Day of year

Client

Julian day-of-year for astronomy and finance.

About Day of year

Ordinal day (1–366) 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

  • Julian day number — Convert ISO calendar date to Julian day number (JD at noon UTC). 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.
  • Schedule tools — Unix epoch and ISO conversion, ISO-8601 duration parse/build, cron expression parsing, and multi time zone comparison—index of time utili… when the same instant should appear as epoch, zone, or cron.
  • ISO-8601 duration — Parse P…/PT… into labeled parts and plain English, or build normalized duration strings—local only. 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.