⏰ 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.

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

Datetimes for Humans™

A React-Native datetime-picker for Android and iOS

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