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      1 #! /usr/bin/env python
      2 
      3 # Calculate your unbirthday count (see Alice in Wonderland).
      4 # This is defined as the number of days from your birth until today
      5 # that weren't your birthday.  (The day you were born is not counted).
      6 # Leap years make it interesting.
      7 
      8 import sys
      9 import time
     10 import calendar
     11 
     12 def main():
     13     if sys.argv[1:]:
     14         year = int(sys.argv[1])
     15     else:
     16         year = int(raw_input('In which year were you born? '))
     17     if 0 <= year < 100:
     18         print "I'll assume that by", year,
     19         year = year + 1900
     20         print 'you mean', year, 'and not the early Christian era'
     21     elif not (1850 <= year <= time.localtime()[0]):
     22         print "It's hard to believe you were born in", year
     23         return
     24 
     25     if sys.argv[2:]:
     26         month = int(sys.argv[2])
     27     else:
     28         month = int(raw_input('And in which month? (1-12) '))
     29     if not (1 <= month <= 12):
     30         print 'There is no month numbered', month
     31         return
     32 
     33     if sys.argv[3:]:
     34         day = int(sys.argv[3])
     35     else:
     36         day = int(raw_input('And on what day of that month? (1-31) '))
     37     if month == 2 and calendar.isleap(year):
     38         maxday = 29
     39     else:
     40         maxday = calendar.mdays[month]
     41     if not (1 <= day <= maxday):
     42         print 'There are no', day, 'days in that month!'
     43         return
     44 
     45     bdaytuple = (year, month, day)
     46     bdaydate = mkdate(bdaytuple)
     47     print 'You were born on', format(bdaytuple)
     48 
     49     todaytuple = time.localtime()[:3]
     50     todaydate = mkdate(todaytuple)
     51     print 'Today is', format(todaytuple)
     52 
     53     if bdaytuple > todaytuple:
     54         print 'You are a time traveler.  Go back to the future!'
     55         return
     56 
     57     if bdaytuple == todaytuple:
     58         print 'You were born today.  Have a nice life!'
     59         return
     60 
     61     days = todaydate - bdaydate
     62     print 'You have lived', days, 'days'
     63 
     64     age = 0
     65     for y in range(year, todaytuple[0] + 1):
     66         if bdaytuple < (y, month, day) <= todaytuple:
     67             age = age + 1
     68 
     69     print 'You are', age, 'years old'
     70 
     71     if todaytuple[1:] == bdaytuple[1:]:
     72         print 'Congratulations!  Today is your', nth(age), 'birthday'
     73         print 'Yesterday was your',
     74     else:
     75         print 'Today is your',
     76     print nth(days - age), 'unbirthday'
     77 
     78 def format((year, month, day)):
     79     return '%d %s %d' % (day, calendar.month_name[month], year)
     80 
     81 def nth(n):
     82     if n == 1: return '1st'
     83     if n == 2: return '2nd'
     84     if n == 3: return '3rd'
     85     return '%dth' % n
     86 
     87 def mkdate((year, month, day)):
     88     # January 1st, in 0 A.D. is arbitrarily defined to be day 1,
     89     # even though that day never actually existed and the calendar
     90     # was different then...
     91     days = year*365                  # years, roughly
     92     days = days + (year+3)//4        # plus leap years, roughly
     93     days = days - (year+99)//100     # minus non-leap years every century
     94     days = days + (year+399)//400    # plus leap years every 4 centirues
     95     for i in range(1, month):
     96         if i == 2 and calendar.isleap(year):
     97             days = days + 29
     98         else:
     99             days = days + calendar.mdays[i]
    100     days = days + day
    101     return days
    102 
    103 if __name__ == "__main__":
    104     main()
    105