fecha
Date formatting and parsing
date-format
Formatting Date objects as strings since 2013
dayjs-with-plugins
Day.js with all plugins and locales added out of the box, no need to use dayjs.extend nor dayjs.locale!
@brightspace-ui/intl
Internationalization APIs for number, date, time and file size formatting and parsing in D2L Brightspace.
vega-format
JavaScript string formatting utilities for Vega.