Change in Uruguay time zone

Hello, I am writing to this address, as directed in http://www.twinsun.com/tz/tz-link.htm The uruguayan government has decreed a change in the local time. The decree in the government's web site (in Spanish): http://www.presidencia.gub.uy/decretos/2004091502.htm This means that from 19/9/2004 (at 0:00 local time) until 13/3/2004 (at 0:00 local time) official time in Uruguay will be at GMT -2 This means that the file "zoneinfo/southamerica" should be changed. I assume the change must be to add the following 2 lines (warning: this is the first time I have touched a time zone file): Rule Uruguay 2004 only - Sep 19 0:00 1:00 S Rule Uruguay 2005 only - Mar 13 0:00 0 - I am no authority in Uruguay, just a timezone user. Yours, Eduardo Cota.