Day of year

Client

Convert dates for analytics or astronomy.

About Day of year

Ordinal day number for a calendar date. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

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Nearby workflows on Toolcore

  • Day of year — Ordinal day number (1–366) for a date. when the same instant should appear as epoch, zone, or cron.
  • Ordinal date calculator — Day-of-year number for YYYY-MM-DD. when the same instant should appear as epoch, zone, or cron.
  • Unix timestamp converter — Epoch to date: seconds, milliseconds, ISO-8601, UTC and local time—in browser. when the same instant should appear as epoch, zone, or cron.
  • Julian date — Julian day number for a calendar date. when the same instant should appear as epoch, zone, or cron.

Common use cases

  • Day of year for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.