On a PC, entering a 2-digit year does make a difference. Only 4-digit years work properly. (One of the improvements I requested when I first joined was to allow more flexibility in the way dates are entered, like being able to type 010216 without punctuation and have it interpreted as either January 2, 2016 or February 1, 2016 or February 16, 2001, depending on the regional preference. That didn’t happen, though. The Windows version still requires punctuation – and 4-digit years.)