DNS App that block a website only at specific times

That wouldn’t be good, because the same app would have to block some web addresses all day, and others for specific periods. I need an app or a way to completely blocks a website, including in-app browsers (which are everywhere these days, including most apps like Facebook, Instagram, etc.). I can easily achieve this with apps like “personalDNSfilter,” but I can’t set a time frame for the block; that’s what I’m missing.