Open-source alternatives to Pendulum

Tempo is a JavaScript date manipulation library that provides a suite of tools for parsing, formatting, and calculating dates and times. It serves as a date arithmetic engine, a locale-aware formatter, and a timezone offset manager for native JavaScript date objects. The library includes a dedicated ISO 8601 date parser for validating and converting standardized strings into date objects. It handles geographic normalization through IANA timezone offset management and utilizes the native Internationalization API for region-specific date formatting. The project covers a broad range of date and

Spacetime is a JavaScript timezone library and date manipulation framework designed for parsing, formatting, and managing dates across global timezones. It provides an internationalization tool for localizing date components and includes static type definitions for TypeScript environments to ensure type checking and autocompletion. The project features a plugin system for custom date logic, allowing the injection of specialized methods and behaviors into date objects. This extensibility enables the implementation of project-specific time requirements through prototype-based method extensions.

This project is a proposal for a new immutable date and time API in JavaScript. It serves as a precision time-tracking library and a multi-calendar date engine designed to replace the legacy Date object. The system is distinguished by its support for multiple calendar systems beyond the ISO standard and its use of IANA-based time zone resolution. It provides a framework for managing daylight saving transitions and UTC offsets while maintaining nanosecond precision for global timestamps. The API covers broad functional areas including complex date and time arithmetic, locale-aware formatting,

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

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

pysheeet is a technical reference library providing a curated collection of code snippets and implementation patterns for advanced Python development, system integration, and high-performance computing. It serves as a comprehensive guide for implementing low-level network programming, native C extensions, and asynchronous and concurrent programming. The project provides specialized frameworks for the development and deployment of large language models, including tools for distributed GPU inference and high-performance serving. It also includes detailed patterns for high-performance computing

30 Seconds of Python is a curated collection of short, reusable Python code snippets designed for quick reference and immediate reuse. It provides an interactive browser that lets you explore snippets organized by tags, search across names and descriptions, and copy code to your clipboard with a single click. The collection covers a broad range of common programming tasks, including list and dictionary operations, string formatting and manipulation, date and time calculations, and color format conversion. It also includes utilities for data transformation, such as converting between case styl

Flatpickr is a lightweight, dependency-free JavaScript library designed to provide a modular date and time selection interface for web applications. It functions as a versatile web component that integrates into existing forms, offering a consistent user experience for picking single dates, ranges, or multiple values while maintaining a clear separation between human-readable display strings and machine-readable data. The library distinguishes itself through a robust configuration-driven architecture that allows for dynamic runtime updates and extensive customization of date formatting via a

Sprig is a comprehensive library of helper functions designed to extend the Go text template engine. It provides a wide array of custom functions that can be injected into the engine to enable complex data manipulation and logic directly within templates. The project offers specialized capabilities for cryptography, including the generation of private keys, X.509 certificates, and secure password hashes. It also includes advanced logic extensions for semantic versioning comparison, ternary evaluations, and the resolution of environment variables from the host operating system. The library co

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.

sqlean is a collection of SQLite extension libraries implemented as C-based shared libraries. It provides a suite of additional scalar and table-valued functions that expand the native capabilities of the SQLite database engine. The project provides specialized toolsets for cryptography, advanced mathematics, networking, and filesystem access. These include binary hashing and encoding, statistical analysis, IP address validation, and the ability to map CSV files or filesystem paths as virtual tables. The library also includes comprehensive text processing tools such as regular expressions, f

date-fns is a JavaScript date utility library providing a collection of pure functions for manipulating, formatting, and calculating dates and times. It serves as an immutable date manipulation library and a tool for time zone management, ensuring that date transformations are performed without modifying the original date objects. The library functions as a date formatting tool that converts date objects into human-readable strings using custom patterns and international locales. It includes a specific toolset for adjusting and calculating date representations across different geographical re

This project is a comprehensive library of practical Python code examples and patterns. It provides a collection of scripts and snippets designed to demonstrate a wide range of programming tasks, from basic syntax to advanced implementation patterns. The repository focuses on several core domains, including the implementation of concurrency and multithreading examples, data analysis snippets for cleaning and manipulating tabular data, and various data visualization examples. It also covers automation scripts for file system management and a variety of general programming patterns. Additional

DataFrame is a C++ tabular data library and manipulation engine designed for managing heterogeneous data in contiguous memory. It functions as a statistical analysis framework and time series analysis toolkit, providing the means to store, index, and transform multidimensional datasets. The project distinguishes itself through a high-performance execution model that utilizes column-major storage, SIMD-aligned memory allocation, and a thread-pool for parallel computations. It employs a visitor-based algorithm dispatch system and policy-driven transformations to decouple data processing logic f

Pikaday is a lightweight JavaScript datepicker library and client-side date input manager. It provides a standalone calendar interface for selecting dates in web applications as a zero-dependency UI component that operates without external frameworks or libraries. The tool features a modular CSS architecture that separates structural logic from visual presentation, allowing for flexible customization of the calendar layout. It includes built-in support for calendar localization, enabling the update of month names and weekday labels to match specific languages or regions. The library manages

