Officers in Casper, Wyoming, said the Bryant Johnson, from central Wyoming, in the US, was arrested for public intoxication.
Casper police said the man they encountered at 10.30pm on Monday claimed he was from the year 2048.
The suspect told police he wanted to warn the people of Casper that aliens will arrive next year, and that they should leave as soon as possible.
He asked to speak to the “president” of the town, about 170 miles (270 kilometres) northwest of Cheyenne.
According to police, the man told them he was only able to time travel because aliens filled his body with alcohol.
He said that the plan had gone wrong and he was supposed to be transported back to 2018, not 2017.
Police said he smelt of alcohol, and spoke with slightly slurred speech, but he said to them: “The aliens were coming next year and we needed to make sure to leave as fast as possible.”
Officers did not believe the man’s claims and arrested him as a drunk.
According to a police arrest report, he didn’t specify an exact date or time for the aliens’ arrival.
He refused to speak with nurses or doctors and instead insisted on meeting with “the president”.
He also claimed he stood on a “giant pad” which then transported back in time.
Johnson was taken to the Natrona County Detention Center without further incident.