Morning or after school(2-3pm), it's the least crowded and sometimes I can even film my workouts to compare form later.
And my squat rack isn't occupied.

After school, usually afternoons, to relieve stress , or the german phrase "relieve steam" , what i call it.

Also at saturday evenings, also to relieve stress and relax. A big advantage is that there are not many people, so I can use everything without waiting.

I love to cook at about 6 pm, go to gym, (takes hour there an another back) come home at 10, and eat dinner

Hmmmm, probably mid-day or the evening. As much as I would like to be, I've never been a morning person, so fitting in a workout in the morning is tough for me.

I like the nights anyway, less crowded and you can keep to your pace.