When Mulder and Scully arrive at the hospital the crawl at the bottom of the screen reads "Hartwell Psychiatric Hospital", but on their second trip to the hospital you get a close look at their visitor badges that read "Hartford Psychiatric Hospital". See more
Mulder, these people, even when they were alive, mangled biblical prophecy to the extent that it's unrecognisable. The year 2000 is just their artificial deadline, and besides 2001 is actually the start of the new millennium.
Nobody likes a math geek, Scully.