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node_modules/date-fns/differenceInMonths.js

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+import { normalizeDates } from "./_lib/normalizeDates.js";
+import { compareAsc } from "./compareAsc.js";
+import { differenceInCalendarMonths } from "./differenceInCalendarMonths.js";
+import { isLastDayOfMonth } from "./isLastDayOfMonth.js";
+
+/**
+ * The {@link differenceInMonths} function options.
+ */
+
+/**
+ * @name differenceInMonths
+ * @category Month Helpers
+ * @summary Get the number of full months between the given dates.
+ *
+ * @param laterDate - The later date
+ * @param earlierDate - The earlier date
+ * @param options - An object with options
+ *
+ * @returns The number of full months
+ *
+ * @example
+ * // How many full months are between 31 January 2014 and 1 September 2014?
+ * const result = differenceInMonths(new Date(2014, 8, 1), new Date(2014, 0, 31))
+ * //=> 7
+ */
+export function differenceInMonths(laterDate, earlierDate, options) {
+  const [laterDate_, workingLaterDate, earlierDate_] = normalizeDates(
+    options?.in,
+    laterDate,
+    laterDate,
+    earlierDate,
+  );
+
+  const sign = compareAsc(workingLaterDate, earlierDate_);
+  const difference = Math.abs(
+    differenceInCalendarMonths(workingLaterDate, earlierDate_),
+  );
+
+  if (difference < 1) return 0;
+
+  if (workingLaterDate.getMonth() === 1 && workingLaterDate.getDate() > 27)
+    workingLaterDate.setDate(30);
+
+  workingLaterDate.setMonth(workingLaterDate.getMonth() - sign * difference);
+
+  let isLastMonthNotFull = compareAsc(workingLaterDate, earlierDate_) === -sign;
+
+  if (
+    isLastDayOfMonth(laterDate_) &&
+    difference === 1 &&
+    compareAsc(laterDate_, earlierDate_) === 1
+  ) {
+    isLastMonthNotFull = false;
+  }
+
+  const result = sign * (difference - +isLastMonthNotFull);
+  return result === 0 ? 0 : result;
+}
+
+// Fallback for modularized imports:
+export default differenceInMonths;