deki-rtc exposes a real-time clock as a scene component. The engine defines the abstract IDekiRTC provider interface in its core; this package ships the concrete DS3231RTCComponent that talks to a DS3231 over I²C, alongside a SystemClockRTCComponent that reads the host clock so a scene keeps working in the editor.
Every component it adds, every exported property and its changelog are in the deki-rtc reference.