I'm old enough to remember when DST was first introduced during WW2. For the first few years it was year-round. During the winter months the school start-time changed from 9:00 to 9:30 so we elementary school children could walk to school in daylight. (I grew up in Winnipeg.)
That 9:30 start worked well because in that era most moms were stay-at-home moms. But I don't suppose it would work in today's world with many moms having jobs.