<script>
 window.addEventListener("load", function() {
  // Check time and update the button's state every second.
  setInterval(updateSubmitButtonState, 1000);
}, false);

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

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

<input type="submit" id="submit" name="submit">