Convert Date to Percentage

Convert Date to Percentage lets you figure out how far a specific date is through the year. Whether you’re checking how much of the year has passed or planning by day-of-year, this tool gives you the exact percentage instantly.

Paste your input above or import a file below.
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Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
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How to Use:

  1. Type or paste one or more dates into the left box, using YYYY-MM-DD format.
  2. Each line should have a single date – it processes them all at once.
  3. The percentage of the year completed for each date appears on the right automatically.
  4. Use Copy Output or Export to File to save the results.
  5. Hit Clear All to reset the tool completely.
  6. You can also import dates from a .txt or .csv file using the Choose File button.

What Convert Date to Percentage can do:

  • Calculates how far along a given date is in its calendar year.
  • Accepts multi-line inputs and provides individual percentage results for each date.
  • Validates input and skips or marks invalid dates like 2025-13-40.
  • Gives precise percentage with two decimal points, even for leap years.
  • Auto-updates and highlights the output area when results change.

Example:

2025-01-01
2025-03-15
2025-06-30
2025-12-31

Returns:

2025-01-01 = 0.00%
2025-03-15 = 20.27%
2025-06-30 = 49.59%
2025-12-31 = 99.73%

Common Use Cases:

Trying to track how much of the year has gone by? This tool is perfect for progress reports, day-of-year planning, seasonal analysis, or just general curiosity. With Convert Date to Percentage, you get accurate, formatted insights at a glance.

Useful Tools & Suggestions:

If you’re measuring time progress, Convert Time to Percentage works the same way but for hours and minutes. And to figure out exactly where a date sits, Find Day of the Year gives you the number you need to calculate it.

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