I can answer this one to some extent, at least for America: the school boards are all run at the local level, which is why our education system is so inconsiste

I can answer this one to some extent, at least for America: the school boards are all run at the local level, which is why our education system is so inconsistent and generally poor, and there's huge resistance to any mandates from the Federal level, and it's like herding cats to get the States to agree on anything. I suppose it should be possible to get State governments to separately legislate that school districts in that state change their hours (since, after all, some states may care more than others, and different states really do have different latitudes which affects their daylight hours), but again it'd have huge resistance since every local school board thinks they know best.