JEE Main paper II (offline) will be conducted on April 8, 2018 (2:00 p.m-5:00 p.m).

and online will be conducted on April 15 & 16, 2018 (2:00 p.m -5:00 p.m)

Last date to apply for the application form is January 1, 2018.

You can also check the complete information from the given below link

https://engineering.careers360.com/articles/jee-main-important-dates

Good Luck!!