Updated catalog DTOs

catalog/dto/product.go

@@ -13,8 +13,8 @@ type GetProductResponseDTO struct {
 	Name      string    `json:"name"`
 	Slug      string    `json:"slug"`
 	Price     float64   `json:"price"`
-	CreatedAt time.Duration `json:"created_at"`
+	CreatedAt time.Time `json:"created_at"`
-	UpdatedAt time.Duration `json:"updated_at,omitempty"`
+	UpdatedAt time.Time `json:"updated_at,omitempty"`
 }
 
 type GetProductListRequestDTO struct {