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HTML

              
                <div id="app"></div>
              
            
!

CSS

              
                $dark-background: #444;
$dark-backgorund-hover: #333;
$dark-font-color: #ccc;

@import url('https://fonts.googleapis.com/css?family=Lato');

$dark-background: #444;
$dark-backgorund-hover: #333;
$dark-header-background: #555;
$dark-font-color: #ccc;
$arrow-color: #888;
$button-background-hover: #666;
$button-background-focus: #595959;
$button-padding: 15px;
$button-border-size: 8px;
$day-soft-color: #565656;

body {
  margin: 0;
  background-color: #777;
}

.calendar {
  color: $dark-font-color;
  float: left;
  font-family: 'Lato', sans-serif;
  height: 430px;
  margin-left: 50%;
  margin-top: 25px;
  position: relative;
  transform: translateX(-50%);
  width: 400px;
}

.calendar-header {
  background-color: $dark-header-background;
  float: left;
  font-size: 18px;
  height: 50px;
  line-height: 2.78;
  position: relative;
  text-align: center;
  width: 100%;
}

.button-container {
  height: 100%;
  position: relative;

  &--left {
    float: left;
  }

  &--right {
    float: right;
  }
}

.button-content {
  background-color: transparent;
  border: 0;
  cursor: pointer;
  float: left;
  height: 100%;
  padding-left: $button-padding;
  position: relative;
  transition: background .3s ease;

  &:hover {
    background-color: $button-background-hover;
  }

  &:focus {
    outline: 0;
  }

  &--left {
    &::before {
      border-bottom: $button-border-size solid transparent;
      border-right: $button-border-size solid $arrow-color;
      border-top: $button-border-size solid transparent;
      content: '';
      display: inline-block;
      height: 0;
      margin-right: 10px;
      vertical-align: middle;
      width: 0;

    }
  }

  &--right {
    &::before {
      border-bottom: $button-border-size solid transparent;
      border-left: $button-border-size solid $arrow-color;
      border-top: $button-border-size solid transparent;
      content: '';
      display: inline-block;
      height: 0;
      margin-right: 10px;
      vertical-align: middle;
      width: 0;
    }
  }
}

.week {
  float: left;
  width: 100%;
}

.weekday {
  background-color: $dark-background;
  float: left;
  height: 40px;
  line-height: 2.5;
  text-align: center;
  width: 14.28%;
}

.day {
  background-color: $dark-background;
  box-sizing: border-box;
  float: left;
  font-weight: 300;
  height: 50px;
  padding: 10px 0;
  position: relative;
  text-align: center;
  transition: background .2s ease;
  width: 14.28%;
  z-index: 999;

  &--soft {
    color: $day-soft-color;
  }
}
              
            
!

JS

              
                class Calendar extends React.Component {
  constructor() {
    super();
    this.state = {
      days: [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
      months: [
        'January', 'February', 'March', 'April', 'May', 'June',
        'July', 'August', 'September', 'October', 'November', 'December',
      ],
      weekDays: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
      lastMonth: 11,
      month: 0,
      nextMonth: 1,
      year: 0,
      currentMonth: 0,
      currentYear: 0,
      calendar: [
        { id: 'week-1', data: [0, 0, 0, 0, 0, 0, 0] },
        { id: 'week-2', data: [0, 0, 0, 0, 0, 0, 0] },
        { id: 'week-3', data: [0, 0, 0, 0, 0, 0, 0] },
        { id: 'week-4', data: [0, 0, 0, 0, 0, 0, 0] },
        { id: 'week-5', data: [0, 0, 0, 0, 0, 0, 0] },
        { id: 'week-6', data: [0, 0, 0, 0, 0, 0, 0] },
      ],
      holidays: [],
      holiday: '',
    };

    this.previousCalendar = this.previousCalendar.bind(this);
    this.nextCalendar = this.nextCalendar.bind(this);
  }

  componentWillMount() {
    const now = new Date();
    const currentMonth = now.getMonth();
    const currentYear = now.getFullYear();

    this.setState({
      currentMonth,
      currentYear,
      month: currentMonth,
      year: currentYear,
    });

    this.setCalendar(new Date(currentYear, currentMonth, 1));
  }

  setMonth(date) {
    const month = date.getMonth();
    const lastMonth = month === 0 ? 11 : month - 1;
    const nextMonth = month === 11 ? 0 : month + 1;

