approximately six o'clock (old Japanese time system)
Archaic term from the traditional temporal hour system, where the day was divided into six daytime and six nighttime hours. The exact modern equivalent varies by season, but it roughly corresponds to dawn or dusk (around 6 a.m. or 6 p.m.).
See also: 六つ
In the Edo period, 六つ時 was called dawn-six or dusk-six.