JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<input type="submit" id="submit" name="submit">

JavaScript

updateSubmitButtonState();

function updateSubmitButtonState() {
var timezone = "Asia/Calcutta";
    var currentTime = new Date();
    var hours = currentTime.getHours();
    var minutes = currentTime.getMinutes();
    var t = getDateObj(currentTime.getHours()  + ":" + currentTime.getMinutes());

 if (t >= getDateObj('10:00') && t <= getDateObj('10:20') || 
    t >= getDateObj('11:00')  && t <= getDateObj('11:20') || 
    t >= getDateObj('13:00')  && t <= getDateObj('13:20') || 
    t >= getDateObj('15:15')  && t <= getDateObj('15:25') || 
    t >= getDateObj('17:30')  && t <= getDateObj('17:40') || 
    t >= getDateObj('19:00')  && t <= getDateObj('19:10') || 
    t >= getDateObj('20:30')  && t <= getDateObj('20:40') ) {
    $("#submit").css("display", "none");
  } else {
    $("#submit").css("display", "block");
  }
}

function getDateObj(timeStr) {
	return new Date('01/01/2017 '+timeStr+':00');
}