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iamkun avatar

iamkun/dayjs

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Dayjs

Day.js is a lightweight utility for parsing, validating, and manipulating date objects. It provides a fluent, chainable interface that allows for complex time calculations and transformations to be performed through a sequence of readable method calls. By utilizing an immutable wrapper pattern, the library ensures data integrity by creating new instances for every operation rather than modifying existing objects.

The project is distinguished by a minimalist core abstraction that maintains a small footprint by offloading non-essential features to an optional, modular plugin system. This architecture allows developers to extend functionality or add specialized formatting capabilities by registering independent modules only when needed. Furthermore, the library includes an internationalization engine that supports dynamic, lazy loading of locale data to keep bundle sizes minimal while respecting regional date and time conventions.

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day.js.org
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Features

  • Date and Time Libraries - Creates new date objects whenever values change to ensure data integrity during complex calculations.
  • Date Manipulation Utilities - Parses, validates, and transforms time data using a chainable interface for consistent formatting.
  • Immutable Date Libraries - A lightweight utility for parsing, validating, and manipulating date objects using immutable transformation patterns.
  • Chainable Date Utilities - Provides a fluent interface for performing complex time calculations through readable method calls.
  • Fluent Date Processing - Simplifies common time-based operations through a chainable interface that makes transformations readable.
  • Immutable Date Processing - Performs complex date and time calculations while ensuring data integrity by creating new instances.
  • Immutable Data Patterns - Wraps native date objects in new instances for every operation to ensure data integrity and prevent unintended side effects.
  • Modular Architectures - Maintains a tiny footprint by offloading all non-essential features to an optional plugin system.
  • Modular Plugin Architectures - A flexible extension system that allows adding specialized formatting without increasing the core bundle size.
  • Date And Time - Immutable date library alternative.
  • Date and Time Utilities - Minimalist, immutable date library with a Moment-compatible API.
  • Date Utilities - Immutable date library with a modern API.
  • Dates and Time - Minimalist library with a Moment.js-compatible API.
  • Utility and Math - Date and time library.
  • Date and Time - 2kb alternative to Moment.js.
  • Plugin Systems - Extends core functionality by injecting custom methods directly into the prototype chain through a modular registration system.
  • Internationalized Date Formatting - Displays dates and times in a way that respects specific language and regional conventions.
  • Localization Tools - Applies internationalization settings on demand to display dates and times according to regional conventions.
  • Modular Library Extensions - Adds specialized features or custom functionality to a core utility without increasing the base codebase size.
  • Internationalization Engines - Transforms date and time values into region-specific formats based on dynamic language settings.
  • Internationalization Utilities - Loads internationalization data dynamically only when requested to keep the initial bundle size minimal.
  • Extensibility Frameworks - Allows adding specialized formatting or advanced capabilities by registering independent modules.
  • Fluent Interfaces - Provides a chainable interface that allows multiple date transformations to be linked together in a single statement.
48,662 stars·2,449 forks·JavaScript·MIT·26 views

Star history

Star history chart for iamkun/dayjsStar history chart for iamkun/dayjs

How this analysis was created: This summary and feature list are AI-generated from collected project material and can contain mistakes. Stars, license and language are imported from GitHub. Inclusion does not mean that we have tested or audited this project. Check the source documentation for any feature you depend on. Learn more on our About page.

Frequently asked questions

What does iamkun/dayjs do?

Day.js is a lightweight utility for parsing, validating, and manipulating date objects. It provides a fluent, chainable interface that allows for complex time calculations and transformations to be performed through a sequence of readable method calls. By utilizing an immutable wrapper pattern, the library ensures data integrity by creating new instances for every operation rather than modifying existing objects.

What are the main features of iamkun/dayjs?

The main features of iamkun/dayjs are: Date and Time Libraries, Date Manipulation Utilities, Immutable Date Libraries, Chainable Date Utilities, Fluent Date Processing, Immutable Date Processing, Immutable Data Patterns, Modular Architectures.

Which projects share features with iamkun/dayjs?

Projects with overlapping indexed features include: moment/luxon — Luxon is a JavaScript library for parsing, validating, manipulating, and formatting dates and times. It provides a… date-fns/date-fns — date-fns is a JavaScript date utility library providing a collection of pure functions for manipulating, formatting,… moment/moment — Moment is a JavaScript date manipulation library used for parsing, validating, manipulating, and formatting dates and… formkit/tempo — Tempo is a JavaScript date manipulation library that provides a suite of tools for parsing, formatting, and… malcommac/swiftdate — SwiftDate is a date manipulation library for the Swift programming language. It provides a toolkit for parsing,… hustcc/timeago.js — timeago.js is a JavaScript library that converts timestamps into human-readable relative time strings. It functions as…

Projects sharing features with Dayjs

These projects share indexed features with Dayjs. Shared tags can include platform or build tooling; verify the primary use case before treating a result as a replacement.
  • moment/luxonmoment avatar

    moment/luxon

    16,360View on GitHub↗

    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

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  • date-fns/date-fnsdate-fns avatar

    date-fns/date-fns

    36,579View on GitHub↗

    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

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  • moment/momentmoment avatar

    moment/moment

    47,965View on GitHub↗

    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

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  • formkit/tempoformkit avatar

    formkit/tempo

    2,581View on GitHub↗

    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

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