Way back when I started studying Spanish, I always learned that “in the morning/afternoon” was “por la manana/tarde”. More and more lately (well, actually sometime shortly thereafter) I hear and read only “en la manana/tarde”.

Does anybody still use “por” or is it always “en” nowadays?

I still see it listed in dictionary entries online and I am assuming these are current, in terms of their usage — although maybe that is a bad assumption. It seems I’ve been making a lot of those lately.

Any comments and opinions would be greatly appreciated. Thanks.