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fix: parse negative ten-digit timestamps as seconds - #71
Parse negative ten-digit Unix seconds correctly while retaining all inputs already recognized as seconds.
The documented seconds example timestamp(1385091596) produces a date with getTime() === 1385091596000. Its negative counterpart currently produces -1385091596, treating the same magnitude as milliseconds because the minus sign increases String(v).length to 11. The same happens for string input.
This keeps the existing ten-character condition and adds recognition of negative integers whose magnitude has ten characters. In particular, it deliberately preserves the legacy behavior of negative nine-digit seconds such as -138509159; replacing the condition with an absolute-value length check alone would regress that currently working input. The integer condition applies only to the new branch, preserving existing positive and negative fractional-input behavior too.
No changes are made to no-argument/zero behavior, shorter positive timestamps, rounding, formatting, dependencies, or build configuration.
Regression coverage
Add an eleven-case table in the existing timestamp() suite, covering negative ten-digit seconds as numbers/strings, positive ten-digit seconds, positive/negative thirteen-digit milliseconds, legacy negative nine-digit seconds as numbers/strings, and positive/negative fractional inputs as numbers/strings. Against the original source, only the two negative ten-digit-second cases fail; all eleven pass with this change.
The initial revision's fractional-input regression identified in the automated review was independently reproduced: -12345.6789 and its string equivalent must retain the original -12345 ms result. The new fractional controls fail against the initial revision, and pass after adding the integer guard only to the new negative branch. Existing positive fractional behavior remains unchanged.
Local validation
Node 24.19.0, using the project's declared toolchain in an isolated worktree containing exactly these two changed files:
npm run prepublishOnly: passes (TypeScript 5.9.3, ESM/CJS and declaration builds).
npm run test-local -- test/date.test.ts: 27 passing, versus 26 on clean HEAD (egg-bin 6.13.0).
oxlint@1.11.1 src test, the manifest's declared minimum version: passes on both original and patched source.
git diff --check: passes.
There are also existing toolchain failures; I have not hidden or fixed them as part of this patch:
Fresh installation currently resolves the declared ^1.11.1 lint range to oxlint 1.90.0. Default lint reports 206 diagnostics on both clean HEAD and the patched tree, with the same filename/rule/message/severity multiset.
The declared attw --pack command exits 3 with Cannot read properties of undefined (reading 'filename') on both clean HEAD and this patch in the same environment.
The full test suite, supported Node/OS matrix, and remote CI have not been run. This is not a claim that all checks pass.
Investigation, implementation, and tests were AI-assisted; no independent human review is claimed.
Summary by CodeRabbit
Bug Fixes
Negative 10-digit timestamps are now interpreted as seconds, matching the existing behavior for positive values. Negative 13-digit timestamps continue to be interpreted as milliseconds, while shorter negative values retain their existing unit inference.
Tests
Added coverage for negative numeric and string timestamp inputs across these supported timestamp lengths.
No actionable comments were generated in the recent review.
Recent review info
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Files selected for processing: 2
src/date.ts
test/date.test.ts
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test/date.test.ts
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Walkthrough
timestamp() now interprets negative values with a ten-digit absolute representation as seconds. Tests cover negative numeric and string inputs, positive and millisecond values, and fractional inputs.
Changes: Timestamp unit inference
Layer / File(s)
Summary
Negative timestamp conversion and tests src/date.ts, test/date.test.ts
timestamp() converts negative ten-digit values from seconds to milliseconds. Tests check negative numeric and string values, thirteen-digit millisecond values, shorter negative values, and fractional inputs.
The timestamp change is narrowly scoped and preserves existing fractional behavior while covering negative ten-digit seconds. No merge-blocking risk is identified.
Pre-merge checks: 5
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The title clearly and concisely describes the main change: parsing negative ten-digit timestamps as seconds.
Docstring Coverage
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
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Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 1 functions across 2 files.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/date.ts:
- Line 169: Restrict the 10-character timestamp branch in timestamp to integer
values by adding a Number.isInteger(v) condition. Preserve the existing
fractional-millisecond behavior, including for negative inputs.
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src/date.ts
test/date.test.ts
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Addressed the fractional-input finding in c4cc710. I independently reproduced the regression for both -12345.6789 and its string equivalent: the original result was -12345 ms, whereas the initial patch produced -12345678 ms.
Only the new negative branch now requires Number.isInteger(v); the original length-based branch stays unchanged. Added positive/negative fractional controls as both numbers and strings, bringing the regression table to 11 cases while preserving the legacy negative-nine-digit seconds behavior.
Rebuilt ESM/CJS/declarations and reran the official date suite: 27 passing. Manifest-minimum oxlint 1.11.1 passes; default oxlint still has the same 206 baseline diagnostics, and attw has the same baseline internal error. This is not full CI approval.
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Summary
Parse negative ten-digit Unix seconds correctly while retaining all inputs already recognized as seconds.
The documented seconds example
timestamp(1385091596)produces a date withgetTime() === 1385091596000. Its negative counterpart currently produces-1385091596, treating the same magnitude as milliseconds because the minus sign increasesString(v).lengthto 11. The same happens for string input.This keeps the existing ten-character condition and adds recognition of negative integers whose magnitude has ten characters. In particular, it deliberately preserves the legacy behavior of negative nine-digit seconds such as
-138509159; replacing the condition with an absolute-value length check alone would regress that currently working input. The integer condition applies only to the new branch, preserving existing positive and negative fractional-input behavior too.No changes are made to no-argument/zero behavior, shorter positive timestamps, rounding, formatting, dependencies, or build configuration.
Regression coverage
Add an eleven-case table in the existing
timestamp()suite, covering negative ten-digit seconds as numbers/strings, positive ten-digit seconds, positive/negative thirteen-digit milliseconds, legacy negative nine-digit seconds as numbers/strings, and positive/negative fractional inputs as numbers/strings. Against the original source, only the two negative ten-digit-second cases fail; all eleven pass with this change.The initial revision's fractional-input regression identified in the automated review was independently reproduced:
-12345.6789and its string equivalent must retain the original-12345ms result. The new fractional controls fail against the initial revision, and pass after adding the integer guard only to the new negative branch. Existing positive fractional behavior remains unchanged.Local validation
Node 24.19.0, using the project's declared toolchain in an isolated worktree containing exactly these two changed files:
npm run prepublishOnly: passes (TypeScript 5.9.3, ESM/CJS and declaration builds).npm run test-local -- test/date.test.ts: 27 passing, versus 26 on clean HEAD (egg-bin 6.13.0).oxlint@1.11.1 src test, the manifest's declared minimum version: passes on both original and patched source.git diff --check: passes.There are also existing toolchain failures; I have not hidden or fixed them as part of this patch:
^1.11.1lint range to oxlint 1.90.0. Default lint reports 206 diagnostics on both clean HEAD and the patched tree, with the same filename/rule/message/severity multiset.attw --packcommand exits 3 withCannot read properties of undefined (reading 'filename')on both clean HEAD and this patch in the same environment.The full test suite, supported Node/OS matrix, and remote CI have not been run. This is not a claim that all checks pass.
Investigation, implementation, and tests were AI-assisted; no independent human review is claimed.
Summary by CodeRabbit