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diff --git a/date-fns/src/setMonth/index.ts b/date-fns/src/setMonth/index.ts
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+import toInteger from '../_lib/toInteger/index'
+import toDate from '../toDate/index'
+import getDaysInMonth from '../getDaysInMonth/index'
+import requiredArgs from '../_lib/requiredArgs/index'
+
+/**
+ * @name setMonth
+ * @category Month Helpers
+ * @summary Set the month to the given date.
+ *
+ * @description
+ * Set 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} month - the month of the new date
+ * @returns {Date} the new date with the month set
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Set February to 1 September 2014:
+ * const result = setMonth(new Date(2014, 8, 1), 1)
+ * //=> Sat Feb 01 2014 00:00:00
+ */
+export default function setMonth(dirtyDate: Date | number, dirtyMonth: number): Date {
+  requiredArgs(2, arguments)
+
+  const date = toDate(dirtyDate)
+  const month = toInteger(dirtyMonth)
+  const year = date.getFullYear()
+  const day = date.getDate()
+
+  const dateWithDesiredMonth = new Date(0)
+  dateWithDesiredMonth.setFullYear(year, month, 15)
+  dateWithDesiredMonth.setHours(0, 0, 0, 0)
+  const daysInMonth = getDaysInMonth(dateWithDesiredMonth)
+  // Set the last day of the new month
+  // if the original date was the last day of the longer month
+  date.setMonth(month, Math.min(day, daysInMonth))
+  return date
+}