pre-fill values don't work

Hi, this is my code:

**Html:**
`Click`
``

**I change the attribute programmatically:**

$("#ChangeButton").click(function ()
{
$("#DateOfBirth").data("data-value","1966-12-14");
})

**My pickadate Setting**
$("#DateOfBirth").pickadate(
{
format: "ddd dd, mmm yyyy",
formatSubmit: "yyyy-mm-dd"
});

**What is Wrong ?**