Initial revision

diff --git a/Demo/scripts/unbirthday.py b/Demo/scripts/unbirthday.py
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+++ b/Demo/scripts/unbirthday.py
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+#! /usr/local/bin/python
+
+# Calculate your unbirthday count (see Alice in Wonderland).
+# This is defined as the number of days from your birth until today
+# that weren't your birthday.  (The day you were born is not counted).
+# Leap years make it interesting.
+
+import sys
+import time
+import calendar
+
+def main():
+       # Note that the range checks below also check for bad types,
+       # e.g. 3.14 or ().  However syntactically invalid replies
+       # will raise an exception.
+       if sys.argv[1:]:
+               year = eval(sys.argv[1])
+       else:
+               year = input('In which year were you born? ')
+       if year in range(100):
+               print 'I\'ll assume that by', year,
+               year = year + 1900
+               print 'you mean', year, 'and not the arly Christian era'
+       elif year not in range(1850, 2000):
+               print 'It\'s hard to believe you were born in', year
+               return
+       #
+       if sys.argv[2:]:
+               month = eval(sys.argv[2])
+       else:
+               month = input('And in which month? (1-12) ')
+       if month not in range(1, 13):
+               print 'There is no month numbered', month
+               return
+       #
+       if sys.argv[3:]:
+               day = eval(sys.argv[3])
+       else:
+               day = input('And on what day of that month? (1-31) ')
+       if month == 2 and calendar.isleap(year):
+               maxday = 29
+       else:
+               maxday = calendar.mdays[month]
+       if day not in range(1, maxday+1):
+               print 'There are no', day, 'days in that month!'
+               return
+       #
+       bdaytuple = (year, month, day)
+       bdaydate = mkdate(bdaytuple)
+       print 'You were born on', format(bdaytuple)
+       #
+       todaytuple = time.localtime(time.time())[:3]
+       todaydate = mkdate(todaytuple)
+       print 'Today is', format(todaytuple)
+       #
+       if bdaytuple > todaytuple:
+               print 'You are a time traveler.  Go back to the future!'
+               return
+       #
+       if bdaytuple == todaytuple:
+               print 'You were born today.  Have a nice life!'
+               return
+       #
+       days = todaydate - bdaydate
+       print 'You have lived', days, 'days'
+       #
+       age = 0
+       for y in range(year, todaytuple[0] + 1):
+               if bdaytuple < (y, month, day) <= todaytuple:
+                       age = age + 1
+       #
+       print 'You are', age, 'years old'
+       #
+       if todaytuple[1:] == bdaytuple[1:]:
+               print 'Congratulations!  Today is your', nth(age), 'birthday'
+               print 'Yesterday was your',
+       else:
+               print 'Today is your',
+       print nth(days - age), 'unbirthday'
+
+def format((year, month, day)):
+       return '%d %s %d' % (day, calendar.month_name[month], year)
+
+def nth(n):
+       if n == 1: return '1st'
+       if n == 2: return '2nd'
+       if n == 3: return '3rd'
+       return '%dth' % n
+
+def mkdate((year, month, day)):
+       # Januari 1st, in 0 A.D. is arbitrarily defined to be day 1,
+       # even though that day never actually existed and the calendar
+       # was different then...
+       days = year*365                 # years, roughly
+       days = days + (year+3)/4        # plus leap years, roughly
+       days = days - (year+99)/100     # minus non-leap years every century
+       days = days + (year+399)/400    # plus leap years every 4 centirues
+       for i in range(1, month):
+               if i == 2 and calendar.isleap(year):
+                       days = days + 29
+               else:
+                       days = days + calendar.mdays[i]
+       days = days + day
+       return days
+
+main()