def METHOD_NAME(date_string: str) -> datetime:
    """Return a date time object using provided date_string in legislation timezone.
    Note:
    This function expect a date_sting without time (example: 1990-12-31).
    It is assumed that the date_string provided is already in legislation timezone.
    """
    _date = date.fromisoformat(date_string)
    return LegislationDatetime.as_legislation_timezone_from_date(_date)