This query:
SELECT to_char(generate_series(0, 23) * interval '1 hour' + '2019-01-01 00:00:00'::timestamp, 'HH24:MI')
will return:
00:00
01:00
02:00
03:00
...
23:00
Just modify the format string for what you desire.
0
solved generate_series for every hour in hh24:mi:ss format