2am, almost every US clock moves back an hour. Photo: MarcEGottlieb, CC BY-SA.
Arizona and Hawaii don't change. Everywhere else does.
Aviation runs on UTC. But a US-Europe connection that week can get confusing.
Overnight. Chicago goes from 5:45pm to 4:44pm between Saturday and Sunday.
Now stuck in the Senate with no vote scheduled. See the full guide.
Sunset times, flight myths, and where the permanent-DST bill really stands.