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    iamkun

    iamkun/dayjs

    ⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API

    api
    date
    date-formatting
    datetime
    dayjs
    moment
    JavaScript
    MIT
    48.7K stars
    4.4K forks
    48.7K GitHub watchers
    Updated Nov 1, 2026
    View on GitHub

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    Where it stands

    Rank, growth pace and release cadence relative to everything GStars tracks.

    2 releases in the last 90 days, the latest 75 days ago, with 338 contributors on GitHub.

    Gained 107% fewer stars in the last 90 days than in the 90 days before.

    Use Cases & Benefits

    • Provides a minimalist JavaScript library for parsing, validating, manipulating, and displaying dates and times with a Moment.js-compatible API.
    • Offers a lightweight 2kB immutable date-time library that supports chaining and internationalization, making it faster and smaller than Moment.js.
    • Use for replacing Moment.js in web projects to reduce bundle size while maintaining a familiar API for date manipulation.
    • Use for building internationalized applications that require locale-specific date and time formatting on demand.
    • Use for extending date-time functionality with plugins to add advanced formatting and custom features in modern JavaScript environments.

    Should you depend on it?

    License terms, project hygiene and risks, from GitHub metadata and GStars' snapshots.

    License

    MIT

    Permissive: commercial use, modification and redistribution are allowed with attribution.

    Community files

    • README: present
    • Contributing guide: present

    Watch-outs

    No watch-outs from GStars' checks.

    General guidance from repository metadata, not legal advice. How we score

    From the README

    Fast 2kB alternative to Moment.js with the same modern API

    Day.js is a minimalist JavaScript library that parses, validates, manipulates, and displays dates and times for modern browsers with a largely Moment.js-compatible API. If you use Moment.js, you already know how to use Day.js.

    You can find more details, API, and other docs on day.js.org website.

    Excerpt from the iamkun/dayjs README on GitHub (MIT license). © its authors.Read the full README on GitHub

    Daily snapshots

    Stars gained per day, and how forks and open issues moved, from GStars' daily snapshots

    Aug 15: -4Aug 16: +3

    -8 stars over 79 days across 8 snapshot days; best day +3 on Aug 16.

    Forks

    4.4K+1.9K

    Open issues

    1.5K+161

    Compared with peers in API

    Fastest-growing repositories GStars tracks in this cohort for the week of Nov 8, by 7-day star growth

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