How to add the current date and time to the filename when saving the file in Adobe Pro XI?

I would like to get the date and time to append to the filename of a pdf file when it is saved.

Here is the function used for saving the file when a button is clicked:

mySaveAs = app.trustPropagatorFunction(function(doc,path)
{
app.beginPriv();
doc.saveAs(path);
app.endPriv();
})


myTrustedSpecialTaskFunc = app.trustedFunction(function(doc,path)
{
// Privileged and/or non-privileged code above
app.beginPriv();
mySaveAs(doc,path);
app.endPriv();
// Privileged and/or non-privileged code below
});

Here is the code for the button (mouseup):

myTrustedSpecialTaskFunc(this, "/F/signedcontracts/signeddoc.pdf");

I would like to have the filename in the following format:

/F/signedcontracts/signeddocyyyymmddhhmmss.pdf

I have read through and tried several examples, but I'm still unable to get it to work properly.