Date Formatter
Standardise every date in a column to one format.
Mixed date formats are the most common reason a spreadsheet breaks downstream. Parse whatever your column contains — text, serials, DMY, MDY, ISO — and rewrite it all into one consistent, genuinely typed date format.
- Rating
- 4.9(2.2K)
- Monthly uses
- 297K
- Price
- Free
or drag it here
.xlsx, .xls, .csv · processed locally, never uploaded
Files stay on your device
What it does well
- Parses 30+ input patterns including month names and serial numbers
- Explicit DMY/MDY disambiguation so nothing is silently mis-parsed
- Writes real Excel date values, not text that merely looks like a date
How to use Date Formatter
- 1
Upload the file and pick the date column.
- 2
Confirm how ambiguous dates like 03/04/2025 should be read.
- 3
Choose the output format from the presets or write a custom pattern.
- 4
Apply and download.
Watch a walkthrough
Common problems and fixes
Dates still left-align after conversion.
Left alignment means they are still text. Enable “Write as date value” rather than the text-only formatting mode.
Some rows convert and others do not.
The unconverted rows use a different pattern. The report lists them with their raw value — add a second pass with the matching input pattern.
Frequently asked questions
What people say
Fast, no signup wall, no watermark. I have sent the Date Formatter link to half my department.
Exactly what I needed. Date Formatter used to be a twenty-minute job with a macro I did not trust; now it takes one drag and one click.
Our IT team blocked every other online tool because they upload files. This one does not, so date formatter finally got approved for use on real data.
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