I've had the same frustration as the OP where the date wasn't included when I was looking for time-sensitive information. It was a disservice to me-as-reader,

I've had the same frustration as the OP where the date wasn't included when I was looking for time-sensitive information. It was a disservice to me-as-reader, and I ended up not reading the article and looking elsewhere, since I couldn't be sure of its timeliness. If that article was timeless, it's because I hear about it again and again from other readers linking to it, not because there was no date on it. Of course, I don't know what you write, nor have I seen the results of your a/b testing. So shrug.