07 April 2020
No... Due Date not extended. But, Taxpayers can be file the GSTR 1 return on or before 30th Jun-2020 with waiver of late fee...
We can take it as extending the due dates. it's applicable for the months of March, 2020, April, 2020 and May, 2020, and for the quarter ending 31st March, 2020...
10 April 2020
Due date not extended but late fee is waived.Please see this video to underpants calculation of interest, waiver of late fee etc. in detail.