Dealing with wrongly entered dates in CSV files can be a real headache, especially when Excel automatically auto-corrects them into the wrong format (like misinterpreting days as years). Using complex formulas like LEFT, MID, or RIGHT often leads to unpredictable results. Crucially, if Excel auto-formats your dates incorrectly, never save the file as a CSV or Excel sheet—doing so permanently corrupts the entries into unrecoverable serial numbers. In this tutorial, we cover the exact step-by-step process to safely open, recover, and fix scrambled date formats before any data is permanently lost.
We demonstrate two zero-formula methods to quickly resolve this issue. First, we use Power Query by removing Excel’s automatic “Change Type” step and leveraging Change Type with Locale to map the original data’s region (such as matching United Kingdom’s Day/Month/Year standard). Second, we show a quick system-wide fix by temporarily adjusting your Windows Control Panel Region settings before opening the file. Both techniques ensure your dates load accurately as long dates (e.g., May 2, 2026) so you can clean, save, and export your files effortlessly.
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