0 used for talking about a time in the past, usually when you are remembering nice things about that time:
An artist or producer or engineer from back in the day wouldn't think fondly of surface noise on their records.
At the same time, we must note that, despite the march of technology, the targets associated with our directive from back in the day have by no means been met.
Nevertheless, this was a major accomplishment back in the day.
Back in the day, that's what we wanted to sound like when we were younger.
Back in the day, they'd start out playing son at seven in the evening, and they'd greet the dawn with it.
Back in the day, it wasn't like that.
Everything sounds exactly like it did back in the day.
There aren't enough collaborations like there were back in the day.
