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HTML

              
                <div id="wrapper">
<header>
  <h1 id="month"></h1>
  <button id="go-prev">Prev</button>
  <button id="go-next">Next</button>
  
  
</header>
  <ul class="days">
    <li>Sun</li>
    <li>Mon</li>
    <li>Tue</li>
    <li>Wed</li>
    <li>Thu</li>
    <li>Fri</li>
    <li>Sat</li>
  </ul>
  <div id="cal-container">
  </div>
</div>
              
            
!

CSS

              
                html,body{
  height:100%;
  font-family: 'Play', sans-serif;
}
#wrapper{
  width:80%;
  height:100%;
  overflow:hidden;
  position:relative;
  margin:0 auto;
  box-sizing:border-box;
  padding-top:3rem;
}

header{
  height:48px;
  
  button{
    height:2rem;
    padding:0 1rem;
    margin:0.5rem;
    border-radius:4px;
    font-family: 'Play', sans-serif;
    background:#0196EF;
    border:none;
    color:#fff;
    font-size:1rem;
    cursor:pointer;
    
    &:hover{
      background:#0071B5;
    }
    &:active{
      background:#004D7B;
    }
  }
}

#go-prev{
  float:left;
  position:relative;
  z-index:2;
}
#go-next{
  float:right;
  position:relative;
  z-index:2;
}
h1{
  text-align:center;
  font-size:1.5rem;
  line-height:3rem;
  @media (min-width:350px){
    position:absolute;
    width:100%;
  }
}

.days li{
  background:#fff;
  font-size:11px;
  @media (min-width:350px){
    font-size:1rem;
  }
}

#cal-container{
  position:relative;
}

.cal{
  width:100%;
  position:absolute;
  top:48px;
  transition:left 0.5s;
}

.cal:nth-of-type(1){
  left:-100%;
}
.cal:nth-of-type(2){
  left:0;
}
.cal:nth-of-type(3){
  left:100%;
}
.cal:nth-of-type(4){
  left:200%;
}





ul{
  clear:left;
  border-top:1px solid #fff;
  
  li{
  float:left;
  width:calc(100% / 7);
  border-right:1px solid #fff;
  height:3rem;
  background:#F0F1F2;
  box-sizing:border-box;
  text-align:center;
  padding-top:1rem;
    color:#333;
    
    
    &:last-child{
      border-right:none;
    }
  }
  
}

.cal li{
  &:hover{
      background:#D1D7DB;
    }
}
              
            
!

JS

              
                $(document).ready(function() {
  //Variables 変数
  let today = new Date();
  let currentYear = today.getFullYear();
  let currentMonth = today.getMonth();
  const months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];

  //------------------------------------
  // DOM  
  //------------------------------------
  //Containers for each week  週を収めるコンテナ
  const calDom = '<div class="cal">\
  <ul class="c-ul0"></ul>\
  <ul class="c-ul1"></ul>\
  <ul class="c-ul2"></ul>\
  <ul class="c-ul3"></ul>\
  <ul class="c-ul4"></ul>\
  <ul class="c-ul5"></ul>\
</div>';
  //Set the containers to DOM コンテナをDOMにセット
  for (var i = 0; i < 3; i++) {
    $('#cal-container').append(calDom);
  }

  //Set the elements for displaying 表示する要素をDOMへ
  createCalendar(0, currentYear, currentMonth - 1);
  createCalendar(1, currentYear, currentMonth);
  createCalendar(2, currentYear, currentMonth + 1);
  
  //Set the month and the year 月と年
  $('#month').html(months[currentMonth] + '. ' + currentYear);

  //------------------------------------
  //Functions
  //------------------------------------
  
  //Return an object of monthly calendar data 一月のカレンダーデータをオブジェクトで返す
  function getCalObject(YYYY, m) {
    var cal_array = [];

    var targetYear = YYYY;
    var targetMonth = m;
    //Just in case if the month doesn't match with the year 
    //前年度や次年度に行ってしまった場合の処理
    if (targetMonth < 0) {
      targetMonth = 11 - targetMonth;
      targetYear--;
    } else if (targetMonth > 11) {
      targetMonth = targetMonth - 11;
      targetYear++;
    } 
    
    //月の最終日と最初の日
    var lastDateOfCurrentMonth = new Date(targetYear, targetMonth + 1, 0).getDate();
    var firstDayOfCurrentMonth = new Date(targetYear, targetMonth, 1).getDay();

    var dateCounter = 1;
    for (var j = 0; j < 6; j++) { //各月に週をセット

      var eachWeek = [];
      for (var k = 0; k < 7; k++) { //毎週に日をセット

        if (dateCounter  <=  firstDayOfCurrentMonth) {
          eachWeek[k] = '&nbsp;'; //月初日までは空白
        } else if ((dateCounter - firstDayOfCurrentMonth - 1) >= lastDateOfCurrentMonth) {
          eachWeek[k] = '&nbsp;'; //月終わり後も空白
        } else {
          eachWeek[k] = dateCounter - firstDayOfCurrentMonth; //それ以外は日にちを表示
        }
        dateCounter++;
      }
      cal_array.push(eachWeek);
    }

    var calObject = {
      year: targetYear,
      month: targetMonth,
      cal: cal_array
    };
    return calObject;
  }
  
  

  function createCalendar(n, y, m, on) {
    var calObj = getCalObject(y, m);
    for (var i = 0; i < 6; i++) {
      for (var j = 0; j < 7; j++) {
        $('.cal').eq(n).children('.c-ul' + i).append('<li>' + calObj.cal[i][j] + '</li>');
      }
    }
  }

  //------------------------------------
  //Event Handlers
  //------------------------------------

  $('#go-prev').on('click', function() {
    //alert('t');
    //cal を手前に作る
    currentMonth--;
    if (currentMonth < 0) {
      currentMonth = 10 - currentMonth;
      currentYear--;
    }
    $('#cal-container').prepend(calDom);
    //calに値を挿入する
    createCalendar(0, currentYear, currentMonth - 1);
    $('.cal').last().remove();   
    $('#month').html(months[currentMonth] + '. ' + currentYear);
  });

  $('#go-next').on('click', function() {
    //alert('t');
    currentMonth++;
    if (currentMonth > 11) {
      currentMonth = currentMonth - 12;
      currentYear++;
    }
    //cal を最後に作る
    $('#cal-container').append(calDom);
    //calに値を挿入する
    createCalendar(3, currentYear, currentMonth + 1);
    //最初のcalを消す
        
    $('.cal').first().remove();
    $('#month').html(months[currentMonth] + '. ' + currentYear);
  });

});
              
            
!
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