It's that day when people either forget the clocks go back, remind everyone else about the clocks going back, make jokes about the clocks going back, or curse the fact that they have young children who aren't bothered either way.
At least that's what Twitter looked like as much of the nation rejoiced in an extra hour in bed.
Labour and Tory politicians thought of the same joke:
Is it a joyous day, heralding the fact that Christmas is just around the corner? Or the arrival of long, dark winter?
Either way, the weather is getting in on the act, promising us the worst storm for five years on Sunday night. That heatwave seems like a long time ago now...