What time era is presented in Gotham?

I actually posed a similar question (and answered it myself) on https://scifi.stackexchange.com/ because I was anticipating it.

Gotham showrunner Bruno Heller explained this to Entertainment Weekly some time ago:

Gotham is not set in any particular time period: Okay, this has been out there a bit, but Heller had a nice quote elaborating on the show’s timeless quality: “It’s a mash-up, to use the modern phrase,” he said. “If today Batman exists, then this world is the past. But it’s everybody’s past, an 18-year-old’s past and a 54-year-old’s past. So in your memory, the past is all mashed up together. So in this Gotham, it’s a kind of timeless world. It’s yesterday, it’s today, and it’s tomorrow all at the same time, because that’s the world that dreams live in.”

I think Gotham, the tv show, is supposed to take place in the same time period as ours, but in a different dimension than our own. It is supposed to be familiar but with small differences, like they have cell phones, but they use 70s technology like overhead projectors and microfilm readers. And of course the 70s-style cars.