A work in progress. If you expect greatness, you're doing it wrong.
Vulcan landing on Earth before official First Contact.
In First Contact, this date is 2013, however that would force Cochrane to be 106 when he disappears aboard his ship. One could argue an advancement in medicine and thus a longer lifespan, the birth date is disputable. Another thought is that he only seems older due to radiation poisoning. The man's curiosity is going to get him killed someday.
Zefram Cochrane's work.
Exact date unmentioned, logic dictates that it occurred in this time frame.