DatePicker does not correctly use 2-digit year for dateFormat

[sp3]

You can see this on the current jQuery UI web site. Click a date on the popup and you will get a date with a 4-digit year, even though the default dateFormat is as follows -- dateFormat: "mm/dd/yy". It should show a 2-digit year.

There is an additional related bug that if you call the public Datepicker function 'parseDate' with a 2-digit year format and a date with a 2-digit year, it will throw an exception saying that it cannot recognize the year.

This was working fine in 1.10.

[Scott González]

yy is a four digit year. Please see the documentation for more information.