统一时间格式和时区

backend/internal/pkg/response/response_test.go

@@ -0,0 +1,54 @@
+package response
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+)
+
+func TestNormalizeTimeUsesSecondPrecisionCST(t *testing.T) {
+	value := time.Date(2026, 7, 30, 9, 53, 58, 147355000, time.UTC)
+	got := NormalizeTime(map[string]interface{}{
+		"created_at": value,
+		"nested": []interface{}{
+			&value,
+			json.RawMessage(`{"kept":true}`),
+		},
+	})
+
+	raw, err := json.Marshal(got)
+	if err != nil {
+		t.Fatalf("marshal normalized response: %v", err)
+	}
+	text := string(raw)
+	if !json.Valid(raw) {
+		t.Fatalf("normalized response should stay valid json: %s", text)
+	}
+	if text != `{"created_at":"2026-07-30T17:53:58+08:00","nested":["2026-07-30T17:53:58+08:00",{"kept":true}]}` {
+		t.Fatalf("unexpected normalized response: %s", text)
+	}
+}
+
+func TestNormalizeTimeStructKeepsJSONTags(t *testing.T) {
+	type sample struct {
+		CreatedAt time.Time  `json:"created_at"`
+		Optional  string     `json:"optional,omitempty"`
+		Hidden    string     `json:"-"`
+		DeletedAt *time.Time `json:"deleted_at,omitempty"`
+	}
+
+	value := time.Date(2026, 7, 30, 9, 53, 58, 147355000, time.UTC)
+	got := NormalizeTime(sample{
+		CreatedAt: value,
+		Hidden:    "secret",
+	})
+
+	raw, err := json.Marshal(got)
+	if err != nil {
+		t.Fatalf("marshal normalized struct: %v", err)
+	}
+	text := string(raw)
+	if text != `{"created_at":"2026-07-30T17:53:58+08:00"}` {
+		t.Fatalf("unexpected normalized struct: %s", text)
+	}
+}