Time in London, Ontario, Canada
Tuesday, November 3, 2026
When London, Ontario changes its clocks
London, Ontario is one of the places that still shifts its clocks twice a year
London, Ontario keeps Eastern Standard Time at UTC-05:00 for most of the year, and moves to Eastern Daylight Time at UTC-04:00 during its summer. The shift is 1 hour.
Next change
14 March 2027 — clocks move forward by 1 hour, from UTC-05:00 to UTC-04:00.
Upcoming transition dates
- 8 March 2026 — forward to UTC-04:00
- 1 November 2026 — back to UTC-05:00
- 14 March 2027 — forward to UTC-04:00
- 7 November 2027 — back to UTC-05:00
- 12 March 2028 — forward to UTC-04:00
- 5 November 2028 — back to UTC-05:00
When the gap to London, Ontario changes
Dates in the next year where the difference shifts, by counterpart city
The difference between two cities is not a constant. It changes whenever either side moves its clocks — and because regions switch on different dates, there are short windows each year when the usual gap is wrong. These are the dates that matter for London, Ontario:
London (United Kingdom)
- From 14 March 2027: London, Ontario is 4 hours behind London
- From 28 March 2027: London, Ontario is 5 hours behind London
- From 31 October 2027: London, Ontario is 4 hours behind London
Frankfurt (Germany)
- From 14 March 2027: London, Ontario is 5 hours behind Frankfurt
- From 28 March 2027: London, Ontario is 6 hours behind Frankfurt
- From 31 October 2027: London, Ontario is 5 hours behind Frankfurt
Tokyo (Japan)
- From 14 March 2027: London, Ontario is 13 hours behind Tokyo
Daylight and the sun over London, Ontario
London, Ontario sits at 42.98°, -81.23°
Longest day
15h 22m of daylight
Shortest day
9h of daylight
Yearly swing
6h 21m between them
That is a swing of 6h 21m between midsummer and midwinter — a large seasonal difference. In practice it means an afternoon call with London, Ontario lands in broad daylight in June and well after dark in December, even though the clock time has not moved.
Clock time versus solar time
When the clock in London, Ontario reads 12:00, the sun is not yet overhead — the civil clock runs 25 minutes ahead of mean solar time here.
During summer time that gap widens to 1 hour 25 minutes ahead of the sun, which is the whole point of the exercise — shifting daylight into the evening.
How London, Ontario's clock got here
Read from the IANA Time Zone Database, the same rules Linux, macOS and Android use
When the clocks change here
Clocks go forward on the second Sunday in March, a rule the tzdb has applied since 2007.
It has changed several times:
- 1987from last Sunday in April to first Sunday in April
- 2007from first Sunday in April to second Sunday in March
Before any of this, London, Ontario kept local mean time — solar noon by definition — at UTC-5:18, until 1895. Standard time zones were an attempt to replace that with something people could agree on, and the London, Ontario clock still carries the residue of that original figure.
Every date above is a record in the IANA Time Zone Database, not an estimate. The database is maintained by volunteers who track official announcements; if a government changes its rules, these figures change with it.
Quick Time Comparisons
See how London, Ontario time compares to other major cities right now
Time Zone Offset from London, Ontario
Best Times to Contact London, Ontario
Optimal calling and meeting hours
Business Hours
Typically 9:00 AM - 5:00 PM local time
Best for professional calls, meetings, and business inquiries
Personal Calls
Evenings 7:00 PM - 10:00 PM local time
Ideal for catching up with family and friends
Pro Tip: Use the meeting coordinator tool above to find overlapping working hours between your location and London, Ontario. This makes scheduling international meetings much easier!
Cultural Business Context
London, Ontario, Canada • 07:06 local time
Consider Timing
Outside business hours
Quick Stats
Business Hours Timeline
Best Times to Contact
Times to Avoid
Business hours: 09:00 - 17:00 | Weekend: Sunday, Saturday | Lunch: 12:00 - 13:00
🌍 Cultural awareness enhances business relationships and prevents scheduling conflicts across global teams
Places related to London, Ontario
Cities that share a clock, a country, or an offset
On exactly the same clock as London, Ontario
These share the America/Toronto zone, so they keep the same time as London, Ontario and change their clocks on the same dates.
Elsewhere in Canada
Canada spans more than one time zone, so these cities are not on London, Ontario's clock — a common source of scheduling errors when people pick a country rather than a city.
Same offset (UTC-05:00), different part of the world
These sit in other countries but keep the same standard offset as London, Ontario (Eastern Standard Time). They will not necessarily change clocks on the same dates, so the match can be seasonal rather than permanent.
Meeting Time Coordinator
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Common Questions About London, Ontario Time
Frequently asked questions
What time zone is London, Ontario in?
London, Ontario operates in the America/Toronto time zone, known as Eastern Standard Time, currently UTC-05:00 (UTC-04:00 during summer time). This clock applies that offset directly from the IANA time zone database.
Does London, Ontario observe daylight saving time?
Yes. London, Ontario shifts its clocks by 1 hour, between UTC-05:00 and UTC-04:00. The next change is on 14 March 2027.
What's the time difference between London, Ontario and my location?
The time comparison tool above shows the current time difference. You can also use our meeting coordinator to find the best times for calls across different time zones.
How accurate is this London, Ontario clock?
Our clock synchronizes with your device's time and applies the official America/Toronto time zone offset. It updates every second and automatically handles daylight saving time, ensuring accuracy within a second.
Can I use this for scheduling meetings in London, Ontario?
Yes! This tool is perfect for scheduling. Use the meeting coordinator above to compare multiple time zones and find optimal meeting times that work for everyone in London, Ontario and other locations.
Time Zone Facts About London, Ontario
Interesting information about London, Ontario's time
IANA identifier
America/Toronto
Standard time name
Eastern Standard Time
Standard offset
UTC-05:00
Daylight saving
Observed — clocks shift 1 hour to UTC-04:00
Region
North America