Pikaday is a lightweight JavaScript datepicker widget and dependency-free UI component. It provides a graphical calendar interface for selecting dates that binds to form fields without requiring external libraries or frameworks. The project features a localizable calendar interface, allowing for the customization of month names, weekday labels, and regional text directions to support multiple languages. Its programmable API manages input formatting and selection restrictions. The tool covers a broad range of date selection capabilities, including date input validation, range restrictions, an

SwiftDate is a date manipulation library for the Swift programming language. It provides a toolkit for parsing, validating, and formatting dates, times, and timezones. The library includes a relative time generator for producing date offsets based on reference points such as tomorrow or next week, and a localized date formatter for transforming date objects into human-readable strings across multiple languages and locales. It also features an ISO8601 date parser to convert standardized date strings from SQL, HTTP, and ISO8601 formats into structured objects, alongside tools for managing timez

This project is a comprehensive date and time library designed for parsing, formatting, and calculating dates and times with high precision. It provides a multi-calendar system implementation that supports conversions between proleptic Gregorian, Julian, ISO week, and Tabular Islamic calendars. The library is distinguished by its high-precision time clocks and its implementation of the IANA time zone database. It tracks physical time using UTC, TAI, and GPS clocks to account for leap seconds and provides a system for managing geographic time zones and offsets based on IANA data. The capabili

This project provides a web component time element that extends the standard HTML time tag to display human-readable relative timestamps and countdowns. It functions as a relative time formatter and time duration calculator, converting timestamps into localized strings that update automatically in the browser. The tool enables dynamic timestamp displays that transition from relative phrases to absolute dates based on configurable time thresholds. It includes capabilities for date tense restriction, forcing timestamps to display exclusively as past or future dates, and supports precise duratio

Now is a date and time manipulation library for Go designed to generate precise calendar boundaries and convert time strings into structured objects. It serves as a utility for calculating the start and end timestamps for days, weeks, months, and years. The project provides tools for calculating specific weekdays relative to a reference point and performing date arithmetic to determine time ranges. It includes a toolkit for parsing date and time strings using configurable layouts and formats. The library functions as a wrapper for the standard Go time package to provide an interface for comp

Sugar is a JavaScript utility library designed to extend native objects and prototypes with additional methods for data manipulation and transformation. It functions as a toolkit for object utilities, date manipulation, string inflection, and the polyfilling of missing or broken standard language features. The library provides the ability to map utility methods directly onto built-in prototypes or wrap values in temporary objects to enable method chaining without modifying global prototypes. It also includes a polyfill system to ensure consistent behavior across different execution environmen

DateTools is a date manipulation library for iOS applications that provides utilities for date arithmetic, range management, and relative time formatting. It functions as a set of tools to shift dates by specific units, calculate durations between timestamps, and convert dates into localized, human-readable strings. The library specializes in the analysis of time spans, offering systems to define, compare, and organize overlapping or sequential time periods. It includes logic to determine chronological relationships, such as whether dates fall within specific windows or how different time per

Joda-Time is a Java date and time library and framework used for parsing, representing, and calculating temporal data. It provides a thread-safe temporal API that uses immutable objects to ensure concurrency safety and adheres to the ISO8601 standard. The project is distinguished by its pluggable calendar system, which supports diverse chronologies including Gregorian, Buddhist, Coptic, Ethiopic, and Islamic calendars. It also functions as a time zone management tool, utilizing an internal IANA-based zone database to translate instants and update daylight savings rules independently of the ho

Globalize is a JavaScript internationalization library that uses Unicode Common Locale Data Repository JSON data to provide localization services. It functions as a locale-aware string formatter and a system for transforming dates, times, currencies, and numeric values into strings based on specific locale patterns. The library includes a precompiled localization engine that generates optimized formatting functions during the build process. This approach reduces runtime overhead and removes the requirement to load raw locale data at execution. The project covers a broad range of internationa

This project is an educational resource and a collection of instructional materials for performing data manipulation and statistical analysis using Python. It provides a comprehensive set of guides and code examples for using the Pandas, NumPy, and Matplotlib libraries to analyze structured data. The resource includes a dedicated guide for reshaping, cleaning, and aggregating tabular data and time series via Pandas, alongside a reference for high-performance vectorized operations and linear algebra using NumPy. It also features tutorials for creating publication-quality charts, distribution p

Freezegun is a Python time mocking library and system clock emulator used to freeze the system clock to a fixed date and time. It serves as a testing utility to ensure that time-dependent logic produces consistent and predictable results during software verification. The library provides an asyncio compatible mock that preserves real monotonic clock values to prevent event loops from hanging while other system time functions remain frozen. It supports simulating the passage of time through manual clock advancement, jumping to designated dates, or using a ticking clock simulation that incremen

Taiga UI is an Angular UI component library and accessible design system used for building enterprise web interfaces. It provides a comprehensive collection of reusable interface elements and layout tools, functioning as a mobile-first UI kit with responsive components that adapt to different device capabilities. The library distinguishes itself through an integrated data visualization library featuring various chart types and a dedicated form management framework with built-in validation and formatting for specialized data. It also features AI-driven development workflows by integrating comp