Gentlemen (and women), we have an early definition of perpetual DST in Uruguay. The government of Uruguay wants to be predictable ... grin 8-) ... at least in timezone matters. The web page http://www.presidencia.gub.uy/_web/decretos/2006/09/09_2006.htm states that "04/09/06 - SE ADELANTA LA HORA OFICIAL A PARTIR DE LA HORA 02:00 AM DEL PRIMER DOMINGO DEL MES DE OCTUBRE DE CADA AÑO. DEC. N° 311/006" translation "04/09/06 - official time will be advanced at 2:00 AM of the First Sunday of October of every year". It links to http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_ 00001.PDF which have the following 4 points: I) that the (DST) measure is meant to produce conditions for a saving of energy and an improvement in the daily use (of electricity) and a displacement of the peak of summer electricity use. II) that it is convenient for all involved, to consolidate a periodic and predictable system of this adjustment of clocks. III) that for the above reasons the official time will be adjusted to the period 2:00 AM of the First Sunday of October and 2:00 AM of the Second Sunday of March each year. IV) that the proposed measure will become an important energy saving. Especially I like the second point, there are unfortunately few governments that don't have a predictable timezone system yet, which convert to a predictable system where timezone changes can be calculated into the future, well, at least in theory. I will not go into the details of how the Uruguay rule in the southamerica file should be changed, except that for 2006 and perpetually DST starts "Oct Sun>=1" and ends "Mar Sun>=8". Regards, - Jesper Jesper Nørgaard Welen Email: jnorgard@Prodigy.Net.mx Project Leader (Líder de Proyecto) Software CIMMYT - Centro Internacional de Mejoramiento de Maíz y Trigo Dirección: CIMMYT Int. c/o Jesper Nørgaard Km. 45, Carretera México-Veracruz El Batán Texcoco, Edo. de México CP 56130 MEXICO Tel.: +52 (55) 58-04-20-04 ext. 1374 Fax: +52 (55) 58-04-75-58 Tel. Casa: 53-10-05-95 ó 53-10-97-78 Download the shareware program World Time Explorer, I made: http://www.worldtimeexplorer.com/index.html