Fix #2966: convert formula result to Date when numFmt is date-like#76
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Fix #2966: convert formula result to Date when numFmt is date-like#76senoff wants to merge 1 commit into
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…#2966) When a formula cell's cached result is a numeric Excel date serial, the reader now materialises `cell.value.result` as a JS Date, even when an off-spec writer has marked the cell as t="str" and put a numeric serial inside <v>. This matches the behaviour for non-formula date cells. Uses Number() instead of parseFloat() for string coercion so that partial strings like "2026-05-07" are not silently truncated to 2026. Guards the excelToDate call behind typeof === 'number' so non-numeric results (empty string, "N/A", booleans) are passed through unchanged. Both the non-streaming reconcile path (cell-xform.js) and the streaming worksheet reader (worksheet-reader.js) are fixed. Adds 4-case integration test that covers: - numeric <v> with no t attribute (regression baseline) - numeric <v> with t="str" (the actual bug) - non-numeric display string with t="str" (must not become Invalid Date) - streaming reader: numeric serial with t="str" becomes a Date
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Summary
Tracked at exceljs#2966.
When a cell holds a formula whose cached result is a numeric Excel date serial and the cell's
numFmtis date-like (m/d/yyyy, etc.), the reader should materialisecell.value.resultas a JSDate. It did for the plain case (<v>46143</v>, notattribute), but not when an off-spec writer marked the formula cell witht="str"and still put a numeric serial inside<v>. The streamingWorkbookReaderhad the same gap and never applied date conversion to formula results at all.Fix
lib/xlsx/xform/sheet/cell-xform.js(reconcile, Formula branch) andlib/stream/xlsx/worksheet-reader.js(formula cell handling) both now:numFmtis date-like (utils.isDateFmt).resultis a string, tryNumber(trimmed)— stricter thanparseFloatso partial strings like"2026-05-07"are rejected (returnNaN), not silently coerced to2026.utils.excelToDatewhen the result is actually anumber. Non-numeric values ("","N/A", booleans) pass through unchanged.Files changed
lib/xlsx/xform/sheet/cell-xform.js— add string→number coercion +typeof === 'number'guard beforeexcelToDate(Formula reconcile branch)lib/stream/xlsx/worksheet-reader.js— same coercion + guard in the formula cell handlerspec/integration/issues/issue-2966-formula-result-date-numfmt.spec.js— 4-case integration test using JSZip-injected fixture shapesTest cases
<v>, not(regression baseline)Date<v>witht="str"(the actual bug)Datet="str"t="str"DateNotes
--no-verifyon commits due to the existing prettier↔eslint hook conflict (unrelated to this change). See PR Fix prettier↔eslint config drift on comma-dangle functions #69 for the config fix.fix-2943) touchescell-xform.jsat theparseCloseformula branch (~line 348); this PR touches thereconcileFormula branch (~line 457) — no conflict.