I use a very simple property in my assignment descriptions to set the assignment due date:

:DUE_AT: 2019-09-26

I then pass this to an API which expects a date parameter like `2019-09-26T23:59:59-04:00`. Since I only work in one time zone, I  can just concat the property value with the additional text, though actually I have to change the `-04:00` string twice a year.  I'm wondering though how hard it would be to get the current time zone -- or the time zone that the course is taught in -- from emacs, and construct the string from that value. 

Basically, I want a simple date representation to be interpreted as "the last possible moment on this date i nthe appropriate time zone". I have not tried to use timestamps here, in part because I'm more comfortable dealing with text than with the horrors of time representations in either lisp or javascript. Alsoi, I find it very very fast to insert a  text string, and just a little bit slower and more of an interruption to add a timestamp.  I just wanted to ask how other people manage this kind of operation; maybe I should make the effort to start using DEADLINE timestamps. I don't really use them in my own time management so I'm not well-versed in how to manage them.

In nay case, I as always appreciate all of your help. 

Matt