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no they didn’t

On 28 June 2009, British astrophysicist Stephen Hawking hosted a party for time travelers in the University of Cambridge. The physicist arranged for balloons, champagne, and nibbles for his guests, but did not send out the invitations until the following day, after the party was over.

[1] The party was held at Gonville and Caius College on Trinity Street (52° 12’ 21” N, 0° 7’ 4.7” E) at 12:00 UT on 28 June 2009. In preparing for the event, Hawking said he hoped that copies of the invitation might survive for thousands of years, and that “one day someone living in the future will find the information and use a wormhole time machine to come back to my party, proving that time travel will one day be possible”.

[2]Invitations say that the reader is “cordially invited to a reception for Time Travelers” and that no RSVP is required.

[3] Hawking waited in the room for a few hours before leaving, and no visitors arrived.

[4] He regarded the event as “experimental evidence that time travel is not possible”.

on the other hand there was this John Titor guy who is an American soldier from the year 2036, based in Tampa, Florida.

He said that he was assigned to a governmental time-travel project, and that as part of the project he was sent back to 1975 to retrieve an IBM 5100 computer, which was needed to debug various legacy computer programs that existed in 2036 — a possible reference to the UNIX year 2038 problem.

[4] Titor specifically claimed the IBM 5100 had an undocumented ability to emulate IBM System/370 mainframes and translate between their machine code and more modern languages — a capability needed to debug the legacy systems. This feature of the 5100 was not widely known at the time of Titor’s posts, but had been confirmed by engineers who worked on the machine, leading some observers to conclude that whoever was behind the posts had insider knowledge of the 5100’s architecture.

Titor said that he had been selected for this mission because his paternal grandfather was directly involved in the original assembly and programming of the 5100.

He attempted to provide proof of this by describing the unpublicized features of the machine, which led some people to believe that a computer scientist must have been behind the postings.