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CSV Date Format Converter
Convert selected CSV dates between explicit numeric layouts with real calendar validation.
Pasted CSV, One UTF-8 CSV file
converted-dates.csv, date-conversion-report.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the admitted input and explicit options described below.
- Select Convert date layout and inspect the stated conventions.
- Download the complete result and any companion report.
Examples
2026-10-19 in YYYY-MM-DD becomes 19/10/2026 in DD/MM/YYYY.
Limitations
- At most 1 MiB UTF-8 input, 10000 data rows, 100 columns and 100000 cells including headers; 20 MiB combined output and 30 seconds.
- Only exact YYYY-MM-DD, YYYY/MM/DD, DD/MM/YYYY andMM/DD/YYYY layouts, years 0001–9999. No date guessing, timezone, epoch or timestamp conversion.
- Empty and invalid-date behavior is explicit. Spreadsheet formula protection is on by default; formula-sensitive unselected cells can acquire an apostrophe.
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