In the past few years, we have covered plenty of amazing Nixie gadgets here. This robot inspired IN-12 Nixie Tube Clock is also worth a look. It can display the time in 12/24hr format. It can also display the date. You have the option to turn on/off its backlight.
This Nixie Tube clock has a backup battery option for outages. It has buttons on the back panel for adjusting time and date.