Mexico’s Autumn Clock Change in 2017 Except for two Mexican states that won't observe DST, Mexico's clocks go back one hour...
Mexico Clock-Time Changes: Spring & Autumn 2017 Mexico's clocks move back one hour on Oct 29 or Nov 5, depending on the location
Mexico Clock-Time Changes: Autumn 2016 This article explains the spring and autumn clock-time changes taking place in Mexico in 2016.
Mexico Clock-Time Changes in 2015 Mexico's mainland autumn clock changes take place on October 25th and the state of Baja California will change its clocks on November 1st