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Four Silent XLSX Export Bugs Found in a Jira Forge Invoice App

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A development team building a resource management app on Atlassian Forge discovered four data-integrity bugs during a focused QA review of their XLSX invoice export feature. None of the bugs triggered errors or visibly corrupted the spreadsheet, making them especially difficult to detect. One bug caused date-only fields to silently carry phantom time components, producing day-off errors for users in certain time zones. Another bug stored numeric values — such as hours and costs — as text strings, causing Excel functions like SUM to return zero despite the figures appearing correct. The team resolved the issues by writing integer Excel serial numbers for dates and explicitly casting numeric columns to number types at the point of file generation.

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