diff --git a/screening/dist/admin/upgrade.sh b/screening/dist/admin/upgrade.sh
index 4214925d43da37b6ec129a578a4938a182bdb5db..60c30ccf8d69b421172d939fef58e4c38fca241c 100755
--- a/screening/dist/admin/upgrade.sh
+++ b/screening/dist/admin/upgrade.sh
@@ -11,7 +11,7 @@ source $BASE/env
 
 ROOT_DIR=$BASE/../servers
 
-NOW=`date +%y%m%d-%H%m`
+NOW=`date +%y%m%d-%H%M`
 BACKUP_DIR=$BASE/../backup/$NOW
 
 $BASE/alldown.sh