Extension of GST compliance period: covered period extended and filing deadline moved to end of March 2019. Amendment substitutes the temporal scope of an earlier notification by replacing 'July, 2017 to November, 2018' with 'July, 2017 to February, 2019' and correspondingly extends the compliance deadline from the end of December to the end of March 2019, thereby extending the period and postponing the cut-off date under the prior notification without altering its other substantive conditions.