2000 was infact a serious concern. The Y2K was the Problem, not knowing if missiles would be sent off or if all computers stopped as they were unsure if the Clocks on computers controlling missiles etc would go to the year 19100 (99-100, 19 99 19 100) which may have triggered some nasty missiles off in any dierctions. Thankfully it never only a few things went wrong nothing major though.
Hmm I didnt know that I just thought it was a similar situation to the 2012 thing. My mistake.