react-datepickerでCustomInputを指定するサンプル

App.js

import React, { Component } from 'react';
import moment from 'moment'
import logo from './logo.svg';
import './App.css';
import DatePickerWrapper from './DatePickerWrapper';

class App extends Component {
  state = {
    selectedDate: moment()
  }

  handleChange = (date) => {
    this.setState({ selectedDate: date })
  }

  render() {
    return (
      <div className="App">
        <header className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h1 className="App-title">Welcome to React</h1>
        </header>
        <p className="App-intro">
          To get started, edit <code>src/App.js</code> and save to reload.
        </p>
        <DatePickerWrapper
          selectedDate={this.state.selectedDate}
          onChange={this.handleChange}
        />
      </div>
    );
  }
}

export default App;

DatePickerWrapper.js

import React from 'react'
import DatePicker from 'react-datepicker'

import 'react-datepicker/dist/react-datepicker.css'
import 'font-awesome/css/font-awesome.css'

class CustomInput extends React.Component {
  render() {
    return (
      <button
        onClick={this.props.onClick}
      >
        {this.props.value} <span className="fa fa-calendar" />
      </button>
    )
  }
}

const DatePickerWrapper = (props) => {
  return (
    <DatePicker
      selected={props.selectedDate}
      customInput={<CustomInput />}
      onChange={props.onChange}
    />
  )
}

export default DatePickerWrapper