format : "DD/MM/YYYY" should resolve your issue. If you need more help regarding available formats, please visit http://momentjs.com/ which is used by this control internally.
I was facing an issue where this "format" thing was working fine on local machine but when I deployed the application on server, the date was not getting populated and the control was empty. when I commented the format code, it started working but then I didn't have the format that I needed. I fixed that issue using globalization entries in web.config.
<system.web>
<globalization
requestEncoding="utf-8"
responseEncoding="utf-8"
culture="en-GB"
uiCulture="en-GB" />
</system.web>
This helped in ensuring that both local & server environments have same culture.