Daylight Savings Time is now in effect across all of Mexico.
Daylight Saving Time begins in the spring and ends in the fall. Standard time is observed from late fall to early spring.
Daylight Saving Time is not observed in the State of Sonora (the City of Nogales, etc.), as it remains on Mountain Standard Time throughout the year.Additional details on worldwide timezones
The worldwide standard for coordinated universal time, formerly known as GMT (Greenwich Mean Time), is now abbreviated as UTC (Coordinated Universal Time).
Some sources still refer to it as UTC/GMT and some web browsers, e.g. Mozilla Firefox, still display it as GMT.
The UTC Time (shown directly below) is the standard time zone upon which all other worldwide time zones are based. It never observes daylight saving time.