JSFiddle - React, Tailwind, and code Playground

HTML

<section class="cumcounter">
  <i class="emoji">
    🙀
  </i>
  <h1>
   It's been <span id="days" class="days"></span> days since the last launch of bryan's 🚀
  </h1>
</section>

CSS

body {
  background-color: #56BB81;
  color: #000;
  font-family: 'Lato', Sans-serif;
  padding: 50px;
}

.emoji {
  font-size: 7rem;
  font-style: normal;
}

.cumcounter {
  background-color: #FFF;
  border-radius: 10px;
  padding: 20px;
  text-align: center;
  box-shadow: 0px 0px 10px rgba(0,0,0,.2)
}

Babel + JSX

const daysDiv = document.getElementById('days')
const montharray =new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")

const countup = (yr,m,d) => {
  const today = new Date()
  let todayy = today.getYear()
  if (todayy < 1000)
  todayy+=1900
  const todaym=today.getMonth()
  const todayd=today.getDate()
  const todaystring=montharray[todaym]+" "+todayd+", "+todayy
  const paststring=montharray[m-1]+" "+d+", "+yr
  let difference=(Math.round((Date.parse(todaystring)-Date.parse(paststring))/(24*60*60*1000))*1)
  daysDiv.innerHTML = difference
}

countup(2016,10,9)