I have not heard of such a control or parameter for the date picker. We could make one that would relate the dates in the Hebrew calendar to the gregorian, but it would take a little planning, and perhaps a seperate table to keep related dates, if you get where I am going.
That would be cool to work on if you would like to create it. Do you have any references that relate Hebrew to gregorian for several years, at least?
mmcdonal
Look it up at:
http://wrox.books24x7.com