How to convert hundreds of text dates to real excel dates without datevalue()
- Step 1Upload the file with text-stored dates — Drop the .xlsx or .csv with the mixed-format date column.
- Step 2Run the standardizer — Every parseable text date is converted to ISO 8601 (or your chosen format) in one pass.
- Step 3Download the converted file — True date values are stored in every converted cell. No DATEVALUE() formulas needed.
Frequently asked questions
What formats does DATEVALUE() fail on that this tool handles?+
'12 January 2024', '12-Jan-24', '2024/01/12', and most non-US formats cause DATEVALUE() to error. chrono-node handles all of these.
Does the output use Excel serial date numbers or formatted date strings?+
The output writes date values as ISO 8601 strings. SheetJS stores them in the cell with a date number format so Excel displays them correctly.
Can I target only specific date columns?+
Currently all columns are scanned. Column-specific mode is on the roadmap.
Privacy first
Every JAD Excel tool runs entirely in your browser using SheetJS and ExcelJS. Your spreadsheets, formulas, and data never leave your device — verified by zero outbound network requests during processing.