Re: Y2K & Date Windowing - THIS IS NOT A BUG
If the current year is meant then a day and month should be sufficient. If provision is made to enter a 2 digit year then the sensible default is to that closest to the current year which is what the user is most likely to expect.
Historical dates are a nightmare. E.g. the archivist classified something as "Early C14th" but looking at it I suspect it could be before another dated in the 1290s and none of the witnesses who are found in other, dated, documents are exclusively C14th.