On UK Corolla's we had a blanking plate where a clock is normally placed in other markets.

The clock is normally integrated into the audio head unit, however when you remove that and fit your own aftermarket head unit, you lose the clock.

So here's a clock module which clicks into the same slot where the massively over-engineered blanking plug is fitted.

Clock module is from Aliexpress https://www.aliexpress.com/item/1005004921672306.html (or search for RX8025) and it's wired into the cigarette lighter wiring, so the display only comes on with the ACC key position, but it has an integrated lithium battery to keep time when the power is off.