> The Long Now Foundation uses five-digit dates like 02017 in their work. :)

Hopefully they don't have any octal-related bugs.

To really future proof themselves they should have gone with 2.017*10^3

Nobody will care about significant year digits in a few billion years

People get bans on XBox Live until 9999-12-31 I guess it's probably just an Input validation thing. Also I think it's fair to given most people their account back after that amount of time.