You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND start_time < 1608426600 AND end_time > 1607907600 ORDER BY start_time' at line 4

Hueco horario	lunes 14 dic	martes 15 dic	miércoles 16 dic	jueves 17 dic	viernes 18 dic
M1
M2
M3
M4
11H20 - 12H00
12H00 - 13H00
S1
S2
S3
16H - 19H