One UI 6.1 on the Galaxy 24 series phones had a few updated features for the clock.Mainly to do with the alarm
Now an update is out for older devices on One UI 6.0 to get the features as well.
You can set the background for your alarm and also set the vibration intensity. Though this will be for select models.
See sunrise and sunset times in the details screen for different places in world clock.
Set ringtones in routines.
Also a change for the displayed minium clock size.
Great to get a bit more customisation for things like this.
Head to the Galaxy Store and update here when it's available for your phone