Open-source alternatives to Fecha

🗺️⏳ Count down to your events—visually and interactively! With React at its core, this project merges time and place, turning ordinary countdowns into engaging, map-based experiences.

moment-timezone is a JavaScript library and date manipulation extension designed for parsing and converting timestamps across different geographic regions. It serves as a JavaScript implementation of the Internet Assigned Numbers Authority database to manage global time offsets and daylight saving rules. The library provides regional localization and historical time zone analysis by mapping timestamps to geographic regions using official IANA data. It enables the translation of date and time strings between various zones while accounting for chronological records of clock transitions. The pr

timeago.js is a JavaScript library that converts timestamps into human-readable relative time strings. It functions as an internationalized date library that transforms static date and time data into descriptive statements of elapsed time. The project provides a dynamic time updater that automatically refreshes relative time labels on a webpage at regular intervals. It supports multilingual date localization, allowing time-elapsed statements to be translated into various languages using built-in or custom locale settings.

ms.js is a millisecond conversion library providing tools to format durations into text and parse human-readable time strings back into numbers. It functions as a utility for translating numeric millisecond values into human-readable strings and converting time units such as days, hours, and minutes into numeric milliseconds. The project covers time parsing and formatting, enabling the translation of human-readable time units into millisecond values for application timeout management and duration unit conversion. It includes tools for transforming millisecond durations into both concise and l

Date() for humans

Moment is a JavaScript date manipulation library used for parsing, validating, manipulating, and formatting dates and times. It provides a system for converting date strings into structured objects using the ISO 8601 standard or custom tokens. The library includes a timezone management tool for handling UTC offsets and geographic timezones, ensuring accurate date calculations across different regions. It features an internationalized date formatter and a relative time calculator to render timestamps as human-friendly durations adapted to various cultural locales and languages. The project co

This library is a client-side tool designed to transform static date strings into automatically updating, human-readable relative time labels within web interfaces. It functions as a plugin that scans the document for specific elements and converts their content into dynamic expressions, such as minutes or hours ago, to provide context for recent activity. The system distinguishes itself by decoupling display logic from JavaScript through attribute-driven configuration, allowing settings and date values to be managed directly within HTML. It maintains accuracy by employing interval-based poll

Super simple countdowns.

Luxon is a JavaScript library for parsing, validating, manipulating, and formatting dates and times. It provides a suite of immutable objects for managing points in time, durations, and intervals, ensuring that all transformations return new instances to maintain predictable state. The library distinguishes itself by leveraging the native Internationalization API and environment-based time zone databases. This architecture allows for localized date formatting and global time zone conversions without requiring external data files or additional dependencies. It also supports non-Gregorian calen

DEPRECATED: Timezone-enabled JavaScript Date object. Uses Olson zoneinfo files for timezone data.

is.js is a JavaScript validation library and data type checker. It provides a suite of utilities to verify whether variables are primitives, arrays, functions, or specific object types. The project allows for the implementation of custom validation logic and the use of naming namespaces to override default rules and regular expressions. It covers a broad range of validation capabilities, including numeric arithmetic properties, date and time analysis for relative and absolute ranges, and string format verification for patterns such as emails, URLs, and IP addresses. The library also includes

C99-compatible strftime formatter for use with Go time.Time instances.

A cron-style scheduler application for Elixir.

Simple React time input field

A date/time interval library for Elixir projects, based on Timex.

Moment is designed to bring easy date and time handling to Elixir.

⚛️📆 Flexible React date range picker calendar with no dependencies.

Automatically converts ISO 8601 date strings in JSON responses into native Date objects — deeply, safely, and blazingly fast.

Erlang Date and Time management is rather primitive, but improving.

flatpickr for React

Arrow is a Python date and time library designed for parsing, formatting, and manipulating date and time objects. It provides a simplified interface for these operations compared to the Python standard library. The library includes tools for converting standardized date strings via an ISO 8601 parser and transforming timestamps into human-readable relative strings across different locales. It also features a utility for translating timestamps between global timezones using location data objects. Additional capabilities cover date string formatting, time object generation, and the calculation

Angular Date Time Picker (Responsive Design)

Moment.js adapter for https://github.com/danielmoncada/date-time-picker

Go date utilities inspired by date-fns. Timezone-aware, WebAssembly-compatible, with comprehensive test coverage.

Useful extensions to the standard Python datetime features

Robust and type-safe date and time calculations for Swift

Arrow is a Python date and time library that provides a simplified interface for creating and manipulating timestamps by wrapping the Python standard library. It serves as a tool for managing date objects, handling timezone offsets, and performing relative date calculations. The library is distinguished by its ability to humanize timestamps into natural language relative descriptions across multiple locales and parse human-readable time phrases back into precise date objects. It also features a specialized parser for converting ISO 8601 strings and custom formatted text into date objects. Br