I have installed the 2018-W06 weekly build (for amd64) of Kali, and when I start it up it gives error messages saying that "Network Time Synchronization" has failed to start.

I have made a bug report about this. But actually I'm not quite sure that I understand exactly what "Network Time Synchronization" is or (more importantly) why I should need it. What adverse effects (if any), for the purposes of Kali use, might result from my not having it?

Apologies for my ignorance. I have tried to research this matter online, but can find nothing specifically Kali-related which explains whether Network Time Synchronization is important --- and if so, why.