[JavaScript] 표준 날짜, 중국 표준 시간, 시간 스탬프, 밀리초 수 상호 전환

//  
let myDate2 = 'Mon Oct 23 2017 17:20:13 GMT+0800 (      )';
let myDate3 = '2017-09-19';
let myDate4 = '2017-09-19 20:00:00';

//    
function dateToMs (date) {
    let result = new Date(date).getTime();
    return result;
}

//  
console.log(dateToMs(myDate2));//--->1508750413000
console.log(dateToMs(myDate3));//--->1505779200000
console.log(dateToMs(myDate4));//--->1505779400000

//  
let myTime1 = dateToLongMs(myDate2);
let myTime2 = dateToLongMs(myDate3);
let myTime3 = dateToLongMs(myDate4);

//     @return   2  ，       ，     。
function msToDate (msec) {
    let datetime = new Date(msec);
    let year = datetime.getFullYear();
    let month = datetime.getMonth();
    let date = datetime.getDate();
    let hour = datetime.getHours();
    let minute = datetime.getMinutes();
    let second = datetime.getSeconds();

    let result1 = year + 
                 '-' + 
                 ((month + 1) >= 10 ? (month + 1) : '0' + (month + 1)) + 
                 '-' + 
                 ((date + 1) < 10 ? '0' + date : date) + 
                 ' ' + 
                 ((hour + 1) < 10 ? '0' + hour : hour) +
                 ':' + 
                 ((minute + 1) < 10 ? '0' + minute : minute) + 
                 ':' + 
                 ((second + 1) < 10 ? '0' + second : second);

    let result2 = year + 
                 '-' + 
                 ((month + 1) >= 10 ? (month + 1) : '0' + (month + 1)) + 
                 '-' + 
                 ((date + 1) < 10 ? '0' + date : date);

    let result = {
        hasTime: result1,
        withoutTime: result2
    };

    return result;
}

//  
console.log(msToDate(myTime1).hasTime);//--->2017-10-23 17:20:13
console.log(msToDate(myTime1).withoutTime);//--->2017-10-23
console.log(msToDate(myTime2).hasTime);//--->2017-09-19 08:00:00
console.log(msToDate(myTime2).withoutTime);//--->2017-09-19

//  
let myDate4 = '2017-09-19';
let myDate5 = '2017-09-19 20:00:00';

//    
function formatterDate (date) {
    let result = new Date(date);
    return result;
}

//  
console.log(formatterDate(myDate4));//--->Tue Sep 19 2017 08:00:00 GMT+0800 (      )
console.log(formatterDate(myDate5));//--->Tue Sep 19 2017 20:00:00 GMT+0800 (      )