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diff --git a/date-fns/src/setDate/index.ts b/date-fns/src/setDate/index.ts
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+++ b/date-fns/src/setDate/index.ts
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+import toInteger from '../_lib/toInteger/index'
+import toDate from '../toDate/index'
+import requiredArgs from '../_lib/requiredArgs/index'
+
+/**
+ * @name setDate
+ * @category Day Helpers
+ * @summary Set the day of the month to the given date.
+ *
+ * @description
+ * Set the day of the month to the given date.
+ *
+ * ### v2.0.0 breaking changes:
+ *
+ * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
+ *
+ * @param {Date|Number} date - the date to be changed
+ * @param {Number} dayOfMonth - the day of the month of the new date
+ * @returns {Date} the new date with the day of the month set
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Set the 30th day of the month to 1 September 2014:
+ * var result = setDate(new Date(2014, 8, 1), 30)
+ * //=> Tue Sep 30 2014 00:00:00
+ */
+export default function setDate(dirtyDate: Date | number, dirtyDayOfMonth: number): Date {
+  requiredArgs(2, arguments)
+
+  const date = toDate(dirtyDate)
+  const dayOfMonth = toInteger(dirtyDayOfMonth)
+  date.setDate(dayOfMonth)
+  return date
+}