this.state.attributes.startDate = ''
this.state.attributes.endDate = ''

<Select
  className='form-control'
  name='endDate'
  value={attributes.endDate}
  required={true}
  onChange={e => {
    this.updateAttribute(e, 'startDate')
  }}
  options={this.options}
/>

updateAttribute = (e: ReactEvent, attribute: string) => {
  e.preventDefault && e.preventDefault()

  const attributes = {
    ...this.state.attributes,
    [attribute]: e.target ? e.target.value : e
  }
  this.setState({ attributes: attributes }, () => this.submitForm())
}