QUERY REGARDING ASSIGNMENT SUBMISSION.

I am a BCA_NEWOL student and i thought that the last date for assignment submission was 30th april so i submitted 4 of my assignments on the last day online ( yes my rc takes assignments online , lsc 2900. ) becasue i couldn't complete the 5th one. Now everyone is telling me that the date is extended , so what do i do. Can i complete the 5th one now and submit it or do i have to do something else.