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HTML 

              
                <div class="wrapper">
  <canvas id="chart" width="300" height="300">
    Canvas not supported ...
  </canvas>
</div>
<div class="chartSelect">
  <input type="radio" id="cs_week" name="cs_radio" value="week" onchange="drawChart(this.value)" checked>
  <label for="cs_week">Week</label>
  <input type="radio" id="cs_month" name="cs_radio" value="month" onchange="drawChart(this.value)">
  <label for="cs_month">Month</label>
</div>
!

CSS 

              
                * {
	-webkit-tap-highlight-color: rgba(0,0,0,0);
	-webkit-touch-callout: none;
	user-select: none;
}
body {
  margin: 0;
  padding: 0;
}
.wrapper {
  margin: 10px;
  padding: 20px;
  width: 300px;
  height: 300px;  
  border: solid 1px #ccc;
}
.chartSelect {
  margin: 10px;
  padding: 10px;
  width: 320px;
  border: solid 1px #ccc;
  line-height: 1;
}
input[type="radio"], label {
  cursor: pointer;  
}
#cs_month {
  margin-left: 10px;
}
!

JS 

              
                const RECORD = [
  {y: 2018, M: 6, d: 8},   // mon 7/2 ... 1
  {y: 2018, M: 6, d: 9},   // mon 7/9 ... 3
  {y: 2018, M: 6, d: 10},
  {y: 2018, M: 6, d: 11},
// 7/16 ... 0
// 7/23 ... 0
// 7/30 ... 0

  {y: 2018, M: 7, d: 8},   // mon 8/6 ... 2
  {y: 2018, M: 7, d: 12},

  {y: 2018, M: 7, d: 19},  // mon 8/13 ... 1
  
  {y: 2018, M: 7, d: 20},  // mon 8/20 ... 7
  {y: 2018, M: 7, d: 21},
  {y: 2018, M: 7, d: 22},
  {y: 2018, M: 7, d: 23},
  {y: 2018, M: 7, d: 24},
  {y: 2018, M: 7, d: 25},
  {y: 2018, M: 7, d: 26},
                          // mon 8/27 ... 0
  {y: 2018, M: 8, d: 3},  // mon 9/3 ... 6
  {y: 2018, M: 8, d: 4},
  {y: 2018, M: 8, d: 5},
  {y: 2018, M: 8, d: 6},
  {y: 2018, M: 8, d: 7},
  {y: 2018, M: 8, d: 8},
  {y: 2018, M: 8, d: 10}, // mon 9/10 ... 4
  {y: 2018, M: 8, d: 11},
  {y: 2018, M: 8, d: 13},
  {y: 2018, M: 8, d: 14},
];

/*
const RECORD = [
//  {y: 2018, M: 7, d: 5},
//  {y: 2018, M: 7, d: 6},
//  {y: 2018, M: 8, d: 5},
//  {y: 2018, M: 8, d: 14},
];
*/

//const now = moment();
//RECORD.push({y: now.year(), M: now.month(), d: now.date()});

// ４月５０％
const __RECORD =[];
const __start = moment([2018,3,1]);
const __days = __start.daysInMonth() / 2;
for (let i=1; i<=__days; i++) {
  __RECORD.push({y: 2018, M: 3, d: i});
}
RECORD.unshift(...__RECORD);


// ２月１００％
const _RECORD =[];
const _start = moment([2018,1,1]);
const _days = _start.daysInMonth();
for (let i=1; i<=_days; i++) {
  _RECORD.push({y: 2018, M: 1, d: i});
}
RECORD.unshift(..._RECORD);



const ARIS = {
//  data: [],
//  label: [],
//  options: [],
  chart: null,
};


function drawChart(type) {
  const CHARTDATA = createChartData(type);
  const OPTIONS = createChartOptions(type, CHARTDATA.xRng);

  if (ARIS.chart) {
    ARIS.chart.data.labels = CHARTDATA.label;
    ARIS.chart.data.datasets[0].data = CHARTDATA.data;
    ARIS.chart.data.datasets[0].backgroundColor = getColor(type, 0.8);
    ARIS.chart.options = OPTIONS;
    Chart.defaults.global.defaultFontColor = getColor(type, 1);
    ARIS.chart.update();
  } else {
    const CTX = document.getElementById('chart').getContext('2d');
    ARIS.chart = new Chart(CTX, {
      type: "bar",
      data: {
        labels: CHARTDATA.label,
        datasets: [{
          data: CHARTDATA.data,
          backgroundColor: getColor(type, 0.8),
          borderWidth: 0,
        }]    
      },
      options: OPTIONS
    });
    Chart.defaults.global.defaultFontColor = getColor(type, 1);
  }
}

function getColor(type, a) {
  let color;
  switch (type) {
    case "week": color = `rgba(255, 165, 0, ${a})`; break;
//    case "month": color = `rgba(255, 69, 0, ${a})`; break;
    case "month": color = `rgba(255, 20, 147, ${a})`; break;
    default: color = `rgba(0, 0, 0, ${a})`; break;
  }
  return color;
}

function createChartOptions(type, xRng) {
  let yaxes_min, yaxes_max, yaxes_stepsize, yaxes_callback;
  let xaxes_unit, xaxes_formats_week, xaxes_formats_month, xaxes_isoweekday;
  let title_text;

