LatAm Time Zone Overlap by City: A 2026 Guide for US Engineering Leaders

Pop quiz: It's 9:30 a.m. Pacific, and your standup is starting. What time is it for your engineers in LatAm?

It's a trick question. The answer depends on the city and the season. In Buenos Aires, it's 2:30 p.m. in January and 1:30 p.m. in late March. In Mexico City, it's 11:30 a.m. in January and 10:30 a.m. in late March.

Nearshore providers like to promote the fact that LatAm overlaps with US hours. This may be true, but it's too broad to plan a sprint around. Real overlap depends on the city, the US time zone, and the time of year.

This guide answers a narrower question. For different major LatAm tech hubs, how many hours of a 9 a.m. to 5 p.m. workday line up with US Eastern, Central, and Pacific time in each season? Which team rituals fit inside that window?

Every city covered here is home to a Howdy House, one of the local offices where Howdy professionals can work in person.

TL;DR

A standard 9 a.m. to 5 p.m. workday in a major LatAm engineering city shares three to eight hours with a 9 a.m. to 5 p.m. US workday. Bogotá, Medellín, and Lima share the most with Eastern and Central time. Mexico City and Guadalajara share the most with Pacific time.

• Mexico City and Guadalajara (UTC-6 all year): 6 to 8 shared hours with every US zone, including 6 to 7 hours with Pacific time.
• Bogotá, Medellín, and Lima (UTC-5 all year): a full 8 hours with Eastern time from November to March and with Central time from March to November, plus 5 to 6 hours with Pacific time.
• São Paulo, Florianópolis, Buenos Aires, Córdoba, and Montevideo (UTC-3 all year): 6 to 7 hours with Eastern time and 3 to 4 hours with Pacific time.
• Santiago changes clocks: UTC-3 from September 6, 2026, to April 3, 2027, then UTC-4 until September 4, 2027, under Chile's Decree 98. Its overlap with Eastern time runs 6 to 8 hours depending on the month.
• US clocks set the rhythm: US daylight time ended November 1, 2026, and starts again March 14, 2027. Every LatAm city above except Santiago keeps one offset all year, so the US switch alone moves each shared window by an hour.

The state of cross-time-zone engineering work in 2026

Distributed engineering is now the norm. However, the cost of a narrow overlap shows up in calendars after hours. Microsoft's Work Trend Index special report (June 2025), based on aggregated Microsoft 365 signals, found that meetings after 8 p.m. rose 16% year over year. Nearly a third of meetings now span multiple time zones, up 35% since 2021.

Developers work that way too. In the Stack Overflow 2025 Developer Survey, 32.4% of all respondents said they work fully remote, and 45% of US respondents did.

Howdy's own survey of 1,010 US tech workers (July and August 2024) found that 73% already work with international coworkers and listed time zone difficulties among the main challenges. Respondents also said just over half of their workload can be done asynchronously. The rest is the work a shared window has to hold.

Why I wrote this

I'm a recovering digital nomad. I've lived across the world, from Medellín, Mexico City, and Buenos Aires to Bali, Hanoi, and Chiang Mai. While working remotely in far-flung locals, I witness time zone challenge from both sides of the world.

From Asia, overlapping with a US team means working late at night or very early in the morning. In LatAm, the overlap is real, and the details change from city to city. Medellín and Mexico City sit close to US hours, while Buenos Aires runs one to two hours ahead of the East Coast and four to five ahead of the West Coast. Guides that treat LatAm as one time zone miss those differences. In this guide, I take you city by city and highlight countries with multiple time zones.

Working-hour overlap by city

The two tables below show how many hours a 9 a.m. to 5 p.m. local workday shares with a 9 a.m. to 5 p.m. US workday, and when that shared block falls on the US clock. The first covers US standard time; the second covers US daylight time. Cities are the LatAm locations of Howdy's offices, listed on Howdy's city guides page. Offsets are as of November 2026.

US standard time: November 1, 2026, to March 13, 2027

US Eastern is UTC-5, Central is UTC-6, and Pacific is UTC-8.

US daylight time: March 14 to November 6, 2027

US Eastern is UTC-4, Central is UTC-5, and Pacific is UTC-7. Santiago gets two rows because Chile changes its own clocks inside this period.

The pattern holds in other years as long as the rules in the next section stay in force. US daylight time ran from March 8 to November 1 in 2026, and Chile's winter time ran from April 5 to September 5, 2026.

Country rules and exceptions to check

Six of the seven countries keep one offset all year in the cities listed above. Chile is the exception, and Mexico and Brazil both have regional zones that can trip up a calendar, so confirm the city before you confirm the meeting time. Rules below are as of November 2026.

