A user (Leonardo Chaim) reported that Argentina will adopt DST, and I have found more details on Argentina's presidential web site, as well as on many news sites. Argentina will advance clocks by one hour on 2007-12-30 00:00 to (01:00) and turn them back again on 2008-03-16 00:00 (to 23:00). It appears that all of the country (all Zone-entries) are affected. The official news report about it: (Spanish) http://www.casarosada.gov.ar/index.php?option=com_content&task=view&id=1509&... which has a link to the "Comunicado"/official notice: http://www.casarosada.gov.ar/index.php?option=com_content&task=view&id=1510 translated: "The measurement will prevail in all the national territory as of the 00:00 hour of Sunday 30 of December of the present year, until the 00:00 hour of Sunday 16 of March of 2008, in that the clocks will have to retard one hour as a result of the application of the winter schedule. " News reports like http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate that Argentina will use DST next year as well, from October to March, although exact rules are not given. Best regards, Steffen / timeanddate.com