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fix(xlsx): read filled-down formulas, formula errors and times as shown - #1781

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@L4XB L4XB commented Sep 25, 2026 •

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Related GitHub Issue

Closes: #1780

Description

formatCellValue in src/integrations/misc/extract-text-from-xlsx.ts now:

  • Reads a formula's result like a plain value. The check also matches sharedFormula, which is how ExcelJS reads the cells of a formula filled down or across ({ sharedFormula: "A1", result: 4 }). The result then goes through the same branches as a plain cell, so an error result reads [Error: #DIV/0!] and a date result is formatted like a date cell. A formula without a result still reads [Formula: …], now from cell.formula, which also gives the translated text of a shared formula (B3*2).
  • Formats dates by the cell's number format (formatDate). ExcelJS returns a UTC Date for any number with a date or time format. If the format shows a day or a year (checked outside quoted text and [...] sections, case-insensitively), the cell reads as an ISO date, plus HH:MM:SS when the value has a time of day. Otherwise it is a time of day (06:00:00), or, with [h], [m] or [s], an elapsed duration in total hours (36:00:00). Durations are counted from the workbook's day 0: 1899-12-30, or 1904-01-01 when date1904 is set. The value is rounded to the second first, as Excel shows it.

Choices a reviewer may want to look at:

  • ExcelJS has no number formatter, so a time of day is written as HH:MM:SS (h:mm AM/PM reads in 24-hour form), and an elapsed duration counts in the unit of its bracket: [h] as H:MM:SS, [m] as total minutes ([mm]:ss of 25 h 30 s reads 1500:30), [s] as total seconds. A format with a month but no hour or second (mmm) counts as a date, and escaped characters are skipped like quoted text (review round 2).
  • The time of a date-time comes from the value, so a timestamp formatted to show only the date now reads with its time. That matches the existing choice to print dates in ISO form rather than as displayed.
  • A Date cell with no number format (as in the existing "should format dates correctly" test) reads as before.

Test Procedure

  • cd src && npx vitest run integrations/misc/__tests__/extract-text-from-xlsx.test.ts: 19 passed. The four new tests fail on main with the output from the issue ([object Object], 1899-12-30, date without time, 1904-01-02). They cover:
    • a filled-down formula, including a shared cell without a result;
    • a formula error and a formula date;
    • date-times, an upper-case format, formats with a year but no day (mmm yyyy) and a day but no year (d-mmm), times of day, Excel's system time format [$-x-systime]h:mm:ss AM/PM, a month-only format, a quoted unit and an escaped one, and [h], [mm] and [ss] durations;
    • a cached 0 or false formula result, which ExcelJS leaves out of cell.value (review round 2);
    • a duration in a 1904 workbook.
  • npx vitest run integrations/misc core/tools: 37 files, 798 passed.
  • npx tsc --noEmit and npx eslint --max-warnings=0 on both files are clean. The pre-commit pnpm lint and pre-push check-types hooks passed.
  • I read the workbook from the issue (built the way Excel saves those cells: a shared formula, an error cell, a date formula, h:mm, [h]:mm:ss and a date-time) through extractTextFromXLSX with TZ set to Europe/Berlin, America/New_York and UTC. Every run gives:
2	1	[Error: #DIV/0!]	2024-10-30	06:00:00	36:00:00	2024-09-30 14:05:00
4	2
6	3
  • Each of 17 single-line mutants of the new code (for example shared formulas ignored, quoted text or [...] not stripped, no rounding, the 1904 epoch ignored, durations read as clock time) makes at least one test fail.

Pre-Submission Checklist

  • Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
  • Scope: My changes are focused on the linked issue (one major feature/fix per PR).
  • Self-Review: I have performed a thorough self-review of my code.
  • Testing: New and/or updated tests have been added to cover my changes (if applicable).
  • Visual Snapshot (UI changes only): N/A, no UI change.
  • Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
  • Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

  • No documentation updates are required.

Additional Notes

No changeset or CHANGELOG entry, per AGENTS.md.

ExcelJS reads the cells of a formula filled down or across as
{ sharedFormula, result }, which the "formula" in value check missed, so
they read as [object Object]. A formula result also went through
toString(), so an error result read as [object Object] and a date result
as a local-time JS date string. Every Date was cut to its ISO date, so a
date-time lost its time and a time of day or a duration read as
1899-12-30 or 1899-12-31.

Read a formula's result like a plain value (cell.formula gives the text
of a shared formula without one). Keep the time of a date-time, and read
a cell whose number format shows no day or year as a time of day, or as
an elapsed duration for [h], [m] and [s], counted from the workbook's
day 0.

Fixes Zoo-Code-Org#1780
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📝 Summary

Summary by CodeRabbit

  • Bug Fixes
    • Improved spreadsheet text extraction for calculated formulas, including shared formulas and results containing errors or dates.
    • Date and time values are now formatted according to their cell formats, with date-time values retaining both date and time details.
    • Duration values are now extracted correctly, including from workbooks using the 1904 date system.

