The Central Board of Indirect Taxes and Customs Vide Notification No 66/2018 – Central Tax dated 29th November 2018 has extended the time limit for furnishing GSTR 7 (i.e. person who is required to deduct tax at source in accordance with the provisions of section 51 of CGST Act) till 31st January 2019.
http://cbic.gov.in/resources//htdocscbec/gst/notfctn-66-central-tax-english2018.pdf