Mexico Greenwich Mean Time
Mexico Coordinated Universal Time

In Mexico GMT is the code for Greenwich Mean Time and UTC is the code for Coordinated Universal Time. You will often see time zones represented similiar to GMT - 6h. In this example the (-6h) refers to that time zone being six hours behind GMT or UTC and so forth for the other time zones.

In areas of the Mexico that observe Daylight Saving Time local residents will move their clocks ahead one hour when Daylight Saving Time begins. As a result, their GMT offset would change from GMT - 6h to GMT - 5h. In places not oberving Daylight Saving Time the local GMT Offset will remain the same year round.

Daylight Saving Time begins at 2:00 a.m. local time on the first Sunday in April. On the last Sunday in October areas on Daylight Saving Time fall back to Standard Time at 2:00 a.m. The names in each time zone change along with Daylight Saving Time. Central Standard Time (CST) becomes Central Daylight Time (CDT), and so forth.

Mexico uses three time zones. Most of the country uses Central Standard Time. The states of Chihuahua, Nayarit, Sonora, Sinaloa and Baja California Sur use Mountain Standard Time and Baja California Norte uses Pacific Standard Time.