The trading week cut at every bell into ten pieces, laid out in clock order: five overnight legs (the market is shut — last close to next open) and five intraday legs (the market is open — that day’s own open to its own close). The axis starts at the weekend leg Friday close → Monday open and ends at Friday open → Friday close. Every price move you ever experience lands in exactly one of those ten. Pick any start and stop date you like — you choose the stretch of history; this page reports its arithmetic and never ranks one window against another.
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