What about adding a new "dateFormat" for something like "msdate" that could format dates using Microsoft's format?

Code:
 case "date":
                cv = function(v){
                    if(!v){
                        return '';
                    }
                    if(Ext.isDate(v)){
                        return v;
                    }
                    if(dateFormat){
                        if(dateFormat == "timestamp"){
                            return new Date(v*1000);
                        }
                        if(dateFormat == "time"){
                            return new Date(parseInt(v, 10));
                        }
                        if(dateFormat == "msdate"){
                            return new Date(parseFloat(v.slice(6, 19)));
                        }
                        return Date.parseDate(v, dateFormat);
                    }
                    var parsed = Date.parse(v);
                    return parsed ? new Date(parsed) : null;
                };
             break;
Would save me a bunch of code....