Time zones

All 27 zones of slave 10 are below. Each zone takes eight registers and shows the date, time, weekday and UTC offset for its zone. Zones 0-14 cover zero and positive offsets, 15-26 negative ones; the exact offset sits in each card header. The server computes the time on read, so it is always current and the cards update on their own.

Unix timestamp

IR 300..301 (server)

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System time

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Drift

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IR 300..301 carry the Unix timestamp (uint32 ABCD, 0.5 s accuracy). Drift is the difference between the server timestamp and the browser system time.