Extension of GSTR-1 due dates for high-turnover taxpayers imposes staggered monthly filing deadlines and supersedes earlier notice. Extension requires taxpayers above the specified turnover threshold to furnish FORM GSTR-1 on a staggered schedule: July-November deferred to the tenth of January, December deferred to the tenth of February, and each month through March deferred to the tenth of the following respective month; the notification is issued under state GST statutory powers and supersedes an earlier departmental notification.