Lets understand the terms first.

NEFT - National Electronic Fund Transfer
RTGS - Real Time Gross Settlement

As the term name suggests RTGS is a real time transaction and the beneficiary is credited instantly.
Customers can access the RTGS facility between 9 am to 4:30 pm on weekdays and 9 am to 1:30 pm on Saturdays

Both NEFT and RTGS requires IFSC code