Friday is 14 February, Valentine's Day, when we celebrate romance with our special someone (or cry alone at home while sculling a bottle of cheap plonk). Don't ruin the celebrations by forgetting to include an apostrophe in Valentine's Day.
Wine picture from Shutterstock
The day is named for Saint Valentine, and while the general love-in doesn't have much to do with a third-century Roman martyr whose origins are obscure, the grammatical rule is clear. It's Valentine's Day, and thus requires a possessive apostrophe. (If you're not clear on how to use apostrophes, check out our detailed guide.)
Love hurts. Accuracy matters.
Lifehacker's Mind Your Language column offers bossy advice on improving your writing.