Admission date is different for different colleges.
But most of the good and high ranked colleges started their admission from counseling in July first week.
And all admission is done by the last week of July.
But some colleges delayed the admission process and it is last going till August 15.
So I would suggest to check for the specific college in which you want to go on their official website.
So good luck.
Admission of UG course of all the colleges will start in nee session of 2019 between June to August and entrance(if done) will take place in probably may.
Forms are out from end of april onwards.