filing gstr3b and gstr 1 simultaneously

a person registered under gst voluntary with turnover less than 1.5 cr is suppose to file GSTR-3 for the month of March 2018 as on 20-04-2018 and also gstr 1 for the quarter March 2018 which is due on 30-04-2018. can both be complied before 20-04-2018?