ISO week date
ClientISO week-year, week number, and weekday (1=Mon … 7=Sun).
Show ISO-8601 year-week-day for a calendar date.
About ISO week date
Show ISO-8601 year-week-day 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.
2026-W35-4
Common use cases
- ISO week date 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.
ISO week number
ClientISO 8601 week number and Monday–Sunday bounds for any calendar date—local browser calculation.
Unix timestamp converter
ClientEpoch to date: seconds, milliseconds, ISO-8601, UTC and local time—in browser.
Weekdays between dates
ClientCount Mon–Fri days between two ISO dates inclusive—local schedule math.
Cron expression helper
ClientHuman-readable schedule, next run times—standard 5-field cron in your browser.