Thanks for asking this question. For cracking JEE 2018, it is very important to have clear details about JEE Mains 2018 Important Dates. According to the latest notification of JEE Mains 2018, the Offline exam for JEE Mains will be conducted in the 1st week of April 2018 and the Online exam will be conducted in the 2nd week of April 2018. There is no notification for the exact dates as per now. The official notification will be declared in the month of November 2017.
I have shared a link to guide you most accurately regarding all the important dates for JEE Mains 2018.