Mexico Time Zones Currently being used
Most of Mexico is usually in the same time zone as US CST. Exceptions are the states of Chihuahua, Sonora, Sinaloa, and Baja California Sur, which usually follow MST and Baja California Norte, which is usually in the same zone as US PST. Mexico moves onto Daylight Saving Time later that the US, on the first Sunday of April, and ends it earlier, on the last Sunday in October. Quintana Roo is the only state of the Yucatan Peninsula that do not observe DST and do not change time at all.
Cancun is within the Quintana Roo time zone