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var convertirFechaSQL = function(objetoDate, agregarHora) {
    function dosDigitos(d) {
        if(0 <= d && d < 10) return "0" + d.toString();
        if(-10 < d && d < 0) return "-0" + (-1*d).toString();
        return d.toString();
    }
    var o = objetoDate;
    return o.getUTCFullYear() + "-" + dosDigitos(1 + o.getUTCMonth()) + "-" + dosDigitos(o.getUTCDate()) + (agregarHora ? 
        " " + dosDigitos(o.getUTCHours()) + ":" + dosDigitos(o.getUTCMinutes()) + ":" + dosDigitos(o.getUTCSeconds()) 
        : "");

};