Show date format in help message in my_activity.py

my_activity.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Get stats about your activity.
 
 Example:
   - my_activity.py  for stats for the current week (last week on mondays).
   - my_activity.py -Q  for stats for last quarter.
@@ skipping 688 matching lines @@
   # Silence upload.py.
   rietveld.upload.verbosity = 0
 
   parser = optparse.OptionParser(description=sys.modules[__name__].__doc__)
   parser.add_option(
       '-u', '--user', metavar='<email>',
       default=os.environ.get('USER'),
       help='Filter on user, default=%default')
   parser.add_option(
       '-b', '--begin', metavar='<date>',
-      help='Filter issues created after the date')
+      help='Filter issues created after the date (mm/dd/yy)')
   parser.add_option(
       '-e', '--end', metavar='<date>',
-      help='Filter issues created before the date')
+      help='Filter issues created before the date (mm/dd/yy)')
   quarter_begin, quarter_end = get_quarter_of(datetime.today() -
                                               relativedelta(months=2))
   parser.add_option(
       '-Q', '--last_quarter', action='store_true',
       help='Use last quarter\'s dates, i.e. %s to %s' % (
         quarter_begin.strftime('%Y-%m-%d'), quarter_end.strftime('%Y-%m-%d')))
   parser.add_option(
       '-Y', '--this_year', action='store_true',
       help='Use this year\'s dates')
   parser.add_option(
       '-w', '--week_of', metavar='<date>',
-      help='Show issues for week of the date')
+      help='Show issues for week of the date (mm/dd/yy)')
   parser.add_option(
       '-W', '--last_week', action='count',
       help='Show last week\'s issues. Use more times for more weeks.')
   parser.add_option(
       '-a', '--auth',
       action='store_true',
       help='Ask to authenticate for instances with no auth cookie')
 
   activity_types_group = optparse.OptionGroup(parser, 'Activity Types',
                                'By default, all activity will be looked up and '
@@ skipping 124 matching lines @@
   my_activity.print_issues()
   return 0
 
 
 if __name__ == '__main__':
   try:
     sys.exit(main())
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)