Back to Free Tools
FREE TOOLS
Ordinal Date Converter
Convert calendar and ordinal dates in both directions, including full year endpoints.
YYYY-MM-DD, YYYY-DDD
ordinal-date.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 using Direction, Calendar or ordinal date.
- Use the explicit mode and declared finite options. Only selected operation fields participate.
- Select Convert ordinal date and download ordinal-date.json.
Examples
2024-02-29 is2024-060, with306 days remaining after that date in the leap year.
Limitations
- Years0001–9999; exact padded calendar or ordinal grammar,64 KiB report and30-second processing limit.
- Days remaining excludes the chosen date. No timezone, fiscal calendar or holiday conversion. Existing ISO week output already supplies day-of-year information; this tool adds reverse ordinal conversion.
Related tools
No items found.