Update powerwall.sh

powerwall.sh

@@ -333,7 +333,7 @@ if [ ${action-x} ]; then
 		checkacv_service) 
 			if [ "${2}" = "stop" ]; then
 				STOP_SERVICE ACV
-				echo "($datetime) Service Stopped" >> ${logacv}
+				echo "(`date +'%Y-%m-%d %H:%M:%S'`) Service Stopped" >> ${logacv}
 			else
 				CHECKACV_SERVICE
 			fi