@slime/stopwatch
a stopwatch class utility for starting, pausing, resetting and getting elapsed time in milliseconds (ms), under the hood is just comparing timestamps with Date.now().
ez-local-time
The easiest way to deal with local times, dates, and time zones in JavaScript. No heavy API, like Moment.js, just local times, dates, and time zones using the JavaScript Date API.
@jkroso/now
get the highest resolution timestamp available x-browser