In Witcher 3, certain Quests and Actions can only be performed during the Day or Night. What hour does each start at? I thought that 6 am and onwards would be Day, but I notice that at least 5 am and possibly earlier is also considered Daytime.
Daytime is considered the time between 4:00 a.m. and 9:59 p.m. and so night time is between 10:00 p.m. and 3:59 a.m.
More precisely, the time is divided into four categories:
Morning between 4:00 a.m. and 9:59 a.m.
Noon between 10:00 a.m. and 3:59 p.m.
Evening between 4:00 p.m. and 9:59 p.m.
Night between 10:00 p.m. and 3:59 a.m.
Morning, noon and evening all count as daytime, since the ability "Sun and Stars" regenerates Geralt's health during that time.