code: def convert_timezone(date_str, tz_from, tz_to="UTC", fmt=None):
      
      tz_offset = datetime_to_timezone(
          datetime.datetime.now(), tz=tz_from).strftime('%z')
      tz_offset = tz_offset[:3] + ':' + tz_offset[3:]
  
      date = parse_date(str(date_str) + tz_offset)
      if tz_from != tz_to:
          date = datetime_to_timezone(date, tz_to)
  
      if isinstance(fmt, str):
          return date.strftime(fmt)
      return date
docs: get timezone as tz_offset