Day.js
Day.js is a minimalist 2kb JavaScript library that parses, validates, manipulates, and displays dates and times for modern browsers with a largely Moment.js-compatible API.
Dates & Times
Luxon
A powerful, modern, and friendly wrapper for JavaScript dates and times. DateTimes, Durations, and Intervals Immutable, chainable, unambiguous API.
Date-fns
Modern JavaScript Date Utility Library. date-fns provides the most comprehensive yet simple and consistent toolset for manipulating JavaScript dates in a browser & Node.js.