I would seriously consider mandating that devices MUST NOT (in the RFC vernacular) have real-time human-calendar clocks on board them. I am in total agreement.

I would seriously consider mandating that devices MUST NOT (in the RFC vernacular) have real-time human-calendar clocks on board them. I am in total agreement. My experience with gps-based clocks in high-precision hard real-time environments taught me that time is really effing hard to do perfectly, it is full of countless non-obvious corner cases. Some of which will only bite you two years into deployment.