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A standalone DateTime library originally based off of Carbon
GitHub REST API client for JavaScript
Useful extensions to the standard Python datetime features
The home of the ICU project source code
Web component extensions to the standard <time> element
Go library for the TOML file format
Celery Periodic Tasks backed by the Django ORM
250+ constructs, recipes, and snippets which extend the Python library
JS library for working with recurrence rules for calendar dates
A massive head start on any size web application
Datetimes for Humans
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A complete date/time library for Elixir projects
An iCalendar library written in Java.