统一时间格式和时区

backend/internal/service/callback.go

@@ -17,6 +17,7 @@ import (
 	"time"
 
 	"affiliate_dash/internal/model"
+	"affiliate_dash/internal/pkg/timeutil"
 
 	"github.com/google/uuid"
 	"gorm.io/gorm"
@@ -140,7 +141,7 @@ func (s *CallbackService) Enqueue(tx *gorm.DB, merchantID uint, event string, da
 		payload, err := json.Marshal(map[string]interface{}{
 			"event_id":    eventID,
 			"event":       event,
-			"occurred_at": now.UTC().Format(time.RFC3339Nano),
+			"occurred_at": timeutil.FormatAPITime(now),
 			"data":        data,
 		})
 		if err != nil {

backend/internal/service/delivery.go

@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"affiliate_dash/internal/model"
+	"affiliate_dash/internal/pkg/timeutil"
 
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
@@ -349,7 +350,7 @@ func (s *DeliveryService) claimDeliverySubmission(merchantID, apiClientID uint,
 		}
 		raw, _ := json.Marshal(map[string]interface{}{
 			"source":               "delivery_proxy",
-			"submit_started_at":    time.Now().UTC().Format(time.RFC3339),
+			"submit_started_at":    timeutil.FormatAPITime(time.Now()),
 			"provider_order_stage": "claimed",
 		})
 		if err := tx.Model(&order).Updates(map[string]interface{}{

backend/internal/service/fulfillment.go

@@ -10,6 +10,7 @@ import (
 	"unicode/utf8"
 
 	"affiliate_dash/internal/model"
+	"affiliate_dash/internal/pkg/timeutil"
 
 	"github.com/google/uuid"
 	"gorm.io/gorm"
@@ -599,11 +600,11 @@ func (s *FulfillmentService) ListWalletLedger(merchantID uint, page, size int) (
 }
 
 func newFulfillmentOrderNo() string {
-	return "FO" + time.Now().UTC().Format("20060102150405") + strings.ReplaceAll(uuid.NewString()[:12], "-", "")
+	return "FO" + timeutil.Now().Format(timeutil.OrderNoLayout) + strings.ReplaceAll(uuid.NewString()[:12], "-", "")
 }
 
 func newTestFulfillmentOrderNo() string {
-	return "O" + time.Now().UTC().Format("20060102150405") + strings.ReplaceAll(uuid.NewString()[:12], "-", "")
+	return "O" + timeutil.Now().Format(timeutil.OrderNoLayout) + strings.ReplaceAll(uuid.NewString()[:12], "-", "")
 }
 
 // calculateServiceFee 按"百分比或固定"二选一计算手续费：
@@ -712,9 +713,7 @@ func (s *FulfillmentService) Dashboard(merchantID uint, isPlatformAdmin bool) (*
 	if isPlatformAdmin {
 		stats.Scope = "platform"
 	}
-	now := time.Now()
-	year, month, day := now.Date()
-	todayStart := time.Date(year, month, day, 0, 0, 0, 0, now.Location())
+	todayStart := timeutil.StartOfDay(time.Now())
 
 	productScope := func() *gorm.DB {
 		tx := s.db.Model(&model.MerchantProduct{})
@@ -1130,7 +1129,7 @@ func buildShipNotifyResultData(existing string, in ShipNotifyInput, shippedAt *t
 		m["fail_reason"] = in.FailReason
 	}
 	if shippedAt != nil {
-		m["shipped_at"] = shippedAt.Format(time.RFC3339)
+		m["shipped_at"] = timeutil.FormatAPITime(*shippedAt)
 	}
 	if in.GameChannel != nil {
 		m["game_channel"] = *in.GameChannel