How to display date and time on Finder desktop in macOS Sequoia?

One option would be to add the Clock and the Calendar widget to the desktop. See: Add and customize widgets on Mac - Apple Support

or if you are asking about the date and time in the menu bar, see: Change the menu bar clock format on Mac - Apple Support

MaceyD wrote:

How to see date and time on finder desktop. sequoia

[Re-Titled by Moderator]

System Settings > Lock Screen and enable "Show large clock" to display it on both the screen saver and lock screen, or just the lock screen

widgets—

Add and customize widgets on Mac