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diff --git a/search-data-service-app/src/main/java/org/onap/aai/sa/searchdbabstraction/searchapi/DateHistogramAggregation.java b/search-data-service-app/src/main/java/org/onap/aai/sa/searchdbabstraction/searchapi/DateHistogramAggregation.java
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+/**
+ * ============LICENSE_START=======================================================
+ * org.onap.aai
+ * ================================================================================
+ * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * Copyright © 2017-2018 Amdocs
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.aai.sa.searchdbabstraction.searchapi;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+/**
+ * An example of elasticsearch date_histogram aggregation:
+ *
+ * <p>
+ * 
+ * <pre>
+ * {
+ *    "aggs": {
+ *        "my_group": {
+ *            "date_histogram" : {
+ *               "field" : "date",
+ *               "interval" : "month"
+ *           }
+ *        }
+ *    }
+ * }
+ * </pre>
+ */
+
+public class DateHistogramAggregation extends AbstractAggregation {
+
+    private String interval;
+
+    private String format;
+
+    @JsonProperty("time-zone")
+    private String timeZone;
+
+
+    public String getInterval() {
+        return interval;
+    }
+
+    public void setInterval(String interval) {
+        this.interval = interval;
+    }
+
+    public String getTimeZone() {
+        return timeZone;
+    }
+
+    public String getFormat() {
+        return format;
+    }
+
+    public void setFormat(String format) {
+        this.format = format;
+    }
+
+    public void setTimeZone(String timeZone) {
+        this.timeZone = timeZone;
+    }
+
+    @Override
+    public String toElasticSearch() {
+        StringBuilder sb = new StringBuilder();
+
+        sb.append("\"date_histogram\": {\"field\": \"");
+        sb.append(field);
+        sb.append("\"");
+        if (interval != null) {
+            sb.append(", \"interval\": \"");
+            sb.append(interval);
+            sb.append("\"");
+        }
+        if (format != null) {
+            sb.append(", \"format\": \"");
+            sb.append(format);
+            sb.append("\"");
+        }
+        if (timeZone != null) {
+            sb.append(", \"time_zone\": \"");
+            sb.append(timeZone);
+            sb.append("\"");
+        }
+        if (size != null) {
+            sb.append(", \"size\": ");
+            sb.append(size);
+        }
+        if (minThreshold != null) {
+            sb.append(", \"min_doc_count\": ").append(minThreshold);
+        }
+        sb.append("}");
+
+        return sb.toString();
+    }
+
+    @Override
+    public String toString() {
+        return "DateHistogramAggregation: [field=" + field + ", interval=" + interval + ", format=" + format
+                + ", timeZone=" + timeZone + ", size=" + size + " minThreshold=" + minThreshold;
+    }
+}