In case there's a sentence
The following students are required to submit their assignments by March 15th.
Will there be a colon after 15 or a full stop?
As far as there is a list of students to follow, a colon is the appropriate punctuation mark here.
A colon can introduce a list.
The main points are as follows: (1)...., (2)....., (3).....
We need three kinds of support: economic, moral and political.
(Practical English Usage by Michael Swan)