several years ago here and I can't find it.

Basically, you input your location and a date, and it showed you a graph with sun angles and you could see when it was OK to be out and not worry about sunscreen. It wasn't a UV index graph or chart per se, but it was like that. I have found some sites/apps that do that, but this was more just about sun angle and you could figure out your own risk.

Anyone recall such a conversation here or know the site I'm talking about?

This is the EPA's UV index site, but the one I'm thinking of you could just enter different locations and dates and it would tell you. IE, what's it going to be like on Lake Powell in September is different from June.