Many systems have code in place to set the range when a partial (i.e. 2-digit) year is entered. Call it a two digit year cutoff or century pivot, it works, as

Many systems have code in place to set the range when a partial (i.e. 2-digit) year is entered. Call it a two digit year cutoff or century pivot, it works, as long as it gets updated by someone every couple decades or so. Only having two-digits for the year can be problematic for some organizations who need to keep DECADES of data/records, but I can't imagine almost any will need to keep millenia worth of records preserved... So I'd say a century or millennia cutoff/pivot will suffice. How long do we need to keep track of a bunch of dinosaurs' credit card transactions, anyhow? With apologies to geologists, archaeologists and astronomers. 5-digit years won't be enough for them, anyhow.