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node_modules/date-fns/differenceInCalendarWeeks.mjs

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+import { millisecondsInWeek } from "./constants.mjs";
+import { startOfWeek } from "./startOfWeek.mjs";
+import { getTimezoneOffsetInMilliseconds } from "./_lib/getTimezoneOffsetInMilliseconds.mjs";
+
+/**
+ * The {@link differenceInCalendarWeeks} function options.
+ */
+
+/**
+ * @name differenceInCalendarWeeks
+ * @category Week Helpers
+ * @summary Get the number of calendar weeks between the given dates.
+ *
+ * @description
+ * Get the number of calendar weeks between the given dates.
+ *
+ * @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
+ *
+ * @param dateLeft - The later date
+ * @param dateRight - The earlier date
+ * @param options - An object with options.
+ *
+ * @returns The number of calendar weeks
+ *
+ * @example
+ * // How many calendar weeks are between 5 July 2014 and 20 July 2014?
+ * const result = differenceInCalendarWeeks(
+ *   new Date(2014, 6, 20),
+ *   new Date(2014, 6, 5)
+ * )
+ * //=> 3
+ *
+ * @example
+ * // If the week starts on Monday,
+ * // how many calendar weeks are between 5 July 2014 and 20 July 2014?
+ * const result = differenceInCalendarWeeks(
+ *   new Date(2014, 6, 20),
+ *   new Date(2014, 6, 5),
+ *   { weekStartsOn: 1 }
+ * )
+ * //=> 2
+ */
+export function differenceInCalendarWeeks(dateLeft, dateRight, options) {
+  const startOfWeekLeft = startOfWeek(dateLeft, options);
+  const startOfWeekRight = startOfWeek(dateRight, options);
+
+  const timestampLeft =
+    +startOfWeekLeft - getTimezoneOffsetInMilliseconds(startOfWeekLeft);
+  const timestampRight =
+    +startOfWeekRight - getTimezoneOffsetInMilliseconds(startOfWeekRight);
+
+  // Round the number of days to the nearest integer because the number of
+  // milliseconds in a days is not constant (e.g. it's different in the week of
+  // the daylight saving time clock shift).
+  return Math.round((timestampLeft - timestampRight) / millisecondsInWeek);
+}
+
+// Fallback for modularized imports:
+export default differenceInCalendarWeeks;