It means that when it was 9, it is now 10. This means that if I show up to work at 9, having not changed my clock, I’ll be an hour late.

It means I lose an hour of sleep.

It means that supper is an hour earlier than I am used to.

It means that it is lighter for an hour longer. If it was dark at 6, it is now dark at 7.

It means that I need to get in bed earlier because even though new 10 feels like old 9, new 6 is really old 5.

It is easier to change the clocks in the spring than in the fall.

(I wrote this because I’m always having to remind myself of these things at the time change. This way, I can just look at my blog to remember.)