TIME ZONE CONVERTER
Tehran to London
Time Converter
Convert Tehran, Iran to London, United Kingdom. Compare dates, seasonal differences and meeting hours.
Tehran is 2h 30m or 3h 30m ahead of London in 2026, depending on the date.
9 AM Tehran = 5:30 AM London
Selected date: November 10, 2026.
THE QUICK REFERENCE
CSVTehran to London conversion table
November 10, 2026 · Date changes are marked.
View the full 24-hour table
| Tehran | London |
|---|---|
| 12:00 AM | 8:30 PM -1 day |
| 1:00 AM | 9:30 PM -1 day |
| 2:00 AM | 10:30 PM -1 day |
| 3:00 AM | 11:30 PM -1 day |
| 4:00 AM | 12:30 AM |
| 5:00 AM | 1:30 AM |
| 6:00 AM | 2:30 AM |
| 7:00 AM | 3:30 AM |
| 8:00 AM | 4:30 AM |
| 9:00 AM | 5:30 AM |
| 10:00 AM | 6:30 AM |
| 11:00 AM | 7:30 AM |
| Tehran | London |
|---|---|
| 12:00 PM | 8:30 AM |
| 1:00 PM | 9:30 AM |
| 2:00 PM | 10:30 AM |
| 3:00 PM | 11:30 AM |
| 4:00 PM | 12:30 PM |
| 5:00 PM | 1:30 PM |
| 6:00 PM | 2:30 PM |
| 7:00 PM | 3:30 PM |
| 8:00 PM | 4:30 PM |
| 9:00 PM | 5:30 PM |
| 10:00 PM | 6:30 PM |
| 11:00 PM | 7:30 PM |
Starting with the London working day
These examples start on 2026-11-10 in London.
09:00 London12:30 →Tehran · 2026-11-10
17:00 London20:30 →Tehran · 2026-11-10
ONE CLOCK TIME. THE WHOLE YEAR.
Year CSV09:00 Tehran to London throughout 2026
Keeping 09:00 on the Tehran clock produces 2 different destination clock/date answers in 2026. The ranges below use Tehran calendar dates, including transition days.
| Dates in Tehran · 2026 | London answer | Source → destination offsets | Explore |
|---|---|---|---|
| Jan 1 – Mar 2887 dates | 05:30Same date | UTC+03:30 → UTC | |
| Mar 29 – Oct 24210 dates | 06:30Same date | UTC+03:30 → UTC+01:00 | |
| Oct 25 – Dec 3168 dates | 05:30Same date | UTC+03:30 → UTC |
Every calendar date is included, not just workdays. Date ranges include both endpoints. Based on IANA 2026e; future rules may change.
DON’T LOSE A DAY
When does Tehran time become a different date in London?
Your complete source day: 2026-11-10. Each range shows which destination date to use.
Tehran · 2026-11-1000:00–03:30UTC+03:30
London · 2026-11-0920:30–24:00UTC Previous day
Tehran · 2026-11-1003:30–24:00UTC+03:30
London · 2026-11-1000:00–20:30UTC Same date
Range starts are included; ends are excluded. 24:00 means midnight at the end of that date. Repeated hours appear separately with their UTC offsets. The strip is proportional to elapsed time.
THE BIGGER PICTURE
2026A year of time differences.
How London compares with Tehran throughout 2026.
JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
−3h 30m
−2h 30m
−3h 30m
London changes its UTC offset in 2026. Tehran keeps one UTC offset this year.
See exact change periods
| From (UTC, inclusive) | Until (UTC, exclusive) | London vs Tehran |
|---|---|---|
| 1 Jan 2026, 00:00 UTC | 29 Mar 2026, 01:00 UTC | 3h 30m behind |
| 29 Mar 2026, 01:00 UTC | 25 Oct 2026, 01:00 UTC | 2h 30m behind |
| 25 Oct 2026, 01:00 UTC | 1 Jan 2027, 00:00 UTC | 3h 30m behind |
CLOCK CHANGES
What changes at the next clock adjustment?
Exact periods outside the most common difference in 2026
The most frequent difference has London 2h 30m behind relative to Tehran. Exceptions:
| From (UTC, inclusive) | Until (UTC, exclusive) | Compared with Tehran |
|---|---|---|
| 1 Jan 2026, 00:00 UTC | 29 Mar 2026, 01:00 UTC | 3h 30m behind |
| 25 Oct 2026, 01:00 UTC | 1 Jan 2027, 00:00 UTC | 3h 30m behind |
PLAN BEYOND A SINGLE DAY
Daily CSVTehran–London working hours through 2026
Every date calculated with your working windows. 261 selected Tehran workdays; public holidays are not applied.
Least shared time4h 30m
Most common5h 30m
Most shared time5h 30m
Days without a 60-min slot0 / 261
A start time that survives the whole year.
Start a 60-minute meeting in Tehran 12:30–16:00.
These starts fit both working windows on every selected Tehran workday in 2026, using a 15-minute start grid. The end of each range is the last valid start.
Tehran: 09:00–17:00, Mon, Tue, Wed, Thu, Fri. London: 09:00–17:00, Mon, Tue, Wed, Thu, Fri.
Calculation details and repeated hours
Overnight shifts belong to their start weekday. Host workday means the source calendar date. Repeated local times use the first occurrence.
TWO PLACES. ONE CONNECTION.
≈ 4,398 km apartAcross the map. Across the clock.
THE DETAILS THAT MATTER
Tehran to London: useful answers
Why is the Tehran to London difference sometimes 2h 30m and sometimes 3h 30m?
Tehran is 2h 30m or 3h 30m ahead of London in 2026, depending on the date. London changes its UTC offset in 2026. Tehran keeps one UTC offset this year.
Does the Tehran–London time difference change in 2026?
The published rules produce 3 periods with 2 different offsets in 2026. See the annual chart for the exact boundaries of each period.
Does this conversion change the calendar date?
09:00 in Tehran on 2026-11-10 is 05:30 in London on 2026-11-10. This selected time stays on the same date in both places. Other times can cross midnight.
Can Tehran and London meet during working hours?
Your selected working windows share 4h 30m on 2026-11-10. The planner above checks the whole meeting duration and shows suitable start times. Edit the windows to match your team.
Related time-zone meanings and conversions
Choose the question you need answered
Calculated with IANA 2026e. Working hours are your preferences; public holidays and calendar availability are not included. Our methodology