Nov 2, 2025, 2:00 am
In small parts of Mexico
| Country: | Mexico |
|---|---|
| Long Name: | United Mexican States |
| Abbreviations: | MX, MEX |
| Capital: | Mexico City |
| Time Zones: | 3 |
| Dial Code: | +52 |
Note: Only some parts of Mexico used DST in 1978.
Apr 30
Forward 1 hour
Apr 30, 1978 - Daylight Saving Time Started
When local standard time was about to reach
Sunday, April 30, 1978, 2:00:00 am clocks were turned forward 1 hour to
Sunday, April 30, 1978, 3:00:00 am local daylight time instead.
Sunrise and sunset were about 1 hour later on Apr 30, 1978 than the day before. There was more light in the evening and less light in the morning.
Also called Spring Forward, Summer Time, and Daylight Savings Time.
Oct 29
Back 1 hour
Oct 29, 1978 - Daylight Saving Time Ended
When local daylight time was about to reach
Sunday, October 29, 1978, 2:00:00 am clocks were turned backward 1 hour to
Sunday, October 29, 1978, 1:00:00 am local standard time instead.
Sunrise and sunset were about 1 hour earlier on Oct 29, 1978 than the day before. There was more light in the morning and less light in the evening.
Also called Fall Back and Winter Time.
When Does DST Start and End in Mexico?
Most of Mexico, including its capital Mexico City, doesn't use Daylight Saving Time (DST). However, some exceptions exist for the locations that follow the DST schedule of the United States:
- Baja California observes DST and uses the same time zones as neighboring California in the US. Here, the DST period starts on the second Sunday in March and ends on the first Sunday in November.
- Sonora does not change its clocks to stay in sync with the neighboring US state of Arizona, where Mountain Standard Time (MST) is observed all year.
- Municipalities near the country's northern border with the US keep the DST schedule for practical and socioeconomic reasons. This includes the municipalities Ciudad Juárez and Ojinaga in Chihuahua, Colombia in Nueva Leon, and Reynosa in Tamaulipas.
Which States and Federal Districts use Daylight Saving Time in 1978
Areas in Mexico on standard time all of 1978
DST in States and Federal Districts in Mexico in 1978 (32 in total, 1 where all observe DST, 31 which don't observe DST) |
|||||
|---|---|---|---|---|---|
| Aguascalientes | No DST | Guerrero | No DST | Quintana Roo | No DST |
| Baja California | Apr 30 – Oct 29 | Hidalgo | No DST | San Luis Potosí | No DST |
| Baja California Sur | No DST | Jalisco | No DST | Sinaloa | No DST |
| Campeche | No DST | Michoacán | No DST | Sonora | No DST |
| Chiapas | No DST | Morelos | No DST | Tabasco | No DST |
| Chihuahua | No DST | México | No DST | Tamaulipas | No DST |
| Ciudad de México | No DST | Nayarit | No DST | Tlaxcala | No DST |
| Coahuila de Zaragoza | No DST | Nuevo León | No DST | Veracruz | No DST |
| Colima | No DST | Oaxaca | No DST | Yucatán | No DST |
| Durango | No DST | Puebla | No DST | Zacatecas | No DST |
| Guanajuato | No DST | Querétaro | No DST | ||
Daylight Saving Time History in Mexico
- Mexico first observed Daylight Saving Time in 1931.
- Mexico has observed DST for 70 years between 1931 and 2025 (DST in at least one location).
- Previous time with no Daylight Saving Time was 1975.
- See Worldwide DST Statistics
Baja California Pioneered DST
The state of Baja California introduced seasonal clock changes in 1931, remaining the only area in Mexico with a DST schedule for 65 years.
In the rest of the country, DST was introduced in 1996 and removed in 2022.