How can I embed a dynamically generated "semester week number" on the home page of a course?

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This will be my first foray into adding custom JS and CSS into Canvas. I do have admin access and also have access to web server space outside of Canvas.  I've seen this done on the New England Tech Canvas site.   @James  &  @lbouthillier , my contact at Instructure recommended I tag you in this question.  Any help would be greatly appreciated.