Feature: Century Start

When using a 2 digit year format, and this option is set to a number between 1 and 99, years preceding this number will default to the 2000s, and years following it will default to the '90s.

So, if centuryStart is set to 70,  "70-03-05" would mean y=1970, and "69-03-05" would mean y=1969.