The XLSX text extractor now reads calculated results from shared formulas and formats dates, times, and durations according to cell number formats and the workbook’s date system.

Changes: XLSX extraction

Layer / File(s) Summary
Date and time formatting
src/integrations/misc/extract-text-from-xlsx.ts, src/integrations/misc/__tests__/extract-text-from-xlsx.test.ts
Date values are rounded to seconds. Date, time-of-day, and elapsed-duration values use formatting based on the cell number format. Elapsed durations account for the workbook’s 1900 or 1904 date system. Tests cover date/time formats and a 1904-system duration.
Formula result extraction
src/integrations/misc/extract-text-from-xlsx.ts, src/integrations/misc/__tests__/extract-text-from-xlsx.test.ts
Formula cells use calculated results, including shared formulas. Formula results that are errors or dates are formatted as values. Tests cover shared formulas, cached 0 and false results, and formula error/date results.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: 🔵 Low · up to 9ec4f

Some extracted durations contain a seconds field absent from the spreadsheet’s display. This is a bounded formatting error, so the change is mergeable with a targeted correction or accepted follow-up.

### Architecture Summary

Architecture risk: 🟡 Medium · up to 9ec4f

The change affects 1 system.

Changed systems: src

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

  • observed — src (service) was modified; 2 changed files map to changed impact.

Before / after behavior

  • observed — Modified behavior in src/integrations/misc/tests/extract-text-from-xlsx.test.ts: Added a test expecting each cell in a filled-down shared-formula column to produce its cached result or, when absent, a translated formula.
  • observed — Modified behavior in src/integrations/misc/tests/extract-text-from-xlsx.test.ts: Added a test expecting cached 0 and false results from ordinary and shared formulas to be extracted rather than formula text.
  • observed — Modified behavior in src/integrations/misc/tests/extract-text-from-xlsx.test.ts: Added a test expecting formula results containing an error or a date to be extracted in the same formatted form as plain values.
  • observed — Modified behavior in src/integrations/misc/tests/extract-text-from-xlsx.test.ts: Added cases asserting formatted output for dates, times of day, and durations, including elapsed-hour, elapsed-minute, and elapsed-second formats.

Reliability and maintainability

  • inferred — Risk-relevant change factors for src: blast_radius_1; direct_dependents_1
Pre-merge checks | Passed 7 | Failed 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Regression Evidence Warning The tests do not cover one explicit date-format behavior introduced by this PR. formatDate emits the time whenever a date has a non-midnight time (lines 20–21), even when the number format shows onl… Add a focused extractor test with a non-midnight Date and a date-only numFmt such as yyyy-mm-dd. Assert the intended output includes both the ISO date and time, for example 2024-09-30 14:05:00.
✅ Passed checks (7 passed)
Check name Status Explanation
Linked Issues check Passed The changes meet the coding requirements in [#1780]. formatCellValue reads normal and shared formula results, including cached 0 and false, and formats formula errors. formatDate uses the cell…
Out of Scope Changes check Passed The production changes and tests in the whole-PR diff directly address formula extraction and date/time formatting in [#1780]. No unrelated changes appear in the diff.
Security Boundaries Passed No changed path meets the security failure conditions. The diff changes XLSX cell formatting: it reads cached formula results and formats dates and durations. It does not execute formula text or use c…
Persistence Integrity Passed No changed persistence path exists. The diff changes XLSX cell formatting and adds extraction tests. extractTextFromXLSX reads the workbook at lines 84–88 and returns extracted text at lines 91–125;…
Lifecycle Resource Cleanup Passed No changed lifecycle path exists. The diff adds date and formula formatting in formatDate and formatCellValue (lines 12–78) and tests. The XLSX extraction loop only reads values and builds text. I…
Title check Passed The title clearly summarizes the main XLSX changes: shared formulas, formula errors, and time formatting.
Description check Passed The description includes the linked issue, implementation details, test procedures, extensive test results, checklist status, and documentation impact.
Full details: Regression Evidence

Explanation

The tests do not cover one explicit date-format behavior introduced by this PR. formatDate emits the time whenever a date has a non-midnight time (lines 20–21), even when the number format shows only a date. The added tests cover a timestamp with a time-bearing format (line 224) and date-only formats only at midnight (lines 226–227, 234). A regression that drops the time for a non-midnight value with a date-only format would pass these tests.

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const time = Math.round(date.getTime() / 1000) * 1000
const iso = new Date(time).toISOString()
const numFmt = cell.numFmt ?? ""
if (!numFmt || /[dy]/i.test(numFmt.replace(/"[^"]*"|\[[^\]]*\]/g, ""))) {

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Can we classify month-only formats such as mmm as calendar dates so they do not become 00:00:00?

