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fix(rollup): compute ISO week from UTC calendar fields #411

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fix(rollup): compute ISO week from UTC calendar fields #411

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7 changes: 5 additions & 2 deletions src/rollup.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -51,8 +51,11 @@ function readWeeklyDigest(date: string): string | null {

/** Format a date as ISO week string, e.g. "2026-W10". */
function toWeekStr(date: Date): string {
// ISO week: week containing the first Thursday of the year
const d = new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()));
// ISO week: week containing the first Thursday of the year.
// Read the calendar date via UTC getters: callers pass a CST timestamp whose
// UTC fields hold the intended CST date, so local getters would shift the day
// (and thus the week/year) whenever the process runs outside UTC.
const d = new Date(Date.UTC(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate()));
d.setUTCDate(d.getUTCDate() + 4 - (d.getUTCDay() || 7));
const yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
const week = Math.ceil(((d.getTime() - yearStart.getTime()) / 86400000 + 1) / 7);
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