diff --git a/backend/internal/modules/adminfinance/dashboard.go b/backend/internal/modules/adminfinance/dashboard.go
index de81166..d68da2f 100644
--- a/backend/internal/modules/adminfinance/dashboard.go
+++ b/backend/internal/modules/adminfinance/dashboard.go
@@ -118,8 +118,9 @@ func (r *Repository) dailyItems(ctx context.Context, query DashboardQuery) ([]Fi
 		itemsByDate[date] = FinanceDailyDTO{Date: date}
 	}
 	for _, row := range payments {
-		item := itemsByDate[row.Date]
-		item.Date = row.Date
+		date := dailyDateKey(row.Date)
+		item := itemsByDate[date]
+		item.Date = date
 		item.TotalFlowAmountCent = row.TotalFlowAmountCent
 		item.TotalRefundAmountCent = row.TotalRefundAmountCent
 		item.PendingRefundAmountCent = row.PendingRefundAmountCent
@@ -127,17 +128,18 @@ func (r *Repository) dailyItems(ctx context.Context, query DashboardQuery) ([]Fi
 		item.SuccessfulPayCount = row.SuccessfulPayCount
 		item.SuccessfulRefundCount = row.SuccessfulRefundCount
 		item.PendingRefundCount = row.PendingRefundCount
-		itemsByDate[row.Date] = item
+		itemsByDate[date] = item
 	}
 	for _, row := range settlements {
-		item := itemsByDate[row.Date]
-		item.Date = row.Date
+		date := dailyDateKey(row.Date)
+		item := itemsByDate[date]
+		item.Date = date
 		item.PlatformIncomeAmountCent = row.PlatformIncomeAmountCent
 		item.OwnerShouldIncomeAmountCent = row.OwnerShouldIncomeAmountCent
 		item.OwnerWalletIncomeAmountCent = row.OwnerWalletIncomeAmountCent
 		item.SettlementDiffAmountCent = row.OwnerShouldIncomeAmountCent - row.OwnerWalletIncomeAmountCent
 		item.SettledOrderCount = row.SettledOrderCount
-		itemsByDate[row.Date] = item
+		itemsByDate[date] = item
 	}
 
 	items := make([]FinanceDailyDTO, 0, len(itemsByDate))
diff --git a/backend/internal/modules/adminfinance/helper.go b/backend/internal/modules/adminfinance/helper.go
index 6eed500..27a2ef2 100644
--- a/backend/internal/modules/adminfinance/helper.go
+++ b/backend/internal/modules/adminfinance/helper.go
@@ -1,6 +1,7 @@
 package adminfinance
 
 import (
+	"strings"
 	"time"
 
 	"hfb_sys/backend/internal/timeutil"
@@ -24,6 +25,14 @@ func dayStart(value time.Time) time.Time {
 	return time.Date(local.Year(), local.Month(), local.Day(), 0, 0, 0, 0, loc)
 }
 
+func dailyDateKey(value string) string {
+	value = strings.TrimSpace(value)
+	if len(value) >= len("2006-01-02") {
+		return value[:len("2006-01-02")]
+	}
+	return value
+}
+
 func absCent(value int64) int64 {
 	if value < 0 {
 		return -value
diff --git a/backend/internal/modules/adminfinance/helper_test.go b/backend/internal/modules/adminfinance/helper_test.go
new file mode 100644
index 0000000..e736f56
--- /dev/null
+++ b/backend/internal/modules/adminfinance/helper_test.go
@@ -0,0 +1,25 @@
+package adminfinance
+
+import "testing"
+
+func TestDailyDateKey(t *testing.T) {
+	tests := []struct {
+		name string
+		in   string
+		want string
+	}{
+		{name: "date only", in: "2026-06-15", want: "2026-06-15"},
+		{name: "datetime", in: "2026-06-15 00:00:00", want: "2026-06-15"},
+		{name: "rfc3339", in: "2026-06-15T00:00:00+08:00", want: "2026-06-15"},
+		{name: "trim spaces", in: " 2026-06-15T00:00:00Z ", want: "2026-06-15"},
+		{name: "short value", in: "2026-06", want: "2026-06"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := dailyDateKey(tt.in); got != tt.want {
+				t.Fatalf("dailyDateKey(%q) = %q, want %q", tt.in, got, tt.want)
+			}
+		})
+	}
+}