mue/src/components/widgets/time/Clock.jsx

import React from 'react';

import Analog from 'react-clock';

import './clock.scss';

export default class Clock extends React.PureComponent {
  constructor(...args) {
    super(...args);

    this.timer = undefined;
    this.state = {
      time: '',
      ampm: ''
    };
  }

  startTime(time = localStorage.getItem('seconds') === 'true' || localStorage.getItem('timeType') === 'analogue' ? (1000 - Date.now() % 1000) : (60000 - Date.now() % 60000)) {
    this.timer = setTimeout(() => {
      const now = new Date();

      const timeType = localStorage.getItem('timeType');

      // Percentage
      if (timeType === 'percentageComplete') {
        return this.setState({
          time: (now.getHours() / 24).toFixed(2).replace('0.', '') + '%'
        });
      }

      // Analog clock
      if (timeType === 'analogue') {
        // load analog clock css
        require('react-clock/dist/Clock.css');

        this.setState({
          time: now
        });
      } else {
        // Default clock
        let time, sec = '';
        const zero = localStorage.getItem('zero');

        if (localStorage.getItem('seconds') === 'true') {
          if (zero === 'false') {
            sec = ':' + now.getSeconds();
          } else {
            sec = `:${('00' + now.getSeconds()).slice(-2)}`;
          }
        }

        if (localStorage.getItem('24hour') === 'true') {
          if (zero === 'false') {
            time = `${now.getHours()}:${now.getMinutes()}${sec}`;
          } else {
            time = `${('00' + now.getHours()).slice(-2)}:${('00' + now.getMinutes()).slice(-2)}${sec}`;
          }

          this.setState({
            time: time
          });
        } else {
          // 12 hour support
          let hours = now.getHours();

          if (hours > 12) {
            hours -= 12;
          }

          // Toggle AM/PM
          let ampm = now.getHours() > 11 ? 'PM' : 'AM';
          if (localStorage.getItem('ampm') === 'false') {
            ampm = '';
          }

          if (zero === 'false') {
            time = `${hours}:${now.getMinutes()}${sec}`;
          } else {
            time = `${('00' + hours).slice(-2)}:${('00' + now.getMinutes()).slice(-2)}${sec}`;
          }

          this.setState({
            time: time,
            ampm: ampm
          });
        }
      }

      this.startTime();
    }, time);
  }

  componentDidMount() {
    this.startTime(0);
  }

  render() {
    let clockHTML = <h1 className='clock'>{this.state.time}<span className='ampm'>{this.state.ampm}</span></h1>;

    if (localStorage.getItem('timeType') === 'analogue') {
      clockHTML = <Analog className='analogclock' value={this.state.time} renderHourMarks={false} renderMinuteMarks={false} />;
    }

    return clockHTML;
  }
}