To use the clock in StandBy Mode as an alarm, head to the Clock app and set an alarm. Swipe to the Clock screen in StandBy ...

You can check if your iPhone model is compatible with the update by referring to this article. With all that said, here's how to change the clock on your Lock Screen to the new Liquid Glass aesthetic.

After you update your iPhone to iOS 26, you will see that the Lock Screen, by default, chooses the “Glass” style as the clock style. You can change it to remove the iOS 26 glass UI.

This detailed guide with screenshots covers how to change Lock Screen controls on iPhone in iOS 18 for a customized setup.