'Represent a Shift by Start and End times'

@staticmethod
def fire_shift_represent(id, row=None):

    if row:
        pass
    elif (not id):
        return current.messages['NONE']
    else:
        db = current.db
        table = db.fire_shift
        row = db((table.id == id)).select(table.start_time, table.end_time, limitby=(0, 1)).first()
    try:
        return ('%s    -    %s' % (row.start_time, row.end_time))
    except:
        current.messages.UNKNOWN_OPT
