The Year 2000 problem (also known as the Y2K problem, the millennium bug, the Y2K bug, or simply Y2K) was a notable computer bug resulting from the practice in early computer program design of representing the year with two digits.
This caused some date-related processing to operate incorrectly for dates and times on and after January 1, 2000 and on other critical dates which were billed “event horizons”.
Without corrective action, long-working systems would break down when the “…97, 98, 99…” ascending numbering assumption suddenly became invalid. Companies and organizations world-wide checked, fixed, and upgraded their computer systems.
The following are documents pertaining to this topic.
All documents to the year 2000 crisis from the NSA – This request yielded an $8,000 charge for documents relating to Y2K.
Report of the Defense Science Board Task Force on Year 2000, April 1998 [72 Pages, 1.5MB]