The JMCNet library ported to JS : send email, manage html email template, use .properties files, resource bundle for i18n and add some usefull date methods

Some important Native JS Date methods

Date formatter with more date methods!

Some Untility Date methods

date methods for javascript

A library that has a custom date object and additional Date methods

Avoid using native date methods

Internationalized calendar, date, and time manipulation utilities

Proper decorator-based transformation / serialization / deserialization of plain javascript objects to class constructors

A blazing-fast equality comparison utility for a variety of use-cases

serialize objects to javascript

Efficient Binary heap (priority queue, binary tree) data structure for JavaScript / TypeScript. Includes JavaScript methods, Python's heapq module methods, and Java's PriorityQueue methods.

Good Enough Date: Useful date methods

Encode/decode circular structures for converting to and from JSON.

A Modern JavaScript Date Library

A calculator for humanity’s peculiar conventions of time.

Dead simple Object schema validation

simple date math util

Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Calculates Easter for a given year