var E_TIME = 20.5714285714; var global = { utcTime: null, eorzeaTime: null }; window.setInterval(updateClock, Math.floor(1000 * 60 / E_TIME)); function updateClock() { global.utcTime = new Date().getTime(); var eo_timestamp = Math.floor(global.utcTime * E_TIME); global.eorzeaTime = new Date(); global.eorzeaTime.setTime(eo_timestamp); showTime(); } function showTime() { var d = new Date(); d.setTime(global.eorzeaTime); var eTime = document.getElementById('e-time'); var hours = d.getUTCHours(); var ampm = hours > 11 ? "PM" : "AM"; if(hours > 12) hours -= 12; hours = padLeft(hours); var minutes = d.getUTCMinutes(); minutes = padLeft(minutes); eTime.innerHTML = hours + ":" + minutes + " " + ampm; } function padLeft(val){ var str = "" + val; var pad = "00"; return pad.substring(0, pad.length - str.length) + str; } updateClock();

<div id='e-time'></div>