Lost my clock, blue tooth etc from the right side of menu bar.
They are set in control center to be there but nothing any ideas please.
iMac 21.5″ 4K, macOS 13.6
If you haven't already: updating your MacOS version to the latest Ventura OS 13.7.2
may be a good first step in trouble-shooting. Eg: What's new in the updates for macOS Ventura? - Apple Support says: "This update provides important security fixes and is recommended for all users."
(NB: Wise to back up Mac data beforehand, if you choose to update.)
Else: if icons were accidentally removed from the menu bar, you might double-check in System Settings > Control Centre to see what "Clock options" menu-bar settings are in place. (Also check there space to show clock / date in menu bar.)
ie: Check which clock options are selected
You could also check which bluetooth settings are in place and what is discoverable,