CBEC vide circular no. 41(CGST) dated 13-10-2017 extended due date of  return GSTR 4 for assesses opted for composition scheme for the quarter July to September 2017 to 15th November, 2017.
The due date for filing returns in GSTR 6 by input service distributor for the period July 2017, August 2017 and September 2017 extended  to 15th November, 2017 vide notification 43/2017 (Central tax).

Also the due date for filing returnsFORM GSTR-5A for the month of July, 2017, August, 2017 and September, 2017 by a person supplying online information and database access or retrieval services from a place outside India to a non-taxable online recipient referred to in section 14 of the Integrated Goods and Services Tax Act, 2017 and rule 64 of the Central Goods and Services Tax Rules, 2017, till the 20th day of November, 2017 by notification 42/2017 (Central Tax)

To see the notifications please click the link below:

Notification 41 (Central Tax)

Notification 42 (Central Tax)

Notification 43 ( Central Tax)