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Yes, in 9ec4fa1. A format with a month and no hour or second beside it (mmm, mmmm) now counts as a date, so it reads as the ISO date instead of 00:00:00. The elapsed check runs first, because once its brackets are stripped [h]:mm leaves only :mm, which the month rule would otherwise take for a date. The dates test has an mmmm cell for it.

const time = Math.round(date.getTime() / 1000) * 1000
const iso = new Date(time).toISOString()
const numFmt = cell.numFmt ?? ""
if (!numFmt || /[dy]/i.test(numFmt.replace(/"[^"]*"|\[[^\]]*\]/g, ""))) {

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Would stripping backslash-escaped literals prevent h:mm \d from being misclassified as a calendar date?

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Yes. Escaped characters are now skipped like quoted text and [...] sections, so h:mm\ \d\a\i\l\y stays a time (18:00:00) instead of becoming a date on day 0. That case is in the times test, and dropping the \\. alternative from the regex makes it fail.

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A correction to my reply above, found while porting this to another reader. ExcelJS unescapes number-format codes when it loads a file: a workbook saved with h:mm\ \d\a\i\l\y arrives as h:mm daily, so the backslashes are gone before formatDate sees the code. Skipping escapes therefore helps only workbooks built in memory, as the test does and as extractTextFromXLSX(workbook) allows. For a file, a backslash-escaped d/y in a time format still reads as a date. Quoted text such as h:mm" daily" survives loading and is handled. The same goes for a format that is only an elapsed bracket ([ss], [h]): ExcelJS does not treat it as a date format, so such a cell from a file stays a number. I kept both branches because they are correct for in-memory workbooks, and I can drop them if you prefer.

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In `@src/integrations/misc/extract-text-from-xlsx.ts`:
- Line 25: Update the elapsed-time formatter to select its leading unit from the
bracketed token in numFmt, so [mm]:ss emits total elapsed minutes rather than
hours; update the corresponding test assertion to expect 1500:00 for a 25-hour
value.
- Line 37: In the formula-result handling branch, read the cached result from
`cell.result` rather than `value.result`, then use that result for the nullish
check and extracted value. Add regression cases confirming cached `0` and
`false` are returned for both normal and shared formulas.

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…, and falsy formula results

A format with a month but no hour or second beside it (mmm, mmmm) shows
a date, so it no longer reads as 00:00:00. Escaped characters are skipped
like quoted text, so h:mm\ \d\a\i\l\y stays a time. The elapsed check now
runs before the date rule, which would otherwise read [h]:mm as a month.

Elapsed time counts in the unit of its bracket: [mm]:ss of 25 hours and
30 seconds reads 1500:30, and [ss] reads total seconds.

A formula's cached result is read from cell.result. ExcelJS leaves a
cached 0 or false out of cell.value, so such a cell read as its formula.
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Review comments at @src/integrations/misc/extract-text-from-xlsx.ts:
- Around line 26-37: Update the elapsed-hour formatting branch to include
seconds only when the cell’s format requests them, so `[h]:mm` renders hours and
minutes without a seconds field. Update the 1904-workbook expectation to reflect
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Nice! Thanks for this fix, had one edge case which we should address please.

Comment on lines +49 to +53
if (typeof value === "object" && ("formula" in value || "sharedFormula" in value)) {
const result = cell.result
if (result === undefined || result === null) {
return `[Formula: ${cell.formula}]`
}

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For a cell inside a merged range, ExcelJS returns the master's value object, so "formula" in value is true. But cell.result and cell.formula look undefined on a merged cell. Would this print [Formula: undefined] for the non-master cells of a merged formula? main read value.result there. Reading from cell.master when cell.type === ExcelJS.ValueType.Merge might cover it, plus a merged-cell test.

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Good catch, it did. The new test reproduces it on the previous commit: every cell of a merged formula but the first printed [Formula: undefined]. Fixed in 3799c56. formatCellValue now reads a merged range through cell.master when cell.type === ExcelJS.ValueType.Merge, so each cell of the range shows the top-left result, as main did through value.result. The test covers merged formulas with a number, a cached 0 and a date result.

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The other cells of a merged range return the top-left cell's value
object, but cell.result and cell.formula are undefined on them, so a
merged formula printed [Formula: undefined] in every cell but the
first. Read the range through cell.master, as main did through
value.result.

Elapsed durations now show seconds only when the format has them:
[h]:mm of 36 hours reads 36:00, as Excel shows it.
@github-actions github-actions Bot removed the awaiting-author PR is waiting for the author to address requested changes label Oct 17, 2026
L4XB added 2 commits October 17, 2026 16:56
Main made extractTextFromXLSX take only a Buffer (Zoo-Code-Org#2002) and moved the
workbook tests to formatWorkbook. The tests this branch adds still passed
a Workbook to extractTextFromXLSX, which no longer type-checks.
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[BUG] read_file shows [object Object] for filled-down xlsx formulas and loses times

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