Time Zone History

Matamoros time zone history

Standard time has stayed at UTC−6 since 1921, the longest run of the 6 zones in Mexico with no change of standard time since 1970. On standard time, clocks in Matamoros run 30 minutes ahead of local mean solar time.

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.

Covers: Coahuila, Nuevo León and Tamaulipas (US border) · tz database name America/Matamoros

Convert a time from Matamoros

Summer time in 32 of 57 years since 1970

UTC−6:30: 30 minutes behind today’s standard timeUTC−6: today’s standard timeUTC−5: 1 hour ahead of today’s standard timeUTC−6:30: 30 minutes behindtoday’s standard timeUTC−6: today’s standard timeUTC−5: 1 hour ahead of today’sstandard time

How to read this chart

Before 1970

19101920193019401950196019701910192019301940195019601970
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
December 31, 1921Local mean time (UTC−6:30) replacedUTC−6CST

Daylight saving periods

YearsClocks go forwardClocks go backShift and labels
1988April 3October 301 hour, CST to CDT
1996–2000first Sunday in April, 02:00last Sunday in October, 02:001 hour, CST to CDT
2001May 6September 301 hour, CST to CDT
2002–2009first Sunday in April, 02:00last Sunday in October, 02:001 hour, CST to CDT
2010–2037second Sunday in March, 02:00first Sunday in November, 02:001 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

Monterrey (Mexico), Mexico City (Mexico), Ojinaga (Mexico), Chihuahua (Mexico), Bahía de Banderas (Mexico), Mérida (Mexico), Belize, Guatemala, El Salvador and Tell City, Indiana (United States) (nearest first; 17 more on the list of offsets).

Clocks next door since 1970

  • Monterrey (283 km): same time except 1,351 days in 2010–2026.
  • Mexico City (735 km): same time except 1,561 days in 1988 and 2010–2026.
  • Ojinaga (797 km): same time except 9,190 days in 1988 and 1998–2022.
  • Chihuahua (904 km): same time except 10,142 days in 1988 and 1998–2026.
  • Mazatlan (948 km): usually 1 hour behind; different on 1,562 days in 1988 and 1996–2026.

How it compares

Clocks have been changed 64 times since 1970, the second-most of the 12 zones in Mexico.