code: def in_reminder(client, channel, nick, args):
      
      global _scheduled
  
      amount, quantity = int(args[0][:-1]), args[0][-1]
  
      # Handle ability to specify the channel
      if args[1] == 'on':
          target_channel = args[2]
          message = ' '.join(args[3:])
  
          # Make sure channel is formatted correctly
          if not target_channel.startswith('#'):
              target_channel = '#{0}'.format(target_channel)
      else:
          target_channel = channel
          message = ' '.join(args[1:])
  
      if quantity not in in_seconds_map:
          return u"Sorry I didn't understand '{0}'. You must specify m,h,d. Ex: 12m".format(args[0])
  
      seconds = amount * in_seconds_map[quantity]
      utcnow = datetime.datetime.utcnow().replace(tzinfo=pytz.UTC)
      delta = datetime.timedelta(seconds=seconds)
  
      id = db.reminders.insert({
          'when': utcnow + delta,
          'message': message,
          'channel': target_channel,
          'creator': nick,
      })
  
      _scheduled.add(id)
      reactor.callLater(seconds, _do_reminder, id, client)
      return u'Reminder set for {0} from now'.format(readable_time_delta(seconds))
docs: Create a one-time reminder to occur at some amount of minutes, hours, or days
      in the future. This is used like:
  
          <sduncan> helga in 12h submit timesheet
  
      This will create a reminder 12 hours from now with the message "submit timesheet".
  
      Optionally, a specific channel can be specified to receive the reminder message. This
      is useful if creating several reminders via a private message. To use this, specify
      "on <channel>" between the time amount and the message:
  
          <sduncan> helga in 12h on #bots submit timesheet
          <sduncan> helga in 12h on bots submit timesheet
  
      Note that the '#' char for specifying the channel is entirely optional.