Mexico: one rule for most of the country, another for the border

Mexico's Ley de los Husos Horarios, published October 28, 2022, ended seasonal clock changes for most of the country. Mexico City and Guadalajara sit in the Central zone and stay on UTC-6 all year. Municipalities along the northern border, including Tijuana and Ciudad Juárez, still change clocks with the US. Quintana Roo, home to Cancún, stays on UTC-5, and Sonora stays on UTC-7.

Chile: clocks move on the opposite season from the US

Chile's Decree 98, published July 2, 2026, sets summer time from the first Saturday of September to the first Saturday of April through April 2029. Santiago runs on UTC-3 during that period and UTC-4 the rest of the year. Because Chile and the US switch at different times, a Santiago meeting moves on the US calendar up to four times a year. The Aysén and Magallanes regions stay on UTC-3 all year, so Punta Arenas does not follow Santiago's winter change.

Brazil: no daylight time, several zones

Brazil ended daylight saving time by Decree 9,772 in 2019, and the federal government decided not to bring it back for the 2026 to 2027 summer. São Paulo and Florianópolis use Brasília time, UTC-3, all year. Western states run behind that, with Manaus on UTC-4 and Rio Branco on UTC-5.

Colombia, Peru, Argentina, and Uruguay: fixed offsets

Colombia and Peru stay on UTC-5 all year. Argentina, including Buenos Aires and Córdoba, stays on UTC-3. Uruguay dropped daylight saving time in 2015 and stays on UTC-3. For these cities, the only seasonal shift a US team sees comes from US clocks, which change on the second Sunday of March and the first Sunday of November.

Which city pairs fit standups, live pairing, and West Coast work

Every city in this guide leaves room for a daily standup with every US zone on a standard schedule. The differences show up in longer live work and on the West Coast. Match the city to where your US engineers and product leads sit, then to the rituals that need people online together.

A few patterns hold across the tables:

• Eastern teams get the most with Bogotá, Medellín, and Lima, which match Eastern time exactly from November to March. The UTC-3 cities and Santiago still share six to eight hours, with the overlap front-loaded into the US morning.
• Central teams get a full day with Mexico City and Guadalajara in winter and with Bogotá, Medellín, and Lima in summer. Every other city shares at least five hours.
• Pacific teams do best with Mexico City and Guadalajara, which keep six to seven shared hours all year. Santiago's winter time, from April to early September, gives Pacific teams one more hour than Buenos Aires or São Paulo.
• Split US teams that span Eastern and Pacific time can center on Mexico City, Guadalajara, Bogotá, Medellín, or Lima, which keep at least five hours with both coasts in every season.
• Shifted hours widen any window. A São Paulo engineer who works 10 a.m. to 6 p.m. local adds an hour with Pacific time. Treat that as an agreement with the person and their team, and write it into the working norms.

How these numbers were calculated

Every overlap figure in this guide comes from the same simple method, so you can rerun it for any city or schedule.

• Workday: 9 a.m. to 5 p.m., Monday to Friday, on both sides. Lunch breaks are not subtracted, so treat each figure as the outer edge of the shared window.
• Method: convert both workdays to UTC and count the hours where they overlap. The shared block is shown in US local time.
• Offsets: taken from the IANA Time Zone Database (release 2026f) for each city's zone and checked against the official rules cited above for the US, Mexico, Chile, Brazil, and Uruguay.
• Dates: US standard time from November 1, 2026, to March 13, 2027, and US daylight time from March 14 to November 6, 2027. Chile's changes fall at midnight after the first Saturday of April and September.
• What it leaves out: public holidays, which differ by country and can remove a full day of overlap; shifted or flexible schedules; and US states or territories that do not observe daylight time, such as Arizona and Hawaii.

To check a different schedule, shift the start and end times on one side and repeat the count. An 8 a.m. to 4 p.m. US Pacific day, for example, adds one shared hour with every LatAm city in this guide.

Where Howdy fits

Howdy is a global workforce partner that builds embedded engineering teams across Mexico, Colombia, Brazil, Argentina, Chile, Peru, and Uruguay. The professionals it places work as full-time members of a partner's team, working inside that team's own rituals and tools. Howdy runs offices called Howdy Houses in the cities covered here and supports hiring through contractor-of-record (COR), employer-of-record (EOR), direct-contract, or custom arrangements.

For engineering leaders, that footprint means the city question can be settled before the search starts. A Pacific team can recruit from Mexico City or Guadalajara for long pairing windows, and an Eastern team can draw on Bogotá, Medellín, Lima, or the Southern Cone hubs. For the regional view, see Howdy's LatAm, Eastern Europe, and Asia time zone comparison, and for talent supply by country, its developer population data.

If you're mapping a new team to your calendar, talk with Howdy about which cities fit the way your team works.

Frequently Asked Questions

Which LatAm city has the most overlap with US Eastern time?

