I have an app that needs to track a local time and the different from 
UTC.  If I do this:

    DateAndTime localTimeZone:
       (TimeZone offset: -5 hours name: 'EST5EDT' abbreviation: 'EST5EDT').

Then it is easy for me to make conversions to UTC using #asUTC.  The 
problem is this offset needs to be adjusted twice a year.  I've looked 
at the time zone plugin but it seems pretty heavyweight for something 
that is /almost/ workable in the image.  Does anyone have a solution for 
this?

I'm using Squeak3.9.1 if it makes a difference.

David