Hi Amit,

WBJEE board has announced their new exam date for West Bengal Join Entrance Exam 2019. Now the WBJEE will conduct on 26th May 2019. As JEE Advanced is all India level exam its date will be fixed. Indian Institute of Technology, Roorkee has announced that JEE adavanced 2019 will now be conducted on 27th May. JEE Advanced computer based exam to be held in two different sessions for paper 1 & 2. JEE Advanced registrations will open on 3 May and will be available till 9 May and its admit card will be available for 20-27th May. 

Hence there is no chance to change the dates as already dates are declaired. Dont worry about the dates just focus on studies and be positive.

All the best !!