Bogotá, Medellín, and Lima share a full 8-hour workday with US Eastern time from November to March, when both sides run on UTC-5. From March to November they share 7 hours, from 10 a.m. to 5 p.m. ET. Santiago also shares 8 hours with Eastern time from April to early September.

Which LatAm city overlaps best with US Pacific time?

Mexico City and Guadalajara overlap best with US Pacific time among major LatAm engineering hubs. They share 6 hours with a Pacific workday in US standard time and 7 hours in US daylight time. Bogotá, Medellín, and Lima follow with 5 to 6 hours.

How many hours does Mexico City share with a New York workday?

Mexico City shares 7 hours with a 9 a.m. to 5 p.m. New York workday from November to March, from 10 a.m. to 5 p.m. ET. From March to November it shares 6 hours, from 11 a.m. to 5 p.m. ET, because Mexico City stays on UTC-6 while New York moves to UTC-4.

Does Mexico still observe daylight saving time?

Most of Mexico, including Mexico City and Guadalajara, stopped changing clocks under the Ley de los Husos Horarios published in October 2022. Municipalities on the northern border, such as Tijuana and Ciudad Juárez, still change clocks with the US.

What time is it in São Paulo at 9 a.m. in San Francisco?

At 9 a.m. in San Francisco it is 2 p.m. in São Paulo from November to March and 1 p.m. from March to November. São Paulo stays on UTC-3 all year, so the gap changes only when US clocks change.

Does Chile change its clocks in 2027?

Yes. Santiago moves from UTC-3 to UTC-4 after the first Saturday of April 2027 and returns to UTC-3 after the first Saturday of September 2027, under Decree 98, which sets the schedule through April 2029. The Aysén and Magallanes regions stay on UTC-3 all year.

Does Brazil have daylight saving time in 2026?

No. Brazil ended daylight saving time in 2019, and the federal government decided not to reinstate it for the 2026 to 2027 summer. São Paulo and Florianópolis stay on UTC-3 all year.

Are Buenos Aires, São Paulo, and Montevideo on the same clock?

Yes. Buenos Aires, São Paulo, and Montevideo all use UTC-3 all year, so they show the same local time. Santiago joins them from early September to early April.

Can a West Coast team run daily standups with engineers in Argentina?

Yes. Buenos Aires and Córdoba share 3 hours with a Pacific workday from November to March, from 9 a.m. to 12 p.m. PT, and 4 hours from March to November. A standup early in the Pacific morning fits inside both workdays.

How much overlap do Colombia and Peru have with US Central time?

Bogotá, Medellín, and Lima share 7 hours with US Central time from November to March, from 9 a.m. to 4 p.m. CT. From March to November they share the full 8-hour day.

Which LatAm cities work for a US team split across both coasts?

Mexico City, Guadalajara, Bogotá, Medellín, and Lima keep at least 5 shared hours with both US Eastern and US Pacific time in every season. That makes them the simplest base for a team with leads in New York and San Francisco.

Is Uruguay on the same time as Argentina?

Yes. Uruguay dropped daylight saving time in 2015 and stays on UTC-3, the same offset Argentina uses all year.

When do US clocks change in 2027?

US daylight saving time starts at 2 a.m. local time on March 14, 2027, and ends at 2 a.m. on November 7, 2027. The rule is the second Sunday of March to the first Sunday of November.

How is working-hour overlap calculated?

Convert both workdays to UTC and count the hours where they overlap. This guide uses 9 a.m. to 5 p.m. on both sides, does not subtract lunch, and does not account for public holidays.

Sources

• National Institute of Standards and Technology, Daylight Saving Time Rules, updated 2026.
• Orden Jurídico Nacional (Government of Mexico), Ley de los Husos Horarios en los Estados Unidos Mexicanos, 2022.
• CNN Chile, Cambio de hora en Chile: ¿Se adelantan o atrasan los relojes? (quotes the text of Decree 98), 2026.
• Radio Agricultura, Cambio de hora en Chile 2026: cuándo se deben adelantar los relojes, 2026.
• Jornal do Brasil, Horário de verão não volta em 2026: governo conclui que não vai mudar o relógio neste verão (quotes Ministry of Mines and Energy and Decree 9,772), 2026.
• timeanddate.com, No Clock Change in Uruguay This Year, 2015.
• Internet Assigned Numbers Authority, Time Zone Database, release 2026f.
• Microsoft, New Microsoft study reveals the rise of the infinite workday, 2025.
• Stack Overflow, 2025 Developer Survey: Work, 2025.
• Howdy, U.S. Survey Finds 73% of Tech Workers Have International Coworkers, 2024, updated 2026.
• Howdy, City Guides, 2026.
• Howdy, LatAm vs Eastern Europe vs Asia: Where Time Zones Actually Overlap With US Teams, 2026.
• Howdy, Software Developer Population in Latin America: Country-by-Country Data, 2026.