demxic wrote:
I am sorry I cannot still confirm this issue, I have sent an email to Mexico´s CETRAM and I am waiting for an official response.
Thanks for following up on this. It would be helpful to know: * Does the 03:00->02:00 transition occur only in Mexico City, or do other parts of the country also have a 03:00->02:00 transition instead of 02:00->01:00? * If the transition was 02:00->01:00 in previous years, what was the first year that Mexico City switched to the new rules that use 03:00->02:00? * What is the official law or regulation that specifies the transition times? I'm asking because the most recent national decree that I can see is here: http://www.diputados.gob.mx/LeyesBiblio/pdf/Dec_HEEUM_280417.pdf It's dated 2017-04-28 and says "a aplicación de este horario estacional surtirá efecto desde las dos horas del segundo domingo de marzo y concluirá a las dos horas del primer domingo de noviembre", which makes it sound like the fall transition should be 02:00->01:00 - unless that "dos horas" means 02:00 *standard* time instead of 02:00 *current* time, a possible but unusual interpretation that I would normally expect to be spelled out. Although I found several news sources saying there was a 03:00->02:00 transition this fall, I also found some saying that the transition was 02:00->01:00: https://vanguardia.com.mx/articulo/todo-lo-que-debes-saber-sobre-el-cambio-d... https://www.6enpunto.mx/bienestar/el-horario-de-invierno-inicia-el-28-de-oct... so it appears at the least that there is some confusion here.