How to show react-datepicker date when submit is clicked?

Question

Working with date/time

When you click on the "Add consultation" button, a popup opens in which there is an input in which I write the name and date selection so that the text is displayed, I did it, and so that when the date is selected, it is displayed not in the console, but next to the name of the consultation. The problem is that I can not get the selected date from the DatePicker component and display it.
Thanks for the answer.

import React, {Component} from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import DatePicker from 'react-datepicker';

import "react-datepicker/dist/react-datepicker.css";

class App extends Component {
  
  constructor(props) {
    super(props);

    this.state = {
      showPopup: false,
      formState: {
        date: '',
        id: '',
        firstName: '',
        mode: 'submit',
        startDate: new Date()
      },
      users: [
        {
          id: 0,
          firstName: 'Video consultation 1 with your matchmaker',
          date: ''
        }
      ]
    };
    this.handleChange = this.handleChange.bind(this);
    // this.onFormSubmit = this.onFormSubmit.bind(this);
  }

  handleChange(date) {
    this.setState({
      startDate: date
    })
  }
  // onFormSubmit(e) {
  //   e.preventDefault();
  //   console.log(this.state.startDate)
  // }

  resetFormState = () => {
    this.setState({
      formState: {
        firstName: '',
        lastName: "",
        mode: 'submit',
        id: ''
      }
    });
  };

  onChange = event => {
    this.setState({
      formState: {
        ...this.state.formState,
        [event.target.name]: event.target.value,
      },
      
    });
  };

  onSubmit = (event) => {
    const { users, formState } = this.state;
    event.preventDefault();
    console.log(this.state.startDate)
  
    const date = this.state.startDate;
    const firstName = event.target.querySelector('input[name="firstName"]').value;
    if (formState.mode === 'submit') {
      this.setState({
        users: [
          ...this.state.users,
          {
            firstName,
            date
          }
        ]
      });
      this.setState({
        showPopup: !this.state.showPopup
      });
    } 

    this.resetFormState();

  };
  togglePopup() {
    this.setState({
      showPopup: !this.state.showPopup
    });
  }
  
  render() {
    const { users, formState } = this.state;
    return (
      <div>
     
        <hr/>

        <button className='button_show' onClick={this.togglePopup.bind(this)}>Add consultation</button>
        {this.state.showPopup ? 
          <div>
            <div className='popup' onClick={this.togglePopup.bind(this)}>
      
            </div>

            <div className='popup_inner'>
 
                <button className='Button_Close' onClick={this.togglePopup.bind(this)}>X</button>

                
                <Form 
                  formState={formState}
                  onChange={this.onChange}
                  onSubmit={this.onSubmit}
                />
            </div>
          </div>
          : null
          }
        
        <Table 
          users={users}

        />
        {/* <h3>React Form</h3>
        <FormContainer /> */}
        
      </div>
    );
  }
}

class Table extends Component {
  constructor(props) {
    super(props);
    
  }
  
  render() {
    return (
      <div className='table'>
        <div className='table-header'>
          <div className='row'>
            {/* <div className='column'>Name consultation</div> */}
          </div>
        </div>
        <div className='table-body'>
          {this.props.users.map((user, index, ) => {
            return (
              <div key={index} className={`row ${user.updating ? 'updating' : ''}`}>
                <div className='column'>{user.firstName}</div>
                <div className='column'>{user.date}</div>
              </div>
            );
          })}
        </div>
      </div>
    );
  }
}

class Field extends Component {
  constructor(props) {
    super(props);

    this.state = {
      // startDate: new Date(),
      formState: {
        startDate: new Date()
      },
      // users: [
      //   {
      //     date: ''
      //   }
      // ]
    };
    this.handleChange = this.handleChange.bind(this);
  }
  handleChange(date) {
    this.setState({
      startDate: date
    })
  }

  render() {
    console.log(this.state.startDate)
    // const { users, formState } = this.state;
    return (
      <div className='field'>   
      <label htmlFor={this.props.name}>{this.props.label}</label>
      <input type='text' name={this.props.name} value={this.props.value} onChange={this.props.onChange} />

      <label>Enter date: </label>
        <DatePicker
          placeholderText='Enter "date"'
          selected={ this.state.startDate }
          onChange={ this.handleChange }
          showTimeSelect
          timeFormat="HH:mm"
          timeIntervals={20}
          timeCaption="time"
          dateFormat="MMMM d, yyyy h:mm aa"
        />
    </div>
    )
  }
}

class Form extends Component {
  constructor(props) {
    super(props);
    
  }
  
  render() {
    return (
      <form className='form' onSubmit={this.props.onSubmit}>
        <fieldset>
        
          <Field 
            name='firstName'
            label='Name consultation'
            value={this.props.formState.firstName}
            onChange={this.props.onChange}
          />
          {/* <Field 
            name='lastName'
            label='Last Name consultation'
            value={formState.date}
            onChange={onChange}
          /> */}
        </fieldset>
        <button>{this.props.formState.mode}</button>
      </form>
    )
  }
}


ReactDOM.render(<App />,
  document.querySelector('#root'));