You need to appear on any one date as mentioned jn your admit card.
If its rightly mentioned 15th april, then one has to be present during the date and time slot allotted.
Only under certain emergency circumstances, on emight be allowed to appear on next day, that too one has to write down letter to concerned authorities, in ghis case CBSE board.

To know more details about important Date, Time and Slots check below.

https://www.google.co.in/amp/s/engineering.careers360.com/articles/jee-main%3famp

You can mention the slot you want your exam to be on while registering for JEE Main 2018 and Accordingly you shall be granted slot, after which there is no scope for change. So plan Wisely.

All the best.

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