diff --git a/packages/services/evolution-service/src/analytics/application/services/statistics-aggregation.service.ts b/packages/services/evolution-service/src/analytics/application/services/statistics-aggregation.service.ts
index 868524e..eb15c25 100644
--- a/packages/services/evolution-service/src/analytics/application/services/statistics-aggregation.service.ts
+++ b/packages/services/evolution-service/src/analytics/application/services/statistics-aggregation.service.ts
@@ -133,7 +133,9 @@ export class StatisticsAggregationService {
     const result: Record<string, TrendDataPoint[]> = {};
     for (const metric of params.metrics) {
       result[metric] = filtered.map(s => ({
-        date: s.statDate.toISOString().split('T')[0],
+        date: s.statDate instanceof Date
+          ? s.statDate.toISOString().split('T')[0]
+          : String(s.statDate).split('T')[0],
         // eslint-disable-next-line @typescript-eslint/no-explicit-any
         value: Number((s as any)[metric] || 0),
       }));
@@ -373,8 +375,13 @@ export class StatisticsAggregationService {
   }
 
   private toDto(orm: DailyStatisticsORM): DailyStatisticsDto {
+    // Handle statDate being either Date or string
+    const statDateStr = orm.statDate instanceof Date
+      ? orm.statDate.toISOString().split('T')[0]
+      : String(orm.statDate).split('T')[0];
+
     return {
-      statDate: orm.statDate.toISOString().split('T')[0],
+      statDate: statDateStr,
       dimension: orm.dimension,
       dimensionValue: orm.dimensionValue,
       newUsers: Number(orm.newUsers),