HOURS = [
('00:00', '00:00'),
('00:30', '00:30'),
('01:00', '01:00'),
('01:30', '01:30'),
('02:00', '02:00'),
('02:30', '02:30'),
('03:00', '03:00'),
('03:30', '03:30'),
('04:00', '04:00'),
('04:30', '04:30'),
('05:00', '05:00'),
('05:30', '05:30'),
('06:00', '06:00'),
('06:30', '06:30'),
('07:00', '07:00'),
('07:30', '07:30'),
('08:00', '08:00'),
('08:30', '08:30'),
('09:00', '09:00'),
('09:30', '09:30'),
('10:00', '10:00'),
('10:30', '10:30'),
('11:00', '11:00'),
('11:30', '11:30'),
('12:00', '12:00'),
('12:30', '12:30'),
('13:00', '13:00'),
('13:30', '13:30'),
('14:00', '14:00'),
('14:30', '14:30'),
('15:00', '15:00'),
('15:30', '15:30'),
('16:00', '16:00'),
('16:30', '16:30'),
('17:00', '17:00'),
('17:30', '17:30'),
('18:00', '18:00'),
('18:30', '18:30'),
('19:00', '19:00'),
('19:30', '19:30'),
('20:00', '20:00'),
('20:30', '20:30'),
('21:00', '21:00'),
('21:30', '21:30'),
('22:00', '22:00'),
('22:30', '22:30'),
('23:00', '23:00'),
('23:30', '23:30'),
]