diff --git a/ui-ngx/src/app/core/api/entity-data-subscription.ts b/ui-ngx/src/app/core/api/entity-data-subscription.ts
index 274e896df5..9c769f3777 100644
--- a/ui-ngx/src/app/core/api/entity-data-subscription.ts
+++ b/ui-ngx/src/app/core/api/entity-data-subscription.ts
@@ -799,7 +799,7 @@ export class EntityDataSubscription {
     } else {
       prevSeries = [0, 0];
     }
-    for (let time = startTime; time < endTime && (this.timer || this.history); time += this.frequency) {
+    for (let time = startTime; time <= endTime && (this.timer || this.history); time += this.frequency) {
       const value = dataKey.func(time, prevSeries[1]);
       const series: [number, any] = [time, value];
       data.push(series);