When Does "The Nice Guys" (2016) Take Place?

"The Nice Guys" is a historical fiction crime film written by Shane Black with Anthony Bagarozzi hat released May 20th, 2016. So when is "The Nice Guys" set? 

It takes place in the year: 

1977 AD 

We know this because the main characters Holland March and Jackson Healy attend the Los Angeles Auto Show at about three-quarters through the film. Banners in the background make the year clear. 

Furthermore, the movie has time and place setting title cards over the opening footage that read "LOS ANGELES, CALIFORNIA" and then "1977".