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Conversietools

Day of Year Converter

Convert dates to year-and-ordinal-day notation or restore dates from ordinal days.

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Uses YYYY-DDD with 001-based days and Gregorian leap-year rules. Invalid day 366 values are rejected.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Hoe werkt het

  1. Convert dates to year-and-ordinal-day notation or restore dates from ordinal days.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Voorbeeld

2024-12-31 ⇄ 2024-366

Details en beperkingen

Text stays in your browser; it is not sent to a conversion server.

Referenties

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