⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API

⏳ Modern JavaScript date utility library ⌛️

⚡ A Fast, Extensible Progress Bar for Python and CLI

😱 Falsehoods Programmers Believe in

🏹 Better dates & times for Python

The mobile-friendly, responsive, and lightweight jQuery date & time input picker.

Python datetimes made easy

The automatic work journal. Privately turns your screen into a timeline of what you actually accomplished. Open-source and local-first.

A simple, semantic and developer-friendly time package for golang

Now is a time toolkit for golang

Build Time Analyzer for Swift

📅 Easy!Appointments - Self Hosted Appointment Scheduler

Date and time library for Rust

🕗 The original jQuery plugin that makes it easy to support automatically updating fuzzy timestamps (e.g. "4 minutes ago").

Collection of advice on optimizing compile times of Swift projects.

Datetimes for Humans™

A gem providing "time travel", "time freezing", and "time acceleration" capabilities, making it simple to test time-dependent code. It provides a unified method to mock Time.now, Date.today, and DateTime.now in a single call.

A date and time library based on the C++11/14/17 <chrono> header

A React-Native datetime-picker for Android and iOS

A datetime library for Rust that encourages you to jump into the pit of success.