According to the beginning of the movie, the story is set in 1984. At little later, Reese points a gun at a cop's head and says, "What day is it?! The date!" The cop responds, "12th! May! Thursday!" But May 12, 1984 was a Saturday.
The police officer may not have been frazzled by Reece after all. While it's true May 12, 1984 was Saturday, and the movie was released in 1984, it's possible that scene was filmed in 1983. In a normal year, May 12,1983 would have been a Friday, but because 1984 was a leap year, May 12, 1983 was in fact Thursday - possibly the day that scene was shot. Aloha, Rick
Actually it is a slipup, and here's why. The Terminator was originally supposed to be filmed in 1983. However, Arnold Schwarzenegger was under contract to film Conan the Destroyer, so production had to be delayed until 1984. The script was never revised from 1983 when May 12 did indeed fall on a Thursday.
I'm not sure this is actually a slip up. While the movie was filmed/released in 1984, I don't recall if the ever established that it took place in 1984. It very well could have been 1983 in the film. That would actually fit the "time line" with Terminator 2 better. T2 is established at the very beginning as taking place in 1994, and establishes that John is (supposed to be) 10 years old (despite the incredibly poor casting & story for a kid of that age). In order for John to have been born in 1984, he couldn't have been conceived in May 1984 . . . have to be '83.
Actually, it HAD to be 1984, since John Connor was born in February 28, 1985, meaning, he was conceived in May of 1984 (presumably 13/5/1984, since kyle Reese had sex with Sarah Connor the following night of his arrival.
The movie was about a time period in the future where the terminator comes back to the past to prevent the future. Thursday, May 12th in the future after 1984 would have been in:
1988 (http://www.timeanddate.com/calendar/monthly.html?year=1988&month=5),
http://mybirthday.ninja/?m=May&d=12&y=1988&go=Go
May 12, 1797, the War of the First Coalition: Napoleon I of France conquers Venice. So far this year (2019), the St. Louis (former French territory) Blues defeated the Boston Bruins in the NHL Cup Final and the Toronto (French-Canadian territory) Raptors defeated the Golden State Warriors.
1994 (http://www.timeanddate.com/calendar/monthly.html?year=1988&month=5)
http://mybirthday.ninja/?m=May&d=12&y=1994&go=Go
2005 (http://www.timeanddate.com/calendar/monthly.html?year=2005&month=5)
http://mybirthday.ninja/?m=May&d=12&y=2005&go=Go
2011 (http://www.timeanddate.com/calendar/monthly.html?year=2011&month=5)
http://mybirthday.ninja/?m=May&d=12&y=2011&go=Go
2016 (http://www.timeanddate.com/calendar/monthly.html?year=2011&month=5)
http://mybirthday.ninja/?m=May&d=12&y=2016&go=Go
2022 (http://www.timeanddate.com/calendar/monthly.html?year=2022&month=5)
Almost every significant event that happened on these dates is playing out now in the 21st century and now in 2019.
Not a slip-up- The cop has a crazy Mad man screaming at him for the date, and the cop does not want to die- He says the first thing in his mind-it was wrong-who cares? He does not want to die!