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DATES TOOL

Day of Year Calculator

Calculate the 1-based day number within a Gregorian year.

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  1. 01

    Add your input

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  2. 02

    Make it yours

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  3. 03

    Take the result

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Ordinal date calculator online

Find a date's one-based position within its year. The day number depends on the calendar year and leap-year status.

How to use it

Enter Calendar date or select Try example. Review the displayed input. Select Run tool and inspect the result before copying or downloading.

Worked examples

Find a date's one-based position within its year.

Worked example — Day of Year Calculator

Settings: No additional options

Input:

2026-10-12

Output:

Day of year: 285

Limitations and common mistakes

  • The day number depends on the calendar year and leap-year status.

Frequently asked questions

How can I locate the day number of a year online?

Enter Calendar date or select Try example. Review the displayed input. Select Run tool and inspect the result before copying or downloading.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.

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