Buenos Aires is 4 hours behind of London right now.
London
Sunday, October 18, 2026
British Summer Time (BST) · UTC+1
Buenos Aires
Saturday, October 17, 2026
Argentina Standard Time (UTC−3) · UTC−3
Convert London to Buenos Aires
London 01:23 = Buenos Aires 21:23
London to Buenos Aires time chart, hour by hour
London
Buenos Aires
00:00
20:00 −1 day
01:00
21:00 −1 day
02:00
22:00 −1 day
03:00
23:00 −1 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
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
Highlighted rows fall within 09:00–18:00 in both places: 5 shared working hours.
Clock changes in London and Buenos Aires
London
British Summer Time (BST)
Next clock change Sun 25 Oct 2026 (UTC+1 → UTC+0)
Buenos Aires
Argentina Standard Time (UTC−3)
No daylight saving time.
Time difference between London and Buenos Aires today
Right now Buenos Aires is 4 hours behind of London. When it is 09:00 in London, it is 05:00 in Buenos Aires. London is on British Summer Time (BST); Buenos Aires is on Argentina Standard Time (UTC−3).
When the London to Buenos Aires time difference changes
For most of the year Buenos Aires is 4 hours behind of London. From 25 October to 31 December 2026, Buenos Aires is 3 hours behind of London instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
Dates
Buenos Aires vs London
Length
29 March 2026 to 24 October 2026
4 hours behind
210 days
25 October 2026 to 31 December 2026
3 hours behind
68 days
1 January 2027 to 27 March 2027
3 hours behind
86 days
28 March 2027 to 30 October 2027
4 hours behind
217 days
31 October 2027 to 31 December 2027
3 hours behind
62 days
Calling hours for London and Buenos Aires
When Buenos Aires is 4 hours behind of London: 4 shared office hours, 13:00 to 17:00 in London (09:00 to 13:00 in Buenos Aires).
When Buenos Aires is 3 hours behind of London: 5 shared office hours, 12:00 to 17:00 in London (09:00 to 14:00 in Buenos Aires).
Frequently asked questions about London and Buenos Aires time
What time is it in Buenos Aires when it is 9:00 AM in London?
05:00 today; Buenos Aires is 4 hours behind of London.
Does the time difference between London and Buenos Aires change?
Yes. It is usually 4 hours behind, but changes when one side moves its clocks: 3 hours behind from 25 October to 31 December 2026; 3 hours behind from 1 January to 27 March 2027.