Ojinaga time zone history
Seasonal clock changes began only in 1996 and are still in use. On October 30, 2022 the summer offset, UTC−6, became permanent standard time; the clocks did not move that day. On standard time, clocks at Ojinaga run 58 minutes ahead of local mean solar time, the third-largest gap of the 10 zones in Mexico whose clocks run ahead of the sun.
UTC−6
Standard time is UTC−6 (CDT/CST); clocks go forward to UTC−5 on the second Sunday in March and back on the first Sunday in November.
Summer time in 31 of 57 years since 1970
Before 1970
Standard time changes
| Date | Change | New standard time | Clock label |
|---|---|---|---|
| Before 1970 | |||
| January 1, 1922 | Local mean time (UTC−6:57:40) replaced | UTC−7 | MST |
| June 10, 1927 | Standard time forward 1 hour | UTC−6 | CST |
| November 15, 1930 | Standard time back 1 hour | UTC−7 | MST |
| April 1, 1932 | Standard time forward 1 hour | UTC−6 | CST |
| Since 1970 | |||
| April 5, 1998 | Summer offset kept as standard time; clocks did not move | UTC−7 | MST |
| October 30, 2022 | Summer offset kept as standard time; clocks did not move | UTC−6 | CST |
Daylight saving periods
| Years | Clocks go forward | Clocks go back | Shift and labels |
|---|---|---|---|
| Before 1970 | |||
| 1931 | April 30 | October 1 | 1 hour, MST to MDT |
| Since 1970 | |||
| 1996–1997 | first Sunday in April, 02:00 | last Sunday in October, 02:00 | 1 hour, CST to CDT |
| 1998 | not that year | October 25 | 1 hour |
| 1999–2000 | first Sunday in April, 02:00 | last Sunday in October, 02:00 | 1 hour, MST to MDT |
| 2001 | May 6 | September 30 | 1 hour, MST to MDT |
| 2002–2009 | first Sunday in April, 02:00 | last Sunday in October, 02:00 | 1 hour, MST to MDT |
| 2010–2021 | second Sunday in March, 02:00 | first Sunday in November, 02:00 | 1 hour, MST to MDT |
| 2022 | March 13 | not that year | 1 hour, MST to MDT |
| 2023–2037 | second Sunday in March, 02:00 | first Sunday in November, 02:00 | 1 hour, CST to CDT |
Clock changes in 2026, 2027 and 2028
The clocks go forward 1 hour (CST to CDT) on March 8, 2026, March 14, 2027 and March 12, 2028 at 02:00 and back 1 hour (CDT to CST) on November 1, 2026, November 7, 2027 and November 5, 2028 at 02:00, local time.
Also on UTC−6
Chihuahua (Mexico), Monterrey (Mexico), Matamoros (Mexico), Bahía de Banderas (Mexico), Mexico City (Mexico), Mérida (Mexico), Tell City, Indiana (United States), New Salem, North Dakota (United States), Center, North Dakota (United States) and Beulah, North Dakota (United States) (nearest first; 17 more on the list of offsets).
Clocks next door since 1970
- Chihuahua (192 km): same time except 1,344 days in 2010–2026.
- Ciudad Juárez (312 km): same time except 1,493 days in 2022–2026; 1 hour behind today.
- Monterrey (593 km): same time except 9,743 days in 1988 and 1998–2026.
- Hermosillo (637 km): usually 1 hour behind; different on 4,621 days in 1996–2026.
- Mazatlan (734 km): usually 1 hour behind; different on 9,534 days in 1996–2026.