diff --git a/src/app/api/admin/children/route.ts b/src/app/api/admin/children/route.ts
index 39f3fa8..32534da 100644
--- a/src/app/api/admin/children/route.ts
+++ b/src/app/api/admin/children/route.ts
@@ -26,7 +26,7 @@ export async function GET(request: Request) {
       children: children.map((c: any) => ({
         id: c.id,
         name: c.name,
-        birthDate: c.birth_date?.toISOString(),
+        birthDate: c.birth_date ? new Date(c.birth_date).toISOString() : null,
         familyId: c.family_id,
         familyName: c.family_name,
         age: c.age || "N/A",
diff --git a/src/app/api/admin/families/route.ts b/src/app/api/admin/families/route.ts
index c76221f..e15518c 100644
--- a/src/app/api/admin/families/route.ts
+++ b/src/app/api/admin/families/route.ts
@@ -33,7 +33,7 @@ export async function GET(request: Request) {
         tier: f.tier || "free",
         maxChildren: f.max_children || 1,
         maxMembers: f.max_members || 2,
-        createdAt: f.created_at?.toISOString(),
+        createdAt: f.created_at ? new Date(f.created_at).toISOString() : null,
         userCount: Number(f.user_count) || 0,
         childCount: Number(f.child_count) || 0,
       })),
diff --git a/src/app/api/admin/users/route.ts b/src/app/api/admin/users/route.ts
index 1de14a1..3df4376 100644
--- a/src/app/api/admin/users/route.ts
+++ b/src/app/api/admin/users/route.ts
@@ -30,7 +30,7 @@ export async function GET(request: Request) {
         name: u.name,
         familyId: u.family_id,
         familyName: u.family_name,
-        createdAt: u.created_at?.toISOString(),
+        createdAt: u.created_at ? new Date(u.created_at).toISOString() : null,
       })),
     });
   } catch (error) {