Y2K bug
From Memory Alpha, the free Star Trek reference.
The Y2K bug was a computer bug based on a time factor that, at the start of the year 2000, might have caused all manner of problems.
One of Captain Janeway's ancestors experienced the hysteria that arose from this potential issue, although she noted that in the end, the bug caused no problems at all, failing to turn off even a single light bulb. (VOY: "11:59")
