This is not a hard-and-fast rule. There's hardly agreement in style guides on this note. Don't be a jerk and nitpick style on the internet; it does not add to t

This is not a hard-and-fast rule. There's hardly agreement in style guides on this note. Don't be a jerk and nitpick style on the internet; it does not add to the conversation. https://english.stackexchange.com/questions/13631/is-an-apostrophe-with-a-decade-e-g-1920-s-generally-considered-incorrect https://english.stackexchange.com/questions/13631/is-an-apos...