diff --git a/chrono/datetime.h b/chrono/datetime.h
index 1d98bc8..fef2713 100644
--- a/chrono/datetime.h
+++ b/chrono/datetime.h
@@ -486,4 +486,14 @@ inline DateTime &DateTime::operator -=(const TimeSpan &timeSpan)
 
 }
 
+namespace std {
+template<> struct hash<ChronoUtilities::DateTime>
+{
+    inline size_t operator()(const ChronoUtilities::DateTime &dateTime) const
+    {
+        return hash<decltype (dateTime.totalTicks())>()(dateTime.totalTicks());
+    }
+};
+}
+
 #endif // CHRONO_UTILITIES_DATETIME_H
diff --git a/chrono/timespan.h b/chrono/timespan.h
index 109bee7..ae2fc1a 100644
--- a/chrono/timespan.h
+++ b/chrono/timespan.h
@@ -363,4 +363,14 @@ constexpr inline bool TimeSpan::isInfinity() const
 
 }
 
+namespace std {
+template<> struct hash<ChronoUtilities::TimeSpan>
+{
+    inline size_t operator()(const ChronoUtilities::TimeSpan &timeSpan) const
+    {
+        return hash<decltype (timeSpan.totalTicks())>()(timeSpan.totalTicks());
+    }
+};
+}
+
 #endif // CHRONO_UTILITIES_TIMESPAN_H
diff --git a/tests/chronotests.cpp b/tests/chronotests.cpp
index c7c3726..761a115 100644
--- a/tests/chronotests.cpp
+++ b/tests/chronotests.cpp
@@ -24,6 +24,7 @@ class ChronoTests : public TestFixture
     CPPUNIT_TEST(testDateTime);
     CPPUNIT_TEST(testTimeSpan);
     CPPUNIT_TEST(testOperators);
+    CPPUNIT_TEST(testHashing);
     CPPUNIT_TEST_SUITE_END();
 
 public:
@@ -33,6 +34,7 @@ public:
     void testDateTime();
     void testTimeSpan();
     void testOperators();
+    void testHashing();
 };
 
 CPPUNIT_TEST_SUITE_REGISTRATION(ChronoTests);
@@ -116,3 +118,21 @@ void ChronoTests::testOperators()
     CPPUNIT_ASSERT_EQUAL(5, dateTime.day());
     CPPUNIT_ASSERT_EQUAL(2, Period(dateTime, dateTime + TimeSpan::fromDays(62)).months());
 }
+
+/*!
+ * \brief Tests hashing DateTime / TimeSpan by using in a set.
+ */
+void ChronoTests::testHashing()
+{
+    set<DateTime> dateTimes;
+    dateTimes.emplace(DateTime::fromDate(2500, 2, 1));
+    dateTimes.emplace(DateTime::fromDate(2500, 2, 2));
+    dateTimes.emplace(DateTime::fromDate(2500, 2, 1));
+    CPPUNIT_ASSERT_EQUAL(2ul, dateTimes.size());
+
+    set<TimeSpan> timeSpans;
+    timeSpans.emplace(TimeSpan::fromDays(5));
+    timeSpans.emplace(TimeSpan::fromDays(10));
+    timeSpans.emplace(TimeSpan::fromDays(5));
+    CPPUNIT_ASSERT_EQUAL(2ul, timeSpans.size());
+}