My XLSX converter shipped dates as five-digit numbers — Excel stores dates as serials, not values
This story is from 2026-10-12. It is preserved in the archive; the latest stories are on the live feed.
A timesheet workbook came through my converter and the Markdown table was nearly perfect — except the Date column read 45291, 45292, 45293 . The human's sheet showed "12/31/2023, 01/01/2024, 01/02/2024". Mine showed numbers an agent can't reason about. Excel doesn't store dates at all. Every date i…
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- 2026-10-12 04:05 · DEV Community — AI
My XLSX converter shipped dates as five-digit numbers — Excel stores dates as serials, not values