  switch (type) {
    case "week":
      yaxes_min = 0;
      yaxes_max = 7;
      yaxes_stepsize = 1;
      yaxes_callback = (value) => value;

      xaxes_unit = "week";
      xaxes_formats_week = "M/D";
      xaxes_formats_month = "";
      xaxes_isoweekday = true;
 
      title_text = "Weekly aggregate";
      break;
    case "month":
      yaxes_min = 0;
      yaxes_max = 100;
      yaxes_stepsize = 25;
      yaxes_callback = (value) => `${value}%`;

      xaxes_unit = "month";
      xaxes_formats_week = "";
      xaxes_formats_month = "M";
      xaxes_isoweekday = false,

      title_text = "Monthly aggregate";
      break;
    default:
      break;
  }

  const OPT = {
    scales: {
      yAxes: [{
        ticks: {
          min: yaxes_min,
          max: yaxes_max,
          stepSize: yaxes_stepsize,
          callback: yaxes_callback
        },
        gridLines: {
          color: getColor(type, 0.4),
          zeroLineColor: getColor(type, 0.8)
        }
      }],
      xAxes: [{
        type: 'time',
        time: {
          unit: xaxes_unit,
          displayFormats: {
            week: xaxes_formats_week,
            month: xaxes_formats_month
          },
          isoWeekday: xaxes_isoweekday,
          min: xRng.cmin,
          max: xRng.max
        },
        ticks: {
          source: 'labels',
          maxRotation: 0
        },
        gridLines: {
          display: false,
        }
      }]
    },    
    title: {
      display: true,
      text: title_text,
      fontSize: 14,
      position: 'top',
      padding: 12
    },
    legend: {
      display: false
    },
    tooltips: {
      enabled: false
    },
    pan: {
      enabled: true,
      mode: "x",
      speed: 10,
      threshold: 10,
      rangeMin: {
        x: xRng.rmin
      },
      rangeMax: {
        x: xRng.max
      },
    },
    zoom: {
      enabled: true,  // panのときもtrueにしないといけない
      mode: ""
    },
    hover: {
      mode: ""    // disable
    }
  };
  return OPT;
}

function createChartData(type) {
  const LEN = RECORD.length;
//  console.log(`len: ${LEN}`);
  const SHOWRANGE = 6;    // canvasに表示するデータ数

  let rmin, cmin, max;
  let num, unit, ofs;
  let pushData;

  /***
   * x axes: unix timestamp
   * rmin ----- cmin ===== max
   *              | canvas  |
   *  |        record       |
   **/
  switch (type) {
    case "week":
      rmin = moment(RECORD[0]).startOf("isoWeek"),   // 最も古い（先頭の）記録
      cmin = moment().startOf("isoWeek").add(-SHOWRANGE, "w"), // 表示する範囲
      max = moment().startOf("isoWeek")  // 現在の日付

      num = max.diff(rmin, "weeks");
      unit = "w";
      ofs = 3.5*24*60*60*1000;   // 時間軸のオフセット（表示用：一週間の半分）
      pushData = (count) => {DATA.push(count)};
      break;
    case "month":
      rmin = moment(RECORD[0]).startOf("month"),
      cmin = moment().startOf("month").add(-SHOWRANGE, "M"),
      max = moment().startOf("month")

      num = max.diff(rmin, "months");
      unit = "M";
      ofs = (max.daysInMonth()/2)*24*60*60*1000;   // 時間軸のオフセット（表示用：月の半分）
      pushData = (count) => {
        const days = moment(LABEL[LABEL.length-1]).daysInMonth();
        DATA.push((count/days)*100);
      };
      break;
    default:
      break;
  }

  console.log(`rmin: ${rmin.format('L')}`);
  console.log(`cmin: ${cmin.format('L')}`);
  console.log(`max:  ${max.format('L')}`);

  console.log(`num: ${num}`);

  // setting of start data
  let start;
  if (num < SHOWRANGE) {   // データ数がSHOWRANGEに満たない場合
    num = SHOWRANGE;       // 回数0のデータを追加してSHOWRANGE分のデータを作成する
    rmin = cmin;      // rangeMinがcanvas内にあってもpanできてしまう
    start = cmin.clone();  // 先頭データを現在からSHOWRANGE分前にする
  } else {
    start = rmin.clone();  // 先頭データを最初の記録にする
  }

  /***
   * note:
   * moment(undefined) === moment()
   **/  

  // Aggregate
  const LABEL = [], DATA = [];
  let count = 0;
  let recIdx = 0;
  for (let i=0; i<num; i++) {
    LABEL.push(start.valueOf());
    const endValue = start.add(1, unit).valueOf();   // Increment start object

    for (; recIdx<LEN; recIdx++) {
      if (moment(RECORD[recIdx]).valueOf() < endValue) {
        count++;
      } else {
        pushData(count);
        count = 0;
        break;
      }
    }
    if (recIdx === LEN) {
      pushData(count);
      count = 0;
    }
  }

  return {
    label: LABEL,
    data: DATA,
    xRng: {
      rmin: rmin.valueOf() - ofs,
      cmin: cmin.valueOf() - ofs,
      max: max.valueOf() - ofs
    }
  };
}

window.onload = () => {
  drawChart("week");
};
!
999px

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