diff --git a/src/app/api/span-annotations/route.ts b/src/app/api/span-annotations/route.ts
index b39fee4..df0c1b3 100644
--- a/src/app/api/span-annotations/route.ts
+++ b/src/app/api/span-annotations/route.ts
@@ -65,8 +65,8 @@ export async function POST(request: NextRequest) {
       .insert(spanAnnotations)
       .values({
         chart_id,
-        start_time: actualStartTime,
-        end_time: actualEndTime,
+        start_time: new Date(actualStartTime * 1000),
+        end_time: new Date(actualEndTime * 1000),
         label,
         confidence: confidence || null,
         outcome: outcome || null,