In Auckland AFF / NFF Boys school football is still played on Saturday mornings with 13th grade (Year 9) 9.00am games thru to 1st XI (Senior A & A1) midday kick-off. The top tier of club youth club football (Metro & Conference competitions) where this is a potential clash with 1st XI's and 2nd XI's is then played on Sunday's i.e. 15th Grade, 17th and the top U19 league. (last year 2013) they tried an 16th grade which by all accounts was pretty average)
This seems to have been reasonably successful with kids able to play for both school and maintain their club affiliations. Training commitments can be a bit of a balance but many of the elite school programmes train early morning and during school hours in a dedicated slot.
The latest challenges up here in Auckland is an insistence of the AFF player development leadership that kids play in the correct age group despite ability to play up physical ability etc. Under the Sean Douglas era it was not uncommon for a number clubs to field teams in the 14th Metro comp (Sat) and 15th Metro comp (Sun) invariably a number of 14th grade kids would play 14's on the Sat then turn out for the 15's on Sun. This was all good until last year when some obscure rule around only playing 2 player up per grade were identified and enforced.
I see under another thread Liam Jordan's achievements are being commented on. To the best of my knowledge Liam played 2 grades up pretty much all through his youth football, played 1st XI as a year 9 etc. Under the current ideals of the AFF leadership this basically won't happen irrespective ability etc.