[jQuery] Problems with minDate on datepicker not allowing before 1999.

If I do something like, minDate: new Date(1930, 1-1, 14)
or, minDate: '-70Y'

The oldest date available will be 1999, and no matter what I've tried
I've never been able to get beyond this barrier. Is this a limitation
of datepicker?

Thank you,
~Joe