The dates are not yet announced. They should be announced within this month. Going by past years, it may be conducted on April 14 & 15 since it is normally conducted a week after the offline exam. Kepp checking https://engineering.careers360.com/exams/jee-main. The dates will be updated here the instance they are anounced.

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JEE main 2018 will be held in offline mode on April 8 and JEE main online exam is likely to be held on April 14 and 15, 2018. JEE main application form is likely to be available from the first week of December 2017. For more details on jee main important dates, check this article https://www.entrancecorner.com/engineering/jee-main-important-dates/