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node_modules/date-fns/differenceInCalendarWeeks.cjs

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+"use strict";
+exports.differenceInCalendarWeeks = differenceInCalendarWeeks;
+var _index = require("./_lib/getTimezoneOffsetInMilliseconds.cjs");
+var _index2 = require("./_lib/normalizeDates.cjs");
+var _index3 = require("./constants.cjs");
+var _index4 = require("./startOfWeek.cjs");
+
+/**
+ * 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.
+ *
+ * @param laterDate - The later date
+ * @param earlierDate - 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
+ */
+function differenceInCalendarWeeks(laterDate, earlierDate, options) {
+  const [laterDate_, earlierDate_] = (0, _index2.normalizeDates)(
+    options?.in,
+    laterDate,
+    earlierDate,
+  );
+
+  const laterStartOfWeek = (0, _index4.startOfWeek)(laterDate_, options);
+  const earlierStartOfWeek = (0, _index4.startOfWeek)(earlierDate_, options);
+
+  const laterTimestamp =
+    +laterStartOfWeek -
+    (0, _index.getTimezoneOffsetInMilliseconds)(laterStartOfWeek);
+  const earlierTimestamp =
+    +earlierStartOfWeek -
+    (0, _index.getTimezoneOffsetInMilliseconds)(earlierStartOfWeek);
+
+  return Math.round(
+    (laterTimestamp - earlierTimestamp) / _index3.millisecondsInWeek,
+  );
+}