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@renovate renovate bot commented Aug 13, 2025

This PR contains the following updates:

Package Change Age Confidence
date-fns ^3.0.0 -> ^4.0.0 age confidence

Release Notes

date-fns/date-fns (date-fns)

v4.1.0

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This release adds time zone support to format functions (that I somehow missed when working on the feature) and fixes a few bugs.

Make sure also upgrade TZDate to v1.0.2 as it includes a bunch of critical bug fixes.

Fixed
  • Fixed internal constructFrom throwing an exception on null arguments. While null isn't allowed, the functions should rather return Invalid Date or NaN in such cases. See #​3885.
Added
  • Added missing time zone support to format, formatISO, formatISO9075, formatRelative and formatRFC3339. See #​3886.

v4.0.0

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I have great news! First, ten years after its release, date-fns finally gets first-class time zone support.

Another great news is that there aren't many breaking changes in this release. All of them are type-related and will affect only those explicitly using internal date-fns types. Finally, it has been less than a year since the last major release, which is an improvement over the previous four years between v2 and v3. I plan on keeping the pace and minimizing breaking changes moving forward.

Read more about the release in the announcement blog post.

- Sasha @​kossnocorp

Added
  • Added time zones support via @date-fns/tz's TZDate class and tz helper function. See its README for the details about the API.

  • All relevant functions now accept the context in option, which allows to specify the time zone to make the calculations in. If the function also returns a date, it will be in the specified time zone:

    import { addDays, startOfDay } from "date-fns";
    import { tz } from "@​date-fns/tz";
    
    startOfDay(addDays(Date.now(), 5, { in: tz("Asia/Singapore") }));
    //=> "2024-09-16T00:00:00.000+08:00"

    In the example, addDays will get the current date and time in Singapore and add 5 days to it. startOfDay will inherit the date type and return the start of the day in Singapore.

Changed
  • The function arguments, as well as Interval's start and end, now can be of different types, allowing you to mix UTCDate, TZDate, Date, and other extensions, as well as primitives (strings and numbers).

    The functions will normalize these values, make calculations, and return the result in the same type, preventing any bugs caused by the discrepancy. If passed, the type will be inferred from the context in option or the first encountered argument object type. The Interval's start and end will be considered separately, starting from start.

    In the given example, the result will be in the TZDate as the first argument is a number, and the start takes precedence over the end.

    clamp(Date.now(), {
      start: new TZDate(start, "Asia/Singapore"),
      end: new UTCDate(),
    });
    //=> TZDate
  • BREAKING: This release contains a bunch of types changes that should not affect the library's expected usage. The changes are primarily internal and nuanced, so rather than listing them here, I recommend you running the type checker after the upgrade. If there are unfixable problems, please open an issue.

  • BREAKING: The package now is ESM-first. The CommonJS is still support and It should not affect most users, but it might break in certains environments. If you encounter any issues, please report them.

Fixed
  • Fixed CDN build compatibility with jQuery and other tools that expose $ by properly wrapping the code in an IIFE.

Configuration

📅 Schedule: Branch creation - "before 7am" in timezone Europe/Madrid, Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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@renovate renovate bot enabled auto-merge (squash) August 13, 2025 22:31
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relativeci bot commented Aug 13, 2025

#309 Bundle Size — 1.28MiB (+0.02%).

e2bf70e(current) vs cc3847f master#308(baseline)

Warning

Bundle contains 3 duplicate packages – View duplicate packages

Bundle metrics  Change 2 changes
                 Current
#309
     Baseline
#308
No change  Initial JS 591.31KiB 591.31KiB
No change  Initial CSS 539.71KiB 539.71KiB
Change  Cache Invalidation 52.39% 0%
No change  Chunks 8 8
No change  Assets 10 10
Change  Modules 1710(+0.12%) 1708
No change  Duplicate Modules 4 4
No change  Duplicate Code 0.04% 0.04%
No change  Packages 119 119
No change  Duplicate Packages 3 3
Bundle size by type  Change 1 change Regression 1 regression
                 Current
#309
     Baseline
#308
Regression  JS 763.83KiB (+0.03%) 763.58KiB
No change  CSS 539.86KiB 539.86KiB
No change  IMG 2.7KiB 2.7KiB
No change  HTML 294B 294B

Bundle analysis reportBranch renovate-date-fns-4.xProject dashboard


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@renovate renovate bot merged commit 76a5810 into master Aug 13, 2025
3 checks passed
@renovate renovate bot deleted the renovate-date-fns-4.x branch August 13, 2025 22:32
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