diff --git a/x-pack/plugin/sql/qa/src/main/resources/datetime.csv-spec b/x-pack/plugin/sql/qa/src/main/resources/datetime.csv-spec
index 50df0f7dfe67e..8f46788fd0891 100644
--- a/x-pack/plugin/sql/qa/src/main/resources/datetime.csv-spec
+++ b/x-pack/plugin/sql/qa/src/main/resources/datetime.csv-spec
@@ -381,3 +381,11 @@ Bezalel
 Bojan  
 
 ;
+
+// datetime in aggregations
+doubleCastOfDateInAggs
+SELECT CAST (CAST (birth_date AS VARCHAR) AS TIMESTAMP) a FROM test_emp WHERE YEAR(birth_date) = 1965 GROUP BY a;
+    a:ts
+---------------
+1965-01-03T00:00:00Z
+;
\ No newline at end of file
diff --git a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/querydsl/agg/GroupByKey.java b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/querydsl/agg/GroupByKey.java
index 6f26ee1dd960c..9638a1bd305d2 100644
--- a/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/querydsl/agg/GroupByKey.java
+++ b/x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/querydsl/agg/GroupByKey.java
@@ -42,7 +42,7 @@ public final CompositeValuesSourceBuilder<?> asValueSource() {
             } else if (script.outputType() == DataType.DATE) {
                 builder.valueType(ValueType.LONG);
             } else if (script.outputType() == DataType.DATETIME) {
-                builder.valueType(ValueType.DATE);
+                builder.valueType(ValueType.LONG);
             } else if (script.outputType() == DataType.BOOLEAN) {
                 builder.valueType(ValueType.BOOLEAN);
             } else if (script.outputType() == DataType.IP) {
diff --git a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/planner/QueryFolderTests.java b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/planner/QueryFolderTests.java
index 17b1eedf06d93..6e538bb0e7a5d 100644
--- a/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/planner/QueryFolderTests.java
+++ b/x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/planner/QueryFolderTests.java
@@ -302,7 +302,7 @@ public void testGroupKeyTypes_DateTime() {
                 "\"source\":\"InternalSqlScriptUtils.add(InternalSqlScriptUtils.docValue(doc,params.v0)," +
                 "InternalSqlScriptUtils.intervalYearMonth(params.v1,params.v2))\",\"lang\":\"painless\",\"params\":{" +
                 "\"v0\":\"date\",\"v1\":\"P1Y2M\",\"v2\":\"INTERVAL_YEAR_TO_MONTH\"}},\"missing_bucket\":true," +
-                "\"value_type\":\"date\",\"order\":\"asc\"}}}]}}}"));
+                "\"value_type\":\"long\",\"order\":\"asc\"}}}]}}}"));
         assertEquals(2, ee.output().size());
         assertThat(ee.output().get(0).toString(), startsWith("count(*){a->"));
         assertThat(ee.output().get(1).toString(), startsWith("a{s->"));