I think want you are asking is if it is possible for to have a Date Field which when the user click on the field a calendar comes up to pick a date?
If that is the case then the PDF generated by FormsCentral doesn't support this yet.
I am guessing that you were using LiveCycle Designer to create forms in the past. The some forms generated by LC Designer does support this type of field.
If you want to see this added in FormsCentral PDF you can submit a idea here : http://forums.adobe.com/community/formscentral?view=idea&ideaView=5515 (click on the "Create an Idea" link on the right)