diff --git a/application/src/main/java/org/thingsboard/server/service/cf/ctx/state/aggregation/single/EntityAggregationCalculatedFieldState.java b/application/src/main/java/org/thingsboard/server/service/cf/ctx/state/aggregation/single/EntityAggregationCalculatedFieldState.java
index 721e93c6fc..a1877638e9 100644
--- a/application/src/main/java/org/thingsboard/server/service/cf/ctx/state/aggregation/single/EntityAggregationCalculatedFieldState.java
+++ b/application/src/main/java/org/thingsboard/server/service/cf/ctx/state/aggregation/single/EntityAggregationCalculatedFieldState.java
@@ -288,7 +288,7 @@ public class EntityAggregationCalculatedFieldState extends BaseCalculatedFieldSt
             }
             if (!metricsNode.isEmpty()) {
                 ObjectNode resultNode = JacksonUtil.newObjectNode();
-                resultNode.put("ts", interval.getEndTs() - 1);
+                resultNode.put("ts", interval.getStartTs());
                 resultNode.set("values", metricsNode);
                 result.add(resultNode);