Luxon is a library for working with dates and times in Javascript. It supports DateTime, Duration, and Interval types. It is Immutable, chainable and it can parse and formatting for common and custom formats. 

Luxon -  A library for working with dates and times in JS

Lightweight customizable cross-browser jQuery datepicker, built with es5 and css-flexbox. Works in all modern desktop and mobile browsers (tested on Android 4.4+ and iOS8+).

Air Datepicker - Lightweight customizable cross-browser jQuery datepicker

Datejs is an open source JavaScript Date library for parsing, formatting and processing. Comprehensive, yet simple, stealthy and fast. Datejs has passed all trials and is ready to strike. Datejs doesn’t just parse strings, it slices them cleanly in two.

Datejs - A JavaScript Date Library

Joda-Time provides a quality replacement for the Java date and time classes. The standard date and time classes prior to Java SE 8 are poor. By tackling this problem head-on, Joda-Time has become the de facto standard date and time library for Java. The design allows for multiple calendar systems, while still providing a simple API. The 'default' calendar is the ISO8601 standard which is used by XML. The Gregorian, Julian, Buddhist, Coptic, Ethiopic and Islamic systems are also included.

Joda Time - Java Date and Time API

Date is an english language date parser for node.js and the browser. date.js now has much better NLP support.

date - Date() for humans

This jQuery plugin leverages Jon Nylander's jstimezonedetect (based on work by Josh Fraser). It could able to set the current timezone value by calling .val on the selector. This generally assumes the selector is an input (text or hidden). It is also retrieves current browser timezone. 

jQuery Detect TimeZone Plugin

PrettyTime is an OpenSource time formatting library. Completely customizable, it creates human readable, relative timestamps like those seen on Digg, Twitter, and Facebook. It has support for over 30 languages.

PrettyTime - Social Style Date and Time Formatting for Java

This API calculates the holidays for a given year, country and region or lets you provide your own holiday rules. Uses XML files for storing the holiday data. Uses JODA date/time API. Supports Europe, North/South America, Australia, Russia, India ...

Jollyday - A holiday API

An easy-to-use Java-based calendar converter - able to convert between various known calendars.

Almanac Converter -  A Java-based calendar converter

Time4A is an advanced Date and Time Library for Android. This project is a specialized version of Time4J-v3.x (using the branch level6 - starting with version v3.5) and distributes an AAR-library suitable for the Android platform. It is not modularized like Time4J itself, but its (single) artifact "time4j-android" replaces the Time4J-modules "core", "i18n", "calendar", "olson" and "tzdata". Hence the only Time4J-modules which might be combined with this AAR-library are just "misc" and "range" if needed.

Time4A - Advanced Date and Time Library for Android

Backport of functionality based on JSR-310 to JDK1.7. This is NOT an implementation of JSR-310. Instead, this is a simple backport intended to allow users to quickly use the JSR-310 API on Java SE 6 and 7. The backport should be referred to using the "ThreeTen" name.

ThreeTen - Backport of DateTime functionality based on JSR-310 to Java SE 6 and 7

Human readable interval parser for Javascript. Human Interval supports numbers up to ten being written out in English. If you want to extend it, you can do so by adding more keys to the language map. Alternatively you could add support for alternative languages.

Human Interval - Human readable time distances for javascript

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Luxon - A library for working with dates and times in JS