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diff --git a/date-fns/src/isSameQuarter/index.ts b/date-fns/src/isSameQuarter/index.ts
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+import startOfQuarter from '../startOfQuarter/index'
+import requiredArgs from '../_lib/requiredArgs/index'
+
+/**
+ * @name isSameQuarter
+ * @category Quarter Helpers
+ * @summary Are the given dates in the same year quarter?
+ *
+ * @description
+ * Are the given dates in the same year quarter?
+ *
+ * ### 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} dateLeft - the first date to check
+ * @param {Date|Number} dateRight - the second date to check
+ * @returns {Boolean} the dates are in the same quarter
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Are 1 January 2014 and 8 March 2014 in the same quarter?
+ * var result = isSameQuarter(new Date(2014, 0, 1), new Date(2014, 2, 8))
+ * //=> true
+ */
+export default function isSameQuarter(dirtyDateLeft: Date | number, dirtyDateRight: Date | number): boolean {
+  requiredArgs(2, arguments)
+
+  const dateLeftStartOfQuarter = startOfQuarter(dirtyDateLeft)
+  const dateRightStartOfQuarter = startOfQuarter(dirtyDateRight)
+
+  return dateLeftStartOfQuarter.getTime() === dateRightStartOfQuarter.getTime()
+}