The classic ASP site prints a week number under the site title, and people
quote it in conversation and on paperwork. Anyone with both sites open needs
the two to agree, so this is a port of the old arithmetic rather than a fresh
interpretation of what a fiscal week is: ISO 8601, week 1 contains 4 January,
and the week's Thursday decides which year it belongs to. That rule is what
makes late December and early January land in the right year, which is exactly
where a naive day-of-year count goes wrong, so it is what the tests cover.
Worth recording: a true GE fiscal calendar need not follow ISO weeks. Nobody
has asked for a different rule, and inventing one here would silently disagree
with the site people compare against.
Computed in local time on purpose. The number people quote is the one on the
wall where they stand, and a UTC week rolls over hours early in the evening at
a US site. The sidebar re-checks every half hour; the shop-floor board picks it
up with the clock it already ticks.
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