[рони]

tzarek,

function get(data)
{
   data = data.split('/');
   data = new Date(data[2], +data[1]-1, +data[0], 168, 0, 0, 0);
   data = [data.getDate(),data.getMonth()+1,data.getFullYear()];
   data = data.join('/').replace(/(^|\/)(\d)(?=\/)/g,"$10$2");
   return data
}
alert(get("29/08/2013"));