redash/client/app/components/Timer.jsx

import React, { useMemo, useEffect } from 'react';
import moment from 'moment';
import PropTypes from 'prop-types';
import { react2angular } from 'react2angular';
import { Moment } from '@/components/proptypes';
import useForceUpdate from '@/lib/hooks/useForceUpdate';

export function Timer({ from }) {
  const startTime = useMemo(() => moment(from).valueOf(), [from]);
  const forceUpdate = useForceUpdate();

  useEffect(() => {
    const timer = setInterval(forceUpdate, 1000);
    return () => clearInterval(timer);
  }, []);

  const diff = moment.now() - startTime;
  const format = diff > 1000 * 60 * 60 ? 'HH:mm:ss' : 'mm:ss'; // no HH under an hour

  return (<span className="rd-timer">{moment.utc(diff).format(format)}</span>);
}

Timer.propTypes = {
  from: PropTypes.oneOfType([
    PropTypes.string,
    PropTypes.number,
    PropTypes.instanceOf(Date),
    Moment,
  ]),
};

Timer.defaultProps = {
  from: null,
};

export default function init(ngModule) {
  ngModule.component('rdTimer', react2angular(Timer));
}

init.init = true;