what format should I be setting the value of a datepicker with?

The default format is “%d.%m.%Y”. However, you may redefine it using dateFormat property:

{ view:“datepicker”,dateFormat:"%d/%m/%Y",…}

using the dateFormat

dateFormat: '%m/%d/%Y'

and using

gives mixed results missing something?

We have reproduced the problem. Please try to use attached libraries instead of the originals. (156 KB)