Date field value into text box

There are several ways this could be done.  Here's a simple and straight forward method.

Use this script in the Custom Validation script for the date field:

// validate date entry first
if(/\d{1,2}\/\d{1,2}\/\d{4}/.test(event.value))
{
    var dtValue = util.scand("mm/dd/yyyy",event.value);
    this.getField("text1").value = util.printd("mmm",dtValue);
    this.getField("text2").value = util.printd("dd",dtValue);
    this.getField("text3").value = util.printd("yy",dtValue);
}