Hi Priyanka,

Following are the dates you should be considering:-

• June 16, 2019 - Candidate registration and Choice filling for academic programs under JoSAA starts; Candidates who would write AAT can fill their choices starting from June 21, 2019, after the declaration of AAT results
• June 22, 2019 - Display of Mock Seat Allocation-1 based on the choices filled in by candidates.
• June 24, 2019 - Display of Mock Seat Allocation-2 based on the choices filled in by candidates.
• June 25, 2019 - Candidate registration and Choice filling for academic programs under JoSAA ends

Here are few important links for you:-

https://engineering.careers360.com/articles/josaa

https://josaa.nic.in/

Thank You.