When it is 09:00 in Mexico City it is 12:00 in Buenos Aires in January and 12:00 in July. Buenos Aires is 3 hours ahead Mexico City right now — and the difference is the same all year. This page gives the live times in both cities, the overlap between their working days, the daylight saving dates that move the difference, and the best meeting windows.
Try the tool: Time Zone Converter — convert any time between Mexico City and Buenos Aires, with the offset for the date you pick.
Live times in Mexico City and Buenos Aires
The two cities side by side. The January column uses the winter offsets (Mexico City UTC−06:00, Buenos Aires UTC−03:00); the July column uses the summer offsets (Mexico City UTC−06:00, Buenos Aires UTC−03:00).
| Time in Mexico City | Buenos Aires in January | Buenos Aires in July |
|---|---|---|
| 00:00 | 03:00 | 03:00 |
| 06:00 | 09:00 | 09:00 |
| 09:00 | 12:00 | 12:00 |
| 12:00 | 15:00 | 15:00 |
| 15:00 | 18:00 | 18:00 |
| 17:00 | 20:00 | 20:00 |
| 21:00 | 00:00 | 00:00 |
The world clock shows the current time in both cities live, and the individual city pages — time in Mexico City and time in Buenos Aires — explain each city's time zone, offsets and daylight saving in full.
The time difference between Mexico City and Buenos Aires
The difference is constant: Buenos Aires is 3 hours ahead Mexico City on every day of the year. That is the simplest case in time-zone work — the answer does not depend on the date, and a meeting set for 09:00 in Mexico City is always 12:00 in Buenos Aires. The reason the difference never changes is that neither city observes daylight saving.
To convert a time, add the difference: 09:00 in Mexico City is 12:00 in Buenos Aires in January and 12:00 in July; 17:00 in Mexico City — the end of the working day — is 20:00 in Buenos Aires in January and 20:00 in July. To go the other way, subtract it: 09:00 in Buenos Aires is 06:00 in Mexico City in January. The time difference calculator does the arithmetic for any date, and the UTC to Buenos Aires page gives the full conversion table for Buenos Aires.
Meeting overlap between Mexico City and Buenos Aires
The overlap is the hours when both cities are in their working day (09:00–17:00 local time). The table marks the overlapping hours in Mexico City's working day and shows what time they are in Buenos Aires.
January
| Mexico City time | Buenos Aires time | Both working? |
|---|---|---|
| 09:00 | 12:00 | No |
| 10:00 | 13:00 | No |
| 11:00 | 14:00 | No |
| 12:00 | 15:00 | No |
| 13:00 | 16:00 | No |
| 14:00 | 17:00 | No |
| 15:00 | 18:00 | No |
| 16:00 | 19:00 | No |
In January the overlap is 0 hours: there is no hour when both cities are in their working day. In July it is 0 hours: there is no hour when both cities are in their working day. The two working days do not overlap at all — the difference is too large. The only options are to meet at the edge of the day, to rotate the awkward hour, or to record the meeting.
Daylight saving in Mexico City and Buenos Aires
Mexico City does not observe daylight saving, so its offset of UTC−06:00 never changes.
Buenos Aires does not observe daylight saving, so its offset of UTC−03:00 never changes.
The difference never changes, so there is no date on which a standing meeting moves. That does not mean the difference is the same as the difference with a third city — the difference between Mexico City and London, for example, may still move when London changes its clocks. The individual DST pages — Mexico City DST 2026 and Buenos Aires DST 2026 — give the exact dates for each city.
Best meeting windows
There is no window inside both working days, in January or in July. The least-bad options are the edges: 08:00 in Mexico City is 11:00 in Buenos Aires in January — before the working day in Mexico City but a reasonable evening in Buenos Aires — and 17:00 in Mexico City is 20:00 in Buenos Aires, which is the morning in Buenos Aires the next day if the difference is large. Rotate the early start between the two sides, week by week, so the same people are not always the ones getting up early.
Calling and travel notes
When it is 09:00 in Mexico City it is 12:00 in Buenos Aires in January; when it is 12:00 in Mexico City it is 15:00 in Buenos Aires; when it is 17:00 in Mexico City it is 20:00 in Buenos Aires. The difference is under 12 hours, so the two cities are usually on the same date — but check the date for late-evening and early-morning times, when the date can differ by a day. Scheduling inside the Americas is usually straightforward: the difference between Mexico City and Buenos Aires is small, and the working days overlap for most of the day. The main thing to check is daylight saving — not every place in the Americas observes it, and the ones that do change on different dates (the United States and Canada in March and November, Chile in September and April, Mexico not at all since 2022).
Worked conversions
Six conversions, for January (offsets Mexico City UTC−06:00, Buenos Aires UTC−03:00):
| Mexico City | Buenos Aires |
|---|---|
| 08:00 | 11:00 |
| 09:00 | 12:00 |
| 12:00 | 15:00 |
| 14:00 | 17:00 |
| 17:00 | 20:00 |
| 20:00 | 23:00 |
In July, the answers are the same. For the reverse direction, see Buenos Aires to Mexico City time.
Mexico City and Buenos Aires at a glance
| Fact | Mexico City | Buenos Aires |
|---|---|---|
| Country | Mexico | Argentina |
| Region | Americas | Americas |
| IANA time zone | America/Mexico_City |
America/Argentina/Buenos_Aires |
| Standard offset | UTC−06:00 | UTC−03:00 |
| Daylight saving offset | — does not observe | — does not observe |
| Offset in January 2026 | UTC−06:00 | UTC−03:00 |
| Offset in July 2026 | UTC−06:00 | UTC−03:00 |
| Observes daylight saving | No | No |
The table is the whole pair in one place. The two numbers that matter most are the January and July offsets: if they are the same in both columns for a city, that city's offset never changes; if they differ, the city observes daylight saving and the difference between the cities moves with it. The individual city pages — time in Mexico City and time in Buenos Aires — explain each city's time zone, and the DST pages — Mexico City DST 2026 and Buenos Aires DST 2026 — give the exact change dates.
Frequently asked questions
What is the time difference between Mexico City and Buenos Aires?
Buenos Aires is 3 hours ahead Mexico City right now. In January the difference is 3 hours ahead and in July it is 3 hours ahead — it is the same all year.
How do I schedule a recurring meeting between Mexico City and Buenos Aires?
Pick a time inside the overlap — the edge of the day, since there is no overlap — and set the calendar event in UTC so it moves correctly when the clocks change. Re-check the overlap in March and October, when the difference moves, and rotate the time if the meeting falls outside someone's working day.
What time is it in Buenos Aires when it is 09:00 in Mexico City?
It is 12:00 in January and 12:00 in July. The time zone converter gives the answer for any date.
What is the best time for a meeting between Mexico City and Buenos Aires?
There is no hour inside both working days. Meet at the edge of the day — early morning in one city, evening in the other — and rotate the awkward hour.
Does the time difference between Mexico City and Buenos Aires change during the year?
No. The difference is 3 hours ahead all year, because neither city observes daylight saving.
What time is it in Mexico City when it is 09:00 in Buenos Aires?
It is 06:00 in January and 06:00 in July. See Buenos Aires to Mexico City time for the full comparison from Buenos Aires's side.
What are the time zones of Mexico City and Buenos Aires?
Mexico City is in America/Mexico_City (UTC−06:00 standard time) and Buenos Aires is in America/Argentina/Buenos_Aires (UTC−03:00 standard time).
What time is it in Mexico City when it is midnight in Buenos Aires?
It is 21:00 in Mexico City in January and 21:00 in July — the same day, because Mexico City is ahead of Buenos Aires. Midnight conversions are the ones that most often land on the wrong date, so always check the date as well as the time.
Sources
- IANA Time Zone Database, via Node.js Intl (
Intl.DateTimeFormatwithtimeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory. - TimeFlow's own time-zone data (
data/cities.ts,data/dst.ts), computed from the IANA database. - TimeFlow's time zone converter and meeting planner — the live tools behind the numbers on this page.
- Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.