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> import datetime
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<             
---
>     
>     def canonical_date(self, arg) :
>         """
>         Transform "arg" in a valid yyyy-mm-dd date or return None.
>         "arg" can be a yyyy-mm-dd, yyyymmdd, mmdd, today or a weekday name.
>         """
>         day_names_en = ["monday", "tuesday", "wednesday", "thursday",
>                         "friday", "saturday", "sunday"]
>         if re.match(r'\d{4}-\d{2}-\d{2}', arg) :
>             date = arg
>         elif arg.isdigit() :
>             if len(arg) == 8 :
>                 date = "%s-%s-%s" % (arg[:4],arg[4:6],arg[6:])
>             elif len(arg) == 4 :
>                 year = datetime.date.today().year
>                 date = "%i-%s-%s" % (year,arg[:2],arg[2:])
>         elif arg.lower() == "today" :
>             today = datetime.date.today()
>             year = today.year
>             month = today.month
>             day = today.day
>             date = "%i-%i-%i" % (year,month,day)
>         elif arg.lower() in day_names_en :
>             today = datetime.date.today()
>             today_day = today.weekday()
>             arg_day = day_names_en.index(arg)
>             if arg_day > today_day :
>                 delta = datetime.timedelta(days = arg_day-today_day)
>             else :
>                 delta = datetime.timedelta(days = arg_day-today_day+7)
>             next_date = today + delta
>             year = next_date.year
>             month = next_date.month
>             day = next_date.day
>             date = "%i-%i-%i" % (year,month,day)
>         else :
>             return None
>         if self.is_date_valid(date) :
>             return date
>         else :
>             return None
>     
>     def is_date_valid(self, fulldate) :
>         """
>         Return True if the date exists. False else.
>         "fulldate" is yyyy-mm-dd
>         """
>         splited_date = fulldate.split("-")
>         if len(splited_date) != 3 :
>             return False
>         year,month,day = splited_date
>         try :
>             date = datetime.date(int(year),int(month),int(day))
>         except ValueError :
>             return False
>         else :
>             return True
>     
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>         due_date = None
>         defer_date = None
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<                 # Here you can add new commands
<                 #elif attribute.lower() == "defer" :
<                 #elif attribute.lower() == "due" :
---
>                 elif attribute.lower() == "defer" :
>                     defer_date = self.canonical_date(args)
>                     if defer_date is None :
>                         valid_attribute = False
>                 elif attribute.lower() == "due" :
>                     due_date = self.canonical_date(args)
>                     if due_date is None :
>                         valid_attribute = False
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>             if not due_date is None :
>                 task.set_due_date(due_date)
>             if not defer_date is None :
>                 task.set_start_date(defer_date)