Starting and finishing time of school.

[tufguy]

Could you please tell, is it correct to say "starting time of the school is 8 AM and finishing time is 2 PM?"

 

[Tarheel]

Could you please tell, if it is correct to say "The starting time of the school is 8 AM and the finishing time is 2 PM?"

Yes.

 

[tufguy]

Yes.

"Children were coming out of the school after the finishing time or after the school had over."

"He reached school late, after the school had started."

Please check these too.

 

[emsr2d2]

Children were coming out of school after the school day was over.
He reached school late, after school had started.

I don't really like the repetition of "school" in either of those though. I'd be a bit more imaginative:

At the end of the school day, children poured out through the doors/gates.
He arrived after school had started. He was very late!