Fix usage of date command

Author: koelle25

entrypoint.sh

@@ -477,17 +477,17 @@ appManagePy() {
 }
 appBackup() {
     echo "Starting backup process ..."
-    if [ -d "/tmp/backup-$(date "%D-%H-%M-%S")" ]; then
-        echo "Temporary backup folder for \"$(date "%D-%H-%M-%S")\" already exists. Aborting."
+    if [ -d "/tmp/backup-$(date "+%D-%H-%M-%S")" ]; then
+        echo "Temporary backup folder for \"$(date "+%D-%H-%M-%S")\" already exists. Aborting."
         echo "Backup process failed. Exiting."
         exit 1
     fi
     local BACKUP_FOLDER
-    BACKUP_FOLDER="/tmp/backup-$(date "%D-%H-%M-%S")"
+    BACKUP_FOLDER="/tmp/backup-$(date "+%D-%H-%M-%S")"
     mkdir -p "$BACKUP_FOLDER"
     waitingForDatabase
     pg_dump -h "$DB_HOST" -p "$DB_HOST_PORT" -U "$DB_USER" "$DB_NAME" > "$BACKUP_FOLDER/database-postgres.sql"
-    tar -zcvf "$DATA_DIR/backups/backup-$(date "%D-%H-%M-%S").tar.gz" "$BACKUP_FOLDER/"
+    tar -zcvf "$DATA_DIR/backups/backup-$(date "+%D-%H-%M-%S").tar.gz" "$BACKUP_FOLDER/"
     rm -r "${BACKUP_FOLDER:?}/"
     echo "Backup process succeeded."
     exit 0