Javascript 현재시간 구하기 ( getTime, UTC, Local)

/**
 * NOW 1483670765299 (milliseconds)
 * @returns {number}
 */
function getNow(){
    return new Date().getTime();
}

/**
 * UTC 2017-01-06T02:46:05.299Z
 * @returns {string}
 */
function getUTCString(){
    return new Date().toISOString();
}

/**
 * LOCAL 1/6/2017, 11:46:05 AM
 * @returns {string}
 */
function getLocalTimeString(){
    var now = new Date();
    return now.toLocaleString();
}