When the BBC did a piece a couple of years on British people’s most annoying Americanisms, “expiration date” instead of “expiry date” made the top 50. As Lynne Murphy observed, those people didn’t really have much cause for their annoyance, but the Google Ngram chart below indeed shows “expiration date” as preferred in the U.S. However, the two versions have been pretty close in Britain for the last fifty years.
Now, what of American “expiry date”? The graph shows it to be on the rise, and the ever-sharp-eyed Nancy Friedman reports a growing number of sightings, notably at the clothing and furnishings chain Anthropologie. I went to the company’s website and went far enough in the process of buying a $500 rug to come upon this:
At that point, I x-ed out of that tab as quick as I could and hightailed it out of there.