ISO weekday number

Client

ISO weekday numbers feed cron and business-day rules—Monday is 1.

About ISO weekday number

Monday=1 … Sunday=7 per ISO-8601. 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.

2

Nearby workflows on Toolcore

  • 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.
  • Weekday name from date — Return English weekday for an ISO date. when the same instant should appear as epoch, zone, or cron.
  • Business days calculator — Count weekdays (Mon–Fri) between two calendar dates—inclusive, computed in your browser. 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

  • ISO weekday 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.