Moment JS
Example of parsing and formatting a Date with Moment JS.
HTML
<script src="http://momentjs.com/downloads/moment.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>
JavaScript
373.477875
let test1 = 186685375
let test2 = 186792500
console.log((parseFloat(test1) + parseFloat(test2))/1000000)