Time-bound approval converted from perpetual status for an approved institution, limiting its Income-tax Act approval duration. Approval under section 35(1)(ii) for 'The Santal Paharia Sewa Mandal Baidyanath--Deoghar, Bihar' is converted from perpetual status into a time-bound approval by Notification S.O.4098 dated 12-9-1986, limiting the institution's approved status and related tax benefits to the notification's terminal date.