GSTR2 will be a auto generated detail generated by the GSTR1 of your suppliers.Further, the registered person has to add, correct, modify in such returns any discrepancy he npotices from his suppliers and the person will have to add details of purchase from unregistered dealers in such return.
The government has issued a notification notifying the last dates for filing of GSTR2 for the months of July and August. The last dates are:
For July, 2017: 6th to 10th September, 2017
For August, 2017: 21st to 25th September, 2017.
Find the notification below: