Hello Pralay,

 IIT Roorkee which is conducting the exam has announced the revised exam date for JEE Advanced 2019 as May 27. JEE Advanced is conducted by the seven Zonal Coordinating IITs under the guidance of the Joint Admission Board (JAB). The seven IITs are IIT Kharagpur, IIT Kanpur, IIT Madras, IIT Delhi, IIT Bombay, IIT Guwahati and IIT Roorkee. Admissions to the Bachelor’s, Integrated Master’s and Dual Degree programs (entry at the 10+2 level) in all the 23 IITs is on the basis of JEE Advanced 2019 ranks. 

This JEE Advanced exam is what was formerly called the IIT JEE exam. Only candidates who have qualified the JEE Mains exam can appear for the JEE Advanced exam.

For more information, follow the below link:

Https://engineering.careers360.com/exams/jee-advanced