Julian day number

Client

Astronomical Julian date for noon UTC on the given civil day.

About Julian day number

Convert ISO calendar date to Julian day number (JD at noon UTC). 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.

JD 2461279.50000

Nearby workflows on Toolcore

  • 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.
  • ISO week number — ISO 8601 week number and Monday–Sunday bounds for any calendar date—local browser calculation. when the same instant should appear as epoch, zone, or cron.
  • Weekdays between dates — Count Mon–Fri days between two ISO dates inclusive—local schedule math. when the same instant should appear as epoch, zone, or cron.
  • Cron expression helper — Human-readable schedule, next run times—standard 5-field cron in your browser. when the same instant should appear as epoch, zone, or cron.

Common use cases

  • Julian day number 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.