Interestingly, sometimes the system is used for future dates. For instance, my drivers license expires in September of H.31, which I guess will never happen now.
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Does this imply that the driver's license becomes invalid and must be replaced with one in the new date system?
Real question
Or -- perhaps more intriguingly -- given that the date in question will never occur, is it valid until the end of time?
Philosophically it's a rather fun question, but practically they'll probably just honor it until the corresponding date of the new era.
It will stay valid. Consider having have to replace millions and millions right after the swap, it will be chaos. The system is simply stupid, not even citizens want it.