According to your documentation I should be able to retrieve a date from one calendar (using a 'func' function) and store it into another calendar
by using the form:
This sets the target value but doesn't change the date in the displayed target calendar. How do I get the displayed date to change?
Look for the text file in modal mode calendar sample. It explains properties and methods for accessing values of the calendar.
And yes, you can read/set values right via the text input box created/linked-to calendar. The methods are the same as for static HTML inputs.