When does school start

If you're in the Northern hemisphere (i.e. Europe, USA, etc) sometime around September. If you're in the Southern hemisphere (like Australia, New Zealand or Africa) I think you should be in school right now...

It depends where you are, what state, whether school is public or private, etc.  Every school starts at a different time.  Your question needs to be a bit more specific

In Denmark school starts around 8 am (GMT-1) and ends between noon and 3 pm, depending on age and how many lessons you have on different days.

The school year starts around August 15 and ends around July 1. There are major holidays in October (1 week), December (10 days - 2 weeks), February (1 week) and March or April (10 days).

 Inga K

It depends on what school and what type like highschool or middleschool or elementry school

It depends on where you live and the school.  Our

September