Spot quiz: Is the American holiday in February:

a) President’s Day
b) Presidents’ Day
c) Presidents Day?

Surprise! So far, the answer is (d), all of the above.

I’m editing a client’s calendar, which includes reference to both Canadian and American holidays. I double-checked this item because I’ve seen all three versions. It’s not in my Canadian Press Stylebook or my Canadian dictionaries. A search turns up every variation, but since it honours both Washington and Lincoln, it makes sense that it would be plural, “Presidents’.” So I turned to the place you’d think would be the definitive source of the correct usage, the official U.S. federal government web site.

It showed all three in various sections of the site.

I emailed a request for clarification and the “USA.gov Citizen Response Team” (whose goal is “to make it easy for you to communicate with the government”) promised me a response within two days. You’ll laugh (or maybe cry): Here’s the not-quite-definitive answer:

“We have received your inquiry concerning which is the correct phrasing to refer to Presidents’ Day. The phrasing “Presidents’ Day” and “President’s Day” are both used and are both correct (depending on how it is used). We hope you find this information helpful.”

Umm, not really! There were no helpful suggestions as to which use would be appropriate in which instance. Frankly, I think they should pick one, run with it, be consistent. Don’t you think?