[AngelicaDeAlquezar]

@xchic: In Mexico dates have changed because of political/financial reasons. The government wanted to keep the changes with the USA because of Wall Street timing, but people complained a lot and they decided to apply the changes two weeks after and two weeks before the changes happened in the USA. Only US-border-states will change clocks with the USA now. But the state of Sonora, which (I think) shares a border with Arizona, doesn't make those changes.