public/javascripts/yui/datatable/datatable.js
function(el, oRecord, oColumn, oData) {
        var oConfig = oColumn.dateOptions || this.get("dateOptions");
        el.innerHTML = util.Date.format(oData, oConfig, oConfig.locale);
    }
function(el, oRecord, oColumn, oData) {
        var oConfig = oColumn.dateOptions || this.get("dateOptions");
        el.innerHTML = util.Date.format(oData, oConfig, oConfig.locale);
    }
function ( el , oRecord , oColumn , oData ) { var oConfig = oColumn . dateOptions || this . get ( "dateOptions" ) ; el . innerHTML = util . Date . format ( oData , oConfig , oConfig . locale ) ; }
Formats JavaScript Dates.

@method DataTable.formatDate
@param el {HTMLElement} The element to format with markup.
@param oRecord {YAHOO.widget.Record} Record instance.
@param oColumn {YAHOO.widget.Column} Column instance.
@param oData {Object} Data value for the cell, or null.
@static
Formats JavaScript Dates .