The Malachite SDR has an internal clock that is displayed. However, there are no instructions on how to set it. I have
found how to set the clock by accident. Here is how to do it:
Long press HARD button to enter the time setting, then rotate the volume encoder to increase or decrease the number, and press inward to switch which moves to the next entry value. When finished, press and hold the encoder, and release it when the beep sounds.
I hope this is a help to others that have the Malachite SDR. It is a nice receiver, but, the documentation for it is limited.