What this tool does
Standardize mixed transaction dates into YYYY-MM-DD, MM/DD/YYYY or DD/MM/YYYY without changing other columns. It creates a separate CSV download and does not modify the source file.
- Detect common date formats
- Choose the output format
- Keep unrecognized values visible
- Preserve all other fields
How to use it
- Select a supported file.
- Map or choose columns when the tool asks for them.
- Convert the file and inspect the preview.
- Download the CSV only after checking the results.
Privacy: The selected financial file is not included in account, payment or advertising requests.
Questions about CSV Date Format Fixer
Which dates are recognized?
The parser handles common ISO, slash, dash and compact date patterns. Ambiguous numeric dates are interpreted day-first by default.
What happens to invalid dates?
They remain unchanged and are counted as invalid so you can locate them in the output.
Does the tool change times?
It focuses on the calendar date and does not preserve time-of-day values.