How to use the khal.parse_datetime.guessrangefstr function in khal

default_timedelta_datetime=dt.timedelta(hours=1)):
    """
    convert a string description of a daterange into start and end datetime

    if no description is given, return (today, today + default_timedelta_date)

    :param daterange: an iterable of strings that describes `daterange`
    :type daterange: tuple
    :param locale: locale settings
    :type locale: dict
    """
    if not daterange:
        start = dt.datetime(*dt.date.today().timetuple()[:3])
        end = start + default_timedelta_date
    else:
        start, end, allday = parse_datetime.guessrangefstr(
            daterange, locale, default_timedelta_date=default_timedelta_date,
            default_timedelta_datetime=default_timedelta_datetime,
        )
    return start, end

if choice == 'no':
            return True
        if choice in ['quit', 'done']:
            return False

        edited = False

        if choice == "Delete":
            if confirm("Delete all occurences of event?"):
                collection.delete(event.href, event.etag, event.calendar)
                return True
        elif choice == "datetime range":
            current = event.format("{start} {end}", relative_to=now)
            value = prompt("datetime range", default=current)
            try:
                start, end, allday = parse_datetime.guessrangefstr(value, locale)
                event.update_start_end(start, end)
                edited = True
            except:  # noqa
                echo("error parsing range")
        elif choice == "repeat":
            recur = event.recurobject
            freq = recur["freq"] if "freq" in recur else ""
            until = recur["until"] if "until" in recur else ""
            if not freq:
                freq = 'None'
            freq = prompt('frequency (or "None")', freq)
            if freq == 'None':
                event.update_rrule(None)
            else:
                until = prompt('until (or "None")', until)
                if until == 'None':

summary = info.get('summary')
        if not summary:
            summary = None
        info['summary'] = prompt('summary', default=summary)
        if info['summary']:
            break
        echo("a summary is required")

    while True:
        range_string = None
        if info.get('dtstart') and info.get('dtend'):
            start_string = info["dtstart"].strftime(conf['locale']['datetimeformat'])
            end_string = info["dtend"].strftime(conf['locale']['datetimeformat'])
            range_string = start_string + ' ' + end_string
        daterange = prompt("datetime range", default=range_string)
        start, end, allday = parse_datetime.guessrangefstr(
            daterange, conf['locale'], adjust_reasonably=True)
        info['dtstart'] = start
        info['dtend'] = end
        info['allday'] = allday
        if info['dtstart'] and info['dtend']:
            break
        echo("invalid datetime range")

    while True:
        tz = info.get('timezone') or conf['locale']['default_timezone']
        timezone = prompt("timezone", default=str(tz))
        try:
            tz = pytz.timezone(timezone)
            info['timezone'] = tz
            break
        except pytz.UnknownTimeZoneError: