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Custom eXcells and original values

Hi!
I have some troubles with custom eXcells. I created a new cell type for dates which uses a formatting function I already had in my scripts (kind of like php's 'date'). The Problem now is:
How can I retreive the original, unformatted timestamp for sorting/filtering after it was converted to a string?
I'm using this.setCValue() to set the value AND the original value, but the only way I found to get values was the innerHtml function.

Here's my code:

    function eXcell_datum(cell){
        this.base = eXcell_ro;
        this.base(cell);
        this.getValue = function(){ return this.cell.innerHTML.toString(); }
        this.setValue = function(val){
            if (isNaN(Number(val))) { this.setCValue(""); }
            else {
                this.setCValue( formatDate("%l, %d.%m.%Y",Number(val)), Number(val));
            }
        }
    }
    eXcell_datum.prototype = new eXcell;

You can store original data as part of cell. 
  this.getValue = function(){ return this.cell._data; } 
  this.setValue = function(val){
          this.cell._data=val;
          //existing code...