A 2kB immutable date-time library for modern browsers with a Moment.js-compatible API.
Day.js is a lightweight JavaScript library for working with dates and times in web applications. It provides parsing, validation, manipulation, and formatting capabilities with an API designed to be compatible with Moment.js. The library solves the problem of heavy date-time dependencies by offering similar functionality in a minimal 2kB package.
Frontend and JavaScript developers who need date manipulation in their applications, especially those migrating from Moment.js or concerned about bundle size.
Developers choose Day.js for its tiny footprint and familiar API, allowing them to replace Moment.js without rewriting code. Its immutable design and plugin system offer flexibility while keeping bundles small.
⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API
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At only 2kB minified and gzipped, it significantly reduces bundle impact compared to Moment.js, as highlighted in the README's badge and description.
Uses the same API patterns as Moment.js, making migration straightforward with minimal code changes, as stated in the project summary.
All operations return new instances, preventing accidental mutations and improving code predictability, a key feature emphasized in the philosophy.
Functionality can be extended via on-demand plugins, allowing customization without bloating the core library, as shown in the plugin examples.
Supports multiple locales that load only when needed, keeping bundles small, as demonstrated in the i18n documentation.
Core library is minimal; features like timezone support or advanced formatting require plugins, adding setup complexity and potential maintenance overhead.
Compared to full-featured alternatives, it lacks built-in capabilities for common tasks like relative time, forcing reliance on plugins or custom code.
While core is small, adding multiple plugins can increase bundle size, undermining the minimalism if not carefully managed, as plugins are separate modules.