[O] Export Agenda to Google Calendar ICS Format

[Tory S. Anderson]

Cross-posted from 
http://stackoverflow.com/questions/23463962/emacs-export-calendar-bad-timezone-format-in-ics

Using orgmode I export my agenda to an ics file, upload it to my site, and 
import it into Google calendar. This seems like an easy ideal solution, but 
when I check the calendar I find that it is not recognizing the time zone of my 
ics file and so is assuming GMT, making my imported times uselessly off. The 
problem seems to be the same as the one described here:

http://blog.jonudell.net/2011/10/17/x-wr-timezone-considered-harmful/

Checking my exported ics, sure enough, it is using X-WR-TIMEZONE:EST, which 
Google calendar does not respect. This must be a well-known problem, but I 
haven't been able to locate a solution anywhere. Help would be appreciated: how 
can I get the right time on my events (and they must be a feed; the "add to 
calendar" trick is no good)?