Ext core, Grails and formating dates

In my previous post I've show how to provide the Grails date JSON deserializer with proper date format from Ext JS. This time we're going to look at the same problem but with a solution that also works for Ext-Core:

Ext.util.JSON.encodeDate = function(o) {
    function pad(n) {
        return n < 10 ? "0" + n : n;
    }
    return  '"' + 
        o.getUTCFullYear() + '-' + 
        pad(o.getUTCMonth() + 1) + '-' + 
        pad(o.getUTCDate()) + 'T' + 
        pad(o.getUTCHours()) + ':' + 
        pad(o.getUTCMinutes()) + ':' + 
        pad(o.getUTCSeconds()) + 'Z"';
}

This function performs much better and uses methods exposed by JavaScript's Date object instead of custom Ext JS date operations. I'd suggest this function instead of the previous one for both Ext-Core and Ext JS.