src/components/Duration/Panel/currentTimePanel.js

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import React, { PureComponent } from 'react';

class CurrentTimePanel extends PureComponent {
  state = {
    currentTime: null,
  }

  componentDidMount() {
    this.clock = setInterval(this.timer, 1000)
  }

  componentWillUnmount() {
    clearInterval(this.countdown);
  }

  timer = () => {
    const { moment } = this.props;
    this.setState({ currentTime: moment() });
  }

  render() {
    const { currentTime } = this.state;
    return currentTime == null ? null : currentTime.format("YYYY-MM-DD HH:mm:ss");
  }
}

export default CurrentTimePanel;