diff --git a/src/opm/parser/eclipse/EclipseState/Schedule/SummaryState.cpp b/src/opm/parser/eclipse/EclipseState/Schedule/SummaryState.cpp
index 179c9d271..697410b0d 100644
--- a/src/opm/parser/eclipse/EclipseState/Schedule/SummaryState.cpp
+++ b/src/opm/parser/eclipse/EclipseState/Schedule/SummaryState.cpp
@@ -19,6 +19,7 @@
 
 #include <unordered_map>
 #include <cstring>
+#include <ctime>
 #include <iostream>
 #include <iomanip>
 
@@ -55,11 +56,22 @@ namespace {
     SummaryState::SummaryState(std::chrono::system_clock::time_point sim_start_arg):
         sim_start(sim_start_arg)
     {
+        this->update_elapsed(0);
     }
 
 
     void SummaryState::update_elapsed(double delta) {
         this->elapsed += delta;
+        std::time_t sim_time = std::chrono::system_clock::to_time_t( this->sim_start + std::chrono::microseconds(static_cast<std::size_t>(1000000*delta)));
+        struct tm ts;
+        gmtime_r(&sim_time, &ts);
+        int year = ts.tm_year + 1900;
+        int month = ts.tm_mon;
+        int day = ts.tm_mday;
+
+        this->update("YEAR", year);
+        this->update("MNTH", month);
+        this->update("DAY", day);
     }
 
 
diff --git a/tests/test_Summary.cpp b/tests/test_Summary.cpp
index ac8fb40c4..adc074bd1 100644
--- a/tests/test_Summary.cpp
+++ b/tests/test_Summary.cpp
@@ -27,6 +27,7 @@
 #include <exception>
 #include <stdexcept>
 #include <unordered_map>
+#include <ctime>
 
 #include <ert/ecl/ecl_sum.h>
 #include <ert/ecl/smspec_node.h>
@@ -1550,7 +1551,7 @@ BOOST_AUTO_TEST_CASE(Test_SummaryState) {
     BOOST_CHECK_EQUAL(std::count(all_wells.begin(), all_wells.end(), "OP2"), 1);
     BOOST_CHECK_EQUAL(std::count(all_wells.begin(), all_wells.end(), "OP3"), 1);
 
-    BOOST_CHECK_EQUAL(st.size(), 8);
+    BOOST_CHECK_EQUAL(st.size(), 11); // Size = 8 + 3 - where the the three are DAY, MNTH and YEAR
 
     // The well 'OP_2' which was indirectly added with the
     // st.update("WWCT:OP_2", 100) call is *not* counted as a well!
@@ -3201,4 +3202,30 @@ BOOST_AUTO_TEST_CASE(serialize_sumary_state) {
 
 }
 
+
+BOOST_AUTO_TEST_CASE(SummaryState__TIME) {
+    struct tm ts;
+    ts.tm_year = 100;
+    ts.tm_mon = 1;
+    ts.tm_mday = 1;
+    ts.tm_hour = 0;
+    ts.tm_min = 0;
+    ts.tm_sec = 0;
+    auto start_time = timegm(&ts);
+    SummaryState st(std::chrono::system_clock::from_time_t(start_time));
+    BOOST_CHECK_EQUAL(st.get("YEAR"), 2000);
+    BOOST_CHECK_EQUAL(st.get("DAY"), 1);
+    BOOST_CHECK_EQUAL(st.get("MNTH"), 1);
+
+    // Next day
+    st.update_elapsed(100000);
+    BOOST_CHECK_EQUAL(st.get("YEAR"), 2000);
+    BOOST_CHECK_EQUAL(st.get("DAY"), 2);
+    BOOST_CHECK_EQUAL(st.get("MNTH"), 1);
+
+    // Well into 2001
+    st.update_elapsed(400 * 86400);
+    BOOST_CHECK_EQUAL(st.get("YEAR"), 2001);
+}
+
 BOOST_AUTO_TEST_SUITE_END()