diff --git a/services/sim.go b/services/sim.go
index fcc0926..cee4435 100644
--- a/services/sim.go
+++ b/services/sim.go
@@ -40,7 +40,7 @@ func SimFlowDaySettle() (err error) {
 				getCardInfoResult      *tibiotapi.IotDataResult
 				getCardInfoResultMonth *tibiotapi.IotDataMonthResult
 			)
-			if getCardInfoResult, err = api.TibiotAPI.IotData(v.IccID, utils.Time2Str(utils.Time2Date(now.AddDate(0, 0, -1)))); err == nil {
+			if getCardInfoResult, err = api.TibiotAPI.IotData(v.IccID, now.AddDate(0, 0, -1).Format("2006-01-02")); err == nil {
 				//表示还没有同步前一天的流量，只能自己算了
 				if getCardInfoResult == nil || getCardInfoResult.SyncStatus == "1" || getCardInfoResult.CardFlow == "0KB" || getCardInfoResult.CardFlow == "" { //未同步
 					//先查当月用的总的, 减去当月已经用的总的，就是昨天用的