Thanks a lot!!!
I don't knwo what it's going on but I cut and paste the code in my html page and does not work!!

console.log('Before opts');
var opts = $('#desde').datebox('options');
console.log('Afer opts');
console.log("Before setValue");
$('#desde').datebox('setValue', opts.formatter(new Date()));
console.log("After setValue");
In the console I got
Before opts
jquery.easyui.min.js:6696 Uncaught TypeError: Cannot read property 'options' of undefined
So it got problems with this line
var opts = $('#desde').datebox('options');
desde is defined as :
Desde: <input id="desde"
class="easyui-datebox"
style="width:120px"
required ="required"
data-options="formatter:Rutinas.dateFormatter,
parser:Rutinas.dateParser">
Another suggestion ?