convert-hrtime 
Convert the result of
process.hrtime()to seconds, milliseconds, nanoseconds
Install
$ npm install --save convert-hrtime
Usage
const convertHrtime = require('convert-hrtime');
convertHrtime(process.hrtime(process.hrtime()));
//=> {seconds: 0.000002399, milliseconds: 0.002399, nanoseconds: 2399}
License
MIT © Sindre Sorhus