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node_modules/date-fns/getISOWeek.js

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+import { millisecondsInWeek } from "./constants.js";
+import { startOfISOWeek } from "./startOfISOWeek.js";
+import { startOfISOWeekYear } from "./startOfISOWeekYear.js";
+import { toDate } from "./toDate.js";
+
+/**
+ * The {@link getISOWeek} function options.
+ */
+
+/**
+ * @name getISOWeek
+ * @category ISO Week Helpers
+ * @summary Get the ISO week of the given date.
+ *
+ * @description
+ * Get the ISO week of the given date.
+ *
+ * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
+ *
+ * @param date - The given date
+ * @param options - The options
+ *
+ * @returns The ISO week
+ *
+ * @example
+ * // Which week of the ISO-week numbering year is 2 January 2005?
+ * const result = getISOWeek(new Date(2005, 0, 2))
+ * //=> 53
+ */
+export function getISOWeek(date, options) {
+  const _date = toDate(date, options?.in);
+  const diff = +startOfISOWeek(_date) - +startOfISOWeekYear(_date);
+
+  // Round the number of weeks to the nearest integer because the number of
+  // milliseconds in a week is not constant (e.g. it's different in the week of
+  // the daylight saving time clock shift).
+  return Math.round(diff / millisecondsInWeek) + 1;
+}
+
+// Fallback for modularized imports:
+export default getISOWeek;