	else:
		error_var = 1
 
#Added here so as to not double commands
d = int(d)
m = int(m)
y = int(y)
 
#Put the input-ed date into a single variable
birthday = date(y, m, d)
#Work out the persons age
age = now - birthday
#Convert that to years (allowing for leap years too
years = age.days / 365.25
#Convert it to months also
months = age.days / 12
 
## Output the data!
print "\nToday, your are:\n\n"
print age.days, " days"
print months, " months"
print "or"
print int(years), " years old!"
 
#Now just for fun we'll play with some list stuff
#I'll try and make it look neat and 'readable' too.
a = [\
'January',\
'February',\
'March',\
'April',\
'May',\
'June',\
'July',\
'August',\
'September',\
'October',\
'November',\
'December']
#Prepare 'm' for 'a'
m = m - 1
#Add the 'st', 'nd', 'rd' or 'th' bit to the day!
if d == 1 or d == 21 or d == 31:
	d = str(d) + 'st'
elif d == 2 or d == 22 or d == 32:
	d = str(d) + 'nd'
elif d == 3 or d == 23:
	d = str(d) + 'rd'
elif d > 3 and d <= 20 or d >23 and d <= 30:
	d = str(d) + 'th'
print "\n\nAlso I can tell you that you were born on: ", d, a[m], y
#That's all folks!

while True:
    try:
       year = int(raw_input("What year were you born? "))
   except:
       print "enter an integer, please!"
       continue
   if year < 0: 
       print "Impossible!  You weren't born BC!"
   elif year > now.year:  # << Note dynamic checking!
      print "Impossible!  You aren't born in the future!"
   else:
      break

def get_month():
   months = ["JAN","FEB","MAR",etc.]
   while True:
       month = raw_input("What month were you born? ")
       month = month[:3].upper()
       if month in months:
          return months.index(month) + 1
       else:
          try:
              month = int(month)
              if 0 < month < 13:
                   return month
              else:
                   print "invalid month!"
                   continue
          except:
               print "invalid month!"

def extract_date(s):
    try:
        date = datetime.datetime.strptime(s, "%d %m %Y")
    except:
        try:
            date = datetime.datetime.strptime(s, "%d %b %Y")
	except:
	    return None
    return date
 
while True:
   year = raw_input("What year were you born? ")
   month = raw_input("What month were you born? ")
   day = raw_input("What day were you born? ")
   bday = extract_date(day + " " + month[:3].title() + " "+ year)
   if bday == None:
      print "Illegal info!"
      continue
   else:
      break

elif year > now.year: # << Note dynamic checking!

# a more secure way to enter a date
 
import datetime as dt
 
def enter_date():
    """
    asks to enter year, month and day and returns
    date info as <type 'datetime.datetime'>
    """
    def extract_date(s):
        try:
            # month given as a decimal number
            date = dt.datetime.strptime(s, "%d %m %Y")
        except:
            try:
                # month given as a 3 letter abreviation
                date = dt.datetime.strptime(s, "%d %b %Y")
            except:
                return None
        return date
 
    while True:
        year = raw_input("Enter year (eg. 1979): ")
        # you can enter number of month, full name or 3 letter abbreviation
        month = raw_input("Enter month (eg. 9 or sep): ")
        day = raw_input("Enter the day of the month: ")
        date = extract_date(day + " " + month[:3].title() + " " + year)
        if date == None:
            print "Illegal info!"
            continue
        else:
            return date
 
 
date = enter_date()
 
# testing ...
#print date, type(date)           # 2001-09-11 00:00:00 <type 'datetime.datetime'>
#print date.strftime("%m/%d/%Y")  # 09/11/2001
#print date.strftime("%d%b%Y")    # 11Sep2001
 
# do something with it ...
today = dt.datetime.today()
age = today - date
# assumes week starts with Monday
weekdays = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
week_day = weekdays[dt.date.weekday(date)]
print "Today is %s" % today.strftime("%d%b%Y")
print "%s was %d days ago on a %s" % (date.strftime("%d%b%Y"), age.days, week_day)
 
"""
my output -->
Enter year (eg. 1979): 2001
Enter month (eg. 9 or sep): september
Enter the day of the month: 11
Today is 03Mar2008
11Sep2001 was 2365 days ago on a Tuesday
"""