After you change the time, force a manual regeneration. There’s usually a button for that. Hold it down for 3 seconds. The machine will scream at you for a minute, then flush. Watch it for a minute. Make sure the drain hose isn’t spraying saltwater all over your basement floor. That’s a bad sign.
If it’s all good, you’re done. You have officially mastered the art of softener scheduling. Go reward yourself with a glass of non-cloudy, silky-smooth water. You’ve earned it.
And remember: if all else fails, just call the guy who installed it. He’ll scoff at you, adjust it in 15 seconds, and charge you $75. That’s the price of convenience. Or you could just set it to 2 AM and never think about it again. Your call, friend.