I don’t know what to say these days – I’m still working from home so “out of the office” doesn’t sound right any more, but ‘off work’ seems like too much? I’m probably way overthinking it but I’ve felt stuck every time I need to write one lately.
The problem is that some people will just keep the old message, with contact information for their coverage and whatnot. If you do this, it’s important to change the date.

The majority of your out-of-office emails will go to recipients with whom you communicate regularly. If you are sure that there’s a certain level of familiarity with all of the people that get your auto-reply messages, consider writing something about yourself, a funny note, or a joke. That allows them to develop a more personal relationship with you.
I personally like it. Of course, the emails that I’ve seen still say what to do if the matter is urgent and needs to be handled now — but as a person who gets 100+ emails a day, whether I tell you I’m deleting all of them when I get back or not — if it is in the thousands of emails that might accumulate in the time I am off, I’m not going to see it or respond. Better that I tell you now that you are going to have to resend the email after I return (or get my backup to handle it now) than you sit around waiting for a response that is never going to come. It is actually pretty common in my industry for any absence two weeks or more.