UnixTime変換メソッド(JavaScript)

convertUnixTime.js

function convertUnixTime(date){
    var result = '';

    var d = new Date(date * 1000 );
    var year  = d.getFullYear();
    var month = d.getMonth() + 1;
    var day   = ( d.getDate()      < 10 ) ? '0' + d.getDate()    : d.getDate(); 
    var hour  = ( d.getHours()     < 10 ) ? '0' + d.getHours()   : d.getHours();
    var min   = ( d.getMinutes()   < 10 ) ? '0' + d.getMinutes() : d.getMinutes();
    var sec   = ( d.getSeconds()   < 10 ) ? '0' + d.getSeconds() : d.getSeconds();

    year = year.toString();
    month = (month < 10) ? '0' + month : month;
    day = day.toString();
    hour = hour.toString();
    min = min.toString();
    sec = sec.toString();

    result = year+ '/' + month+ '/' + day+ ' ' + hour+ ':' + min + ':'+ sec;

    return result;
}

a = convertUnixTime(100000000)

console.log(a);

//実行結果
"1973/03/03 18:46:40"