Dear Bharath
The official time haven't announced yet.  But you can find the below timetable for just reference.
JEE Main Exam 2017 one of the major engineering entrance exam is scheduled to be conducted in offline mode on April 2, 2017 by the Central Board of Secondary Education (CBSE). The paper I of JEE Main will be conducted from 9:30 AM to 12:30 PM while Paper II will be conducted from 2 PM to 5 PM. It is advised to candidates that Paper I the aspirants will need to reach the exam centre at 7:00 AM for Paper I, while the distribution of test booklet will be at 9:20. As per the schedule, the seal of the test booklet will be opened by 9:25 AM.

For Paper II the JEE Main exam will commence at 2 PM. The candidates will need to entry in the exam centre for Paper II will be 1 PM, entry in exam centre 1:30 PM. While the distribution of test booklet will be 1:50 Pm for Paper II. While the seal of the test booklet will be broken/opened will be 1:55 PM. It is important to remember that the candidates cannot enter the examination hall after 2 PM
If you need more information,  comment here.
All the best.

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