JSFiddle - React, Tailwind, and code Playground

JavaScript

var d = new Date();
var dayOfWeek = d.getDay(); // 0 = Sunday
var hour = d.getHours();

if ( [4,5,6].indexOf(dayOfWeek) > -1 && hour >= 17 && hour < 19 ){
  console.log("true");
} else {
  console.log("false"); 
}