Happy Presidents Day! Or is it President’s Day? Or Presidents’ Day? What you call the national holiday depends on where you are, who you’re honoring, and what you are celebrating.

Saying "President’s Day" implies that the day belongs to a singular president, such as George Washington or Abraham Lincoln, whose birthdays are the basis for the holiday. On the other hand, referring to it as "Presidents’ Day" means that the day belongs to all of the presidents—that it’s their day collectively. Finally, calling the day "Presidents Day"—plural with no apostrophe—would indicate that we’re honoring all POTUSes past and present (yes, even Andrew Jackson), but that no one President actually owns the day.