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What's the difference?

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All stages · Demo 120

ISO week

Choice ISO vs US weeks. `setUTCDate(+4 - (day||7))` owns the number. US Sunday-start is a hatch, not a guess.

ChoiceISO-8601 week in Date

A giant W39. 2026-09-21 is week 39 because Thursday said so.

replaycal —wk —

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STANDBY

All 4056 stages

Educational stage on jev.page — not the official TypeSafe console. Live calls go to POST https://api.typesafe.ai/v1/systemone from your browser when you paste a key. Without a key, the stage plays a recorded decision shaped like jev-1.13.0. Jev does not write the UI copy.