Add automatic "yyyymmdd" date into prefix field

Script-wise, you could have an export script which adds the date to the front of a document name in a file path.  (For this, the type of document to be exported and export options will be required).  For the date in the aforementioned format:

var d = new Date();
var m = d.getMonth() + 1, a = "", b = "";
if (String(d.getDate()).length == 1) {
    a = "0";
}
if (String(m).length == 1) {
    b = "0";
}
var ISO = d.getFullYear() + b + m + a + d.getDate();
alert( ISO );