    this.setState({
      lastMonth,
      month,
      nextMonth,
    });

    return { lastMonth, month, nextMonth };
  }

  setCalendar(date) {
    const { lastMonth, month, nextMonth } = this.setMonth(date);
    const year = date.getFullYear();
    const weekday = date.getDay();
    const days = this.checkLeapYear(year);
    let nextMonthDay = 0;

    const firstWeek = this.state.calendar[0].data.map((day, index) => {
      let holiday = '';
      if (index < weekday) {
        const value = (days[lastMonth] - (weekday - index)) + 1;
        return {
          value,
          class: 'day--soft',
          month: lastMonth,
        };
      }
      const value = (index - weekday) + 1;
      return {
        value: (index - weekday) + 1,
        class: '',
        month,
      };
    });
    const secondWeek = this.state.calendar[0].data.map((day, index) => {
      const value = firstWeek[6].value + index + 1;
      return {
        value,
        class: '',
        month,
      };
    });
    const thirdWeek = this.state.calendar[0].data.map((day, index) => {
      const value = secondWeek[6].value + index + 1;
      return {
        value,
        class: '',
        month,
      };
    });
    const forthWeek = this.state.calendar[0].data.map((day, index) => {
      const value = thirdWeek[6].value + index + 1;
      return {
        value,
        class: '',
        month,
      };
    });
    const fifthWeek = this.state.calendar[0].data.map((day, index) => {
      if (forthWeek[6].value + index + 1 > days[month]) {
        nextMonthDay += 1;
        return {
          value: nextMonthDay,
          class: 'day--soft',
          month: nextMonth,
        };
      }
      const value = forthWeek[6].value + index + 1;
      return {
        value,
        class: '',
        month,
      };
    });
    const sixthWeek = this.state.calendar[0].data.map((day, index) => {
      if (fifthWeek[6].value + index + 1 > days[month] || fifthWeek[6].value < 10) {
        nextMonthDay += 1;
        return {
          value: nextMonthDay,
          class: 'day--soft',
          month: nextMonth,
        };
      }

      const value = fifthWeek[6].value + index + 1;
      return {
        value,
        class: '',
        month,
      };
    });

    this.setState({
      month,
      year,
      calendar: [
        { id: 'week-1', data: firstWeek },
        { id: 'week-2', data: secondWeek },
        { id: 'week-3', data: thirdWeek },
        { id: 'week-4', data: forthWeek },
        { id: 'week-5', data: fifthWeek },
        { id: 'week-6', data: sixthWeek },
      ],
    });
  }

  checkLeapYear(year) {
    let days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    if ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0) {
      days = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    }
    this.setState({
      days,
    });
    return days;
  }

  previousCalendar() {
    const month = this.state.month !== 0 ? this.state.month - 1 : 11;
    const year = this.state.month !== 0 ? this.state.year : this.state.year - 1;
    this.setCalendar(new Date(year, month, 1));
  }

  nextCalendar() {
    const month = this.state.month !== 11 ? this.state.month + 1 : 0;
    const year = this.state.month !== 11 ? this.state.year : this.state.year + 1;
    this.setCalendar(new Date(year, month, 1));
  }

  render() {
    console.log(this.state.calendar);
    return (
      <div className="calendar">
        <div className="calendar-header">
          <span className="button-container button-container--left">
            <button onClick={this.previousCalendar} className="button-content button-content--left" />
          </span>
          <span className="calendar-header-date">{`${this.state.year} ${this.state.months[this.state.month]}`}</span>
          <span className="button-container button-container--right">
            <button onClick={this.nextCalendar} className="button-content button-content--right" />
          </span>
        </div>
        <div className="week">
          {this.state.weekDays.map(weekDay => <div key={weekDay} className="weekday">{weekDay}</div>)}
        </div>
        {this.state.calendar.map(week =>
          <div key={week.id} className="week">
            {week.data.map(day =>
              <div
                key={`${day.month}${day.value}`}
                className={`day ${day.class}`}
              >
                {day.value < 10 && day.value !== ' ' ? `0${day.value}` : day.value}
              </div>,
            )}
          </div>,
        )}
      </div>
    );
  }
}


/*
 * Render the above component into the div#app
 */
ReactDOM.render(<Calendar />, document.getElementById('app'));
              
            
!
999px

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