title: Make all dates except for certain ones disabled
body: <p>I am trying to make it so that in react-day-picker, only the dates that are available are selectable (i.e. A user is only available for two days, all those other days are disabled and unselectable). I've tried doing this method: </p>
  
  <pre><code>    &lt;DayPicker
        selectedDays={this.state.selectedDays}
        onDayClick={this.handleDayClick}
        disabledDays={(day =&gt; (day !== ServiceRequestEngagementCreateModal.availableDates(service.available_dates)))}
      /&gt;
  </code></pre>
  
  <p>But that makes all of the dates unavailable.</p>
  
  <p>Any help would be appreciated, thanks!</p>