Time difference: London and Thunder Bay

Thunder Bay is 5 hours behind London.

Thunder Bay is 5 hours behind London. London is UTC+1. Thunder Bay is UTC-4.

London on 15 October 2026: sunrise 07:24, sunset 18:07, day length 10 h 43 min.

Thunder Bay on 15 October 2026: sunrise 08:16, sunset 19:07, day length 10 h 51 min.

For London and Thunder Bay: The next clock change in London is 1 hour back on 25 October 2026 at 02:00, from UTC+1 to UTC+0.

For Thunder Bay and London: The next clock change in Thunder Bay is 1 hour back on 1 November 2026 at 02:00, from UTC-4 to UTC-5.

When the difference changes
Change
The gap changes on 25 October 2026 at 02:00, when clocks in London move back 1 hour.
The gap changes on 1 November 2026 at 02:00, when clocks in Thunder Bay move back 1 hour.
The gap changes on 14 March 2027 at 02:00, when clocks in Thunder Bay move forward 1 hour.
The gap changes on 28 March 2027 at 01:00, when clocks in London move forward 1 hour.
The gap changes on 31 October 2027 at 02:00, when clocks in London move back 1 hour.

Working hours from each side
View	09:00 to 17:00
From London	London 14:00 to 17:00; Thunder Bay 09:00 to 12:00
From Thunder Bay	Thunder Bay 09:00 to 12:00; London 14:00 to 17:00

Sun this year
City	Longest day	Shortest day
London with Thunder Bay	21 June 2026, 16 h 38 min	21 December 2026, 7 h 50 min
Thunder Bay with London	21 June 2026, 16 h 6 min	21 December 2026, 8 h 19 min