diff --git a/sql/common.sh b/sql/common.sh
index ac11a2cf..dd994400 100644
--- a/sql/common.sh
+++ b/sql/common.sh
@@ -83,3 +83,8 @@ EOF
     # init backup catalog
     init_catalog
 }
+
+function get_time_last_backup()
+{
+	pg_arman -B ${BACKUP_PATH} show | tail -n +4 | head -n 1 | awk '{print($1, $2)}'
+}
diff --git a/sql/delete.sh b/sql/delete.sh
index dc5904ac..41ca57a4 100644
--- a/sql/delete.sh
+++ b/sql/delete.sh
@@ -10,14 +10,14 @@
 init_backup
 echo '###### DELETE COMMAND TEST-0001 ######'
 echo '###### delete full backups ######'
-FIRST_BACKUP_DATE=`date +"%Y-%m-%d %H:%M:%S"`
 pg_arman backup -B ${BACKUP_PATH} -b full -p ${TEST_PGPORT} -d postgres --quiet
+FIRST_BACKUP_DATE=$(get_time_last_backup)
 pgbench -p ${TEST_PGPORT} >> ${TEST_BASE}/pgbench.log 2>&1
-SECOND_BACKUP_DATE=`date +"%Y-%m-%d %H:%M:%S"`
 pg_arman backup -B ${BACKUP_PATH} -b full -p ${TEST_PGPORT} -d postgres --quiet
+SECOND_BACKUP_DATE=$(get_time_last_backup)
 pgbench -p ${TEST_PGPORT} >> ${TEST_BASE}/pgbench.log 2>&1
-THIRD_BACKUP_DATE=`date +"%Y-%m-%d %H:%M:%S"`
 pg_arman backup -B ${BACKUP_PATH} -b full -p ${TEST_PGPORT} -d postgres --quiet
+THIRD_BACKUP_DATE=$(get_time_last_backup)
 pg_arman validate -B ${BACKUP_PATH} --quiet
 
 echo "try to delete the oldest backup"
@@ -32,18 +32,18 @@ echo "Number of deleted backups should be 1, is it so?: ${NUM_OF_DELETED_BACKUPS
 init_backup
 echo '###### DELETE COMMAND TEST-0002 ######'
 echo '###### keep backups which are necessary for recovery ######'
-FIRST_BACKUP_DATE=`date +"%Y-%m-%d %H:%M:%S"`
 pg_arman backup -B ${BACKUP_PATH} -b full -p ${TEST_PGPORT} -d postgres --quiet
+FIRST_BACKUP_DATE=$(get_time_last_backup)
 pgbench -p ${TEST_PGPORT} >> ${TEST_BASE}/pgbench.log 2>&1
-SECOND_BACKUP_DATE=`date +"%Y-%m-%d %H:%M:%S"`
 pg_arman backup -B ${BACKUP_PATH} -b full -p ${TEST_PGPORT} -d postgres --quiet
+SECOND_BACKUP_DATE=$(get_time_last_backup)
 pg_arman validate -B ${BACKUP_PATH} --quiet
 pgbench -p ${TEST_PGPORT} >> ${TEST_BASE}/pgbench.log 2>&1
-THIRD_BACKUP_DATE=`date +"%Y-%m-%d %H:%M:%S"`
 pg_arman backup -B ${BACKUP_PATH} -b page -p ${TEST_PGPORT} -d postgres --quiet
+THIRD_BACKUP_DATE=$(get_time_last_backup)
 pg_arman validate -B ${BACKUP_PATH} --quiet
-FOURTH_BACKUP_DATE=`date +"%Y-%m-%d %H:%M:%S"`
 pg_arman backup -B ${BACKUP_PATH} -b full -p ${TEST_PGPORT} -d postgres --quiet
+FOURTH_BACKUP_DATE=$(get_time_last_backup)
 pg_arman validate -B ${BACKUP_PATH} --quiet
 
 echo "try to delete before third backup"
diff --git a/sql/show.sh b/sql/show.sh
index e7b21d1d..d94ad238 100644
--- a/sql/show.sh
+++ b/sql/show.sh
@@ -70,8 +70,8 @@ echo '###### Status DELETED ######'
 init_catalog
 pg_arman backup -B ${BACKUP_PATH} -b full -p ${TEST_PGPORT} -d postgres --quiet;echo $?
 pg_arman validate -B ${BACKUP_PATH} --quiet > /dev/null 2>&1;echo $?
-DELETE_DATE=`date +"%Y-%m-%d %H:%M:%S"`
 pg_arman backup -B ${BACKUP_PATH} -b full -p ${TEST_PGPORT} -d postgres --quiet;echo $?
+DELETE_DATE=$(get_time_last_backup)
 pg_arman validate -B ${BACKUP_PATH} --quiet > /dev/null 2>&1;echo $?
 pg_arman delete ${DELETE_DATE} -B ${BACKUP_PATH} > /dev/null 2>&1;echo $?
 pg_arman show -B ${BACKUP_PATH} > ${TEST_BASE}/TEST-0004-show.out 2>&1