England Year 4 DOB

[Todayissunny]

Just a quick question. Can someone tell me the earliest and latest dates of birth for children in year 4 primary in England.
Thanks.

Current year 4 would be born between 1/9/2010 and 31/8/2011

From sept onwards it would be 2011/12 dates

Currently or for the September coming? Currently is September 2010-August 2011.

Year 4 pupils are 8 (and any number of days) on the 31 August before the start Y4 in the September
Current Yr4 we born between September 2010, and Aug 2011.

Thank you.