The school starting and finishing time.

[tufguy]

"Their school started at 8:30 AM and finished at 12:30 PM because their half yearly exams are going on these days. The school's starting time has been put backwards one hour (on normal days the school starts at 7:30 AM) and finishing time has been brought forward one hour and a half (normally the school finishes at 2 PM)."

Please check.

 

[teechar]

"Their school started at 8:30 AM and finished at 12:30 PM because their having their half yearly exams. [STRIKE]are going on these days.[/STRIKE] The school's starting time has been put back [STRIKE]wards[/STRIKE] one hour (on normal days the school starts at 7:30 AM) and the finishing time has been brought forward one hour and a half (normally the school finishes at 2 PM)."

.

 

[emsr2d2]

... because they're ​having their half-yearly exams".

 

[teechar]

Absolutely.
I'll put it down to a bad hair day, which it certainly has been.