JSFiddle - React, Tailwind, and code Playground

JavaScript

var start_time = "2015-05-12";
var end_time ="2015-05-14";
var start_time_split ="05:30";
var end_time_split ="22:30";

var d1= new Date(start_time);
var d2 = new Date(end_time);
var ms1 = d1.valueOf();
var ms2 = d2.valueOf();

var diff_ms = ms2-ms1;
var diff_hrs = diff_ms / 3600000;
alert(d1);
alert(d2);
alert(diff_hrs);