Tehran is 3 hours 30 minutes ahead UTC in winter and 3 hours 30 minutes ahead UTC in summer — 3.5 hours ahead of UTC in winter. Its standard offset is UTC+03:30, and it does not observe daylight saving, so the difference never changes. This page explains the difference, shows it month by month, and gives the conversion tables in both directions.
Try the tool: UTC Converter — convert any time between UTC and Tehran, with the offset for the date you pick.
How far is Tehran from UTC?
The difference between Tehran and UTC is the offset: UTC+03:30 in standard time. When it is noon in Tehran, it is still morning in London — the day in Tehran is 3 hours 30 minutes ahead the day at Greenwich. The sign matters: a positive offset means ahead of UTC (east of Greenwich), a negative offset means behind it (west of Greenwich).
In practical terms, the difference means that the working day in Tehran (09:00–17:00 local) is 05:30–13:30 UTC in January and 05:30–13:30 UTC in July. A team that schedules in UTC needs to know both numbers, because a meeting set for 15:00 UTC is 18:30 in Tehran in January and 18:30 in July — and one of those may be outside the working day even when the other is inside it.
Tehran vs UTC through the year
The offset on the 15th of each month in 2026. If the table shows one value all year, Tehran does not observe daylight saving. If it shows two values, the change between them is the clock change.
| Month | Offset from UTC |
|---|---|
| January | UTC+03:30 |
| February | UTC+03:30 |
| March | UTC+03:30 |
| April | UTC+03:30 |
| May | UTC+03:30 |
| June | UTC+03:30 |
| July | UTC+03:30 |
| August | UTC+03:30 |
| September | UTC+03:30 |
| October | UTC+03:30 |
| November | UTC+03:30 |
| December | UTC+03:30 |
The clock changes are: in 2026, none; in 2027, none. For the full story, see the Tehran DST 2026 page and the daylight saving checker.
Conversion tables
UTC to Tehran, for eight hours of the day:
| UTC | Tehran (January) | Tehran (July) |
|---|---|---|
| 00:00 | 03:30 | 03:30 |
| 03:00 | 06:30 | 06:30 |
| 06:00 | 09:30 | 09:30 |
| 09:00 | 12:30 | 12:30 |
| 12:00 | 15:30 | 15:30 |
| 15:00 | 18:30 | 18:30 |
| 18:00 | 21:30 | 21:30 |
| 21:00 | 00:30 | 00:30 |
Tehran to UTC, for the same eight hours:
| Tehran local | UTC (January) | UTC (July) |
|---|---|---|
| 00:00 | 20:30 | 20:30 |
| 03:00 | 23:30 | 23:30 |
| 06:00 | 02:30 | 02:30 |
| 09:00 | 05:30 | 05:30 |
| 12:00 | 08:30 | 08:30 |
| 15:00 | 11:30 | 11:30 |
| 18:00 | 14:30 | 14:30 |
| 21:00 | 17:30 | 17:30 |
Two things to watch in these tables. First, the date: a UTC time in the evening is the next day in Tehran when the offset is positive — 21:00 UTC is 00:30 the next day in Tehran in January — and a Tehran time early in the morning is the previous day in UTC when the offset is positive. Second, the season: the January and July columns are identical, because the offset never changes. The UTC to Tehran page has the full 24-hour table.
Daylight saving and the difference
Tehran does not observe daylight saving, so the difference from UTC is constant: UTC+03:30 on every day of the year. Iran abolished daylight saving in 2022. It stays on UTC+3:30 all year — one of the world's few half-hour zones. That constancy is an advantage for scheduling — the difference never moves — but it also means the difference between Tehran and any place that does observe daylight saving moves twice a year, when the other place changes its clocks. The difference between Tehran and New York, for example, is 8 hours 30 minutes ahead in January and 7 hours 30 minutes ahead in July.
What the difference means for scheduling
For a team that works in UTC — software, aviation, science — the difference is the number you add to every UTC time to get Tehran time, and the number you subtract from every Tehran time to get UTC. The mistake is to use one number all year when there are two. The safe habit is to put the UTC time in every invitation as well as the local time, and to let the calendar do the conversion: a calendar event set in UTC moves correctly when daylight saving changes, and an event set in local time does not always.
For comparison, two other major cities: London is the same time UTC in January and 1 hour ahead UTC in July, and Tokyo is 9 hours ahead UTC all year. Tehran's difference of 3 hours 30 minutes ahead (January) sits between them in the sense that matters for scheduling: a meeting at 14:00 UTC is 17:30 in Tehran, 14:00 in London and 23:00 in Tokyo in January. The time in Tehran page has the working-hours tables, and the meeting planner finds the overlap for any pair of cities.
Tehran vs UTC: the numbers at a glance
| Fact | Value |
|---|---|
| Standard offset | UTC+03:30 |
| Daylight saving offset | — does not observe daylight saving |
| Offset in January 2026 | UTC+03:30 |
| Offset in July 2026 | UTC+03:30 |
| Difference from UTC in January | 3 hours 30 minutes ahead |
| Difference from UTC in July | 3 hours 30 minutes ahead |
| IANA time zone | Asia/Tehran |
| Country | Iran |
Adjusting to the difference — travel and jet lag
Travelling to Tehran from London means setting your watch forward by 3.5 hours in January — you lose time going east, and the first day feels short. Travelling the other way, from Tehran to London, you gain the hours back. The rule of thumb for jet lag is that it takes about a day to adjust for each hour of difference when travelling east, and a little less when travelling west — so a trip from London to Tehran in January takes most travellers about 4 days to fully adjust to, while the return trip is usually easier. The practical advice is the same in both directions: get sunlight in the morning at your destination, avoid naps longer than 20 minutes, and do not schedule important meetings for the first morning after you arrive.
The same arithmetic applies to remote work. If you are in Tehran and your team works in UTC, your working day of 09:00–17:00 local time is 05:30–13:30 UTC in January — so a stand-up at 09:00 UTC is 12:30 for you, and a stand-up at 16:00 UTC is 19:30. If those times are outside your working day, the meeting is in the wrong place in the day, and the fix is to move the UTC time, not to ask one person to work at midnight. The meeting time finder finds the hours that work for a whole team, and the time in Tehran page has the working-hours tables.
Frequently asked questions
How many hours is Tehran ahead of UTC?
Tehran is 3 hours 30 minutes ahead UTC in January and 3 hours 30 minutes ahead UTC in July. The difference is the same all year.
Is Tehran ahead of or behind UTC?
Tehran is ahead of UTC — its offset is positive (UTC+03:30 in January), so local time is later than UTC.
Does the time difference between Tehran and UTC change?
No. Tehran does not observe daylight saving, so the difference of 3 hours 30 minutes ahead never changes.
What is