code: def to_remind(self, vevent, label=None, priority=None, tags=None, tail=None,
                    sep=" ", postdate=None, posttime=None):
          remind = ['REM']
          trigdates = None
          if hasattr(vevent, 'rrule'):
              trigdates = Remind._parse_rruleset(vevent.rruleset)
          dtstart = vevent.dtstart.value
          if isinstance(dtstart, datetime) and dtstart.tzinfo:
              dtstart = dtstart.astimezone(self._localtz)
          dtend = None
          if hasattr(vevent, 'dtend'):
              dtend = vevent.dtend.value
          if isinstance(dtend, datetime) and dtend.tzinfo:
              dtend = dtend.astimezone(self._localtz)
          if not hasattr(vevent, 'rdate') and not isinstance(trigdates, str):
              remind.append(dtstart.strftime('%b %d %Y').replace(' 0', ' '))
          if postdate:
              remind.append(postdate)
          if priority:
              remind.append('PRIORITY %s' % priority)
          if isinstance(trigdates, list):
              remind.extend(trigdates)
          duration = Remind._event_duration(vevent)
          if type(dtstart) is date and duration.days > 1:
              remind.append('*1')
              if dtend is not None:
                  dtend -= timedelta(days=1)
                  remind.append(dtend.strftime('UNTIL %b %d %Y').replace(' 0', ' '))
          if isinstance(dtstart, datetime):
              remind.append(dtstart.strftime('AT %H:%M').replace(' 0', ' '))
              if posttime:
                  remind.append(posttime)
              if duration.total_seconds() > 0:
                  remind.append('DURATION %d:%02d' % divmod(duration.total_seconds() / 60, 60))
          if hasattr(vevent, 'rdate'):
              remind.append(Remind._parse_rdate(vevent.rdate.value))
          elif isinstance(trigdates, str):
              remind.append(trigdates)
          if hasattr(vevent, 'class'):
              remind.append('TAG %s' % Remind._abbr_tag(vevent.getChildValue('class')))
          if tags:
              remind.extend(['TAG %s' % Remind._abbr_tag(tag) for tag in tags])
          if hasattr(vevent, 'categories_list'):
              for categories in vevent.categories_list:
                  for category in categories.value:
                      remind.append('TAG %s' % Remind._abbr_tag(category))
          remind.append(Remind._gen_msg(vevent, label, tail, sep))
          return ' '.join(remind) + '\n'