It’s worth looking at @mhucka’s shortcut too. Depending on how you’re using notes you might find this one more to your liking. It’s got more “moving parts” but basically when you run the shortcut it asks what type of note you’re creating and then it’s tailored to your intended use (it’s all customisable in the shortcut). E.g. if you’re creating a diary entry, you would select “diary” and it automatically adds the date.