Time Difference Between London and Argentina
As of 31 August 2026, Argentina is 4 hours behind London. That number is not constant. Over the course of a year, because of daylight saving changes, Buenos Aires, Argentina ranges from 4 hours behind to 3 hours behind relative to London, United Kingdom. The calculator below is always up to date.
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London, United Kingdom
23:34
Mon, Aug 31, 2026
UTC+1 · Europe/London
Buenos Aires, Argentina
-4h19:34
Mon, Aug 31, 2026
UTC-3 · America/Argentina/Buenos_Aires
Argentina is 4 hours behind London.
Time zone details
| Place | Local date | Time zone | UTC offset | Summer time |
|---|---|---|---|---|
| London | Monday, August 31, 2026 | Europe/London | UTC+1 | Active now |
| Argentina | Monday, August 31, 2026 | America/Argentina/Buenos_Aires | UTC-3 | Not observed |
Hour by hour: London to Argentina
Every hour of today in London and what it is in Argentina. Highlighted rows fall inside Argentina working hours (09:00–18:00).
| London | Argentina |
|---|---|
| 00:00 | 20:00prev day |
| 01:00 | 21:00prev day |
| 02:00 | 22:00prev day |
| 03:00 | 23:00prev day |
| 04:00 | 00:00 |
| 05:00 | 01:00 |
| 06:00 | 02:00 |
| 07:00 | 03:00 |
| 08:00 | 04:00 |
| 09:00 | 05:00 |
| 10:00 | 06:00 |
| 11:00 | 07:00 |
| London | Argentina |
|---|---|
| 12:00 | 08:00 |
| 13:00 | 09:00 |
| 14:00 | 10:00 |
| 15:00 | 11:00 |
| 16:00 | 12:00 |
| 17:00 | 13:00 |
| 18:00 | 14:00 |
| 19:00 | 15:00 |
| 20:00 | 16:00 |
| 21:00 | 17:00 |
| 22:00 | 18:00 |
| 23:00 | 19:00 |
Best time to call or meet
Overlapping working hours
13:00–18:00 in London (09:00–14:00 in Argentina)
Both places are inside 09:00–18:00 for 5 hours a day. Anything in this window works without asking anyone to stay late.
Reasonable calling hours
12:00–21:00 in London (08:00–17:00 in Argentina)
Both people are awake and available between 08:00 and 21:00 local time during this window.
When this difference changes
London puts its clocks back on Sunday, October 25, 2026
The local offset moves from UTC+1 to UTC. After that date, Argentina is 3 hours behind London — instead of 4 hours behind, as it is today.
Planning something with more than two places?
Adding a third city usually kills the obvious answer. The Meeting Time Finder takes up to five cities at once and shows only the hours that work for everybody.
London and Argentina: common questions
What is the time difference between London and Argentina?
As of 31 August 2026, Argentina is 4 hours behind London. The gap is not fixed: across the year, Argentina ranges from 4 hours behind to 3 hours behind relative to London, as clocks change. The calculator on this page always shows the difference for right now.
When it is 9:00 AM in London, what time is it in Argentina?
It is 05:00 AM in Buenos Aires, Argentina. Use the time field in the calculator above to check any other hour.
Is Argentina ahead of or behind London?
Argentina is behind London by 4 hours at the moment. In practical terms, the working day in Argentina starts and ends later in London terms.
Do London and Argentina observe daylight saving time?
London changes its clocks twice a year; Argentina does not. The difference therefore shifts by an hour when London switches: across the year, Argentina ranges from 4 hours behind to 3 hours behind relative to London.
What is the best time to call Argentina from London?
Working hours overlap between 13:00 and 18:00 London time, which is 09:00 to 14:00 in Argentina. Calls inside that window reach both sides during the normal working day.
Related comparisons
Local dates shown for London, United Kingdom (UTC+1) and Buenos Aires, Argentina (UTC-3) were generated on Monday, August 31, 2026 UTC and refresh in your browser.