diff --git a/api/dto/Case.go b/api/dto/Case.go
index d20d7e2..e826550 100644
--- a/api/dto/Case.go
+++ b/api/dto/Case.go
@@ -84,8 +84,8 @@ func (r *CaseDto) LoadCaseItem(m []*model.CaseItem) *CaseDto {
 func (r *CaseDto) LoadIsNew(t model.LocalTime) *CaseDto {
 	now := time.Now()
 	createdAt := time.Time(t)
-	diffTime := createdAt.Sub(now)
-	if diffTime <= 7*24*time.Hour {
+	diffTime := now.Sub(createdAt)
+	if diffTime <= 7*24*time.Hour && diffTime > 0 {
 		r.IsNew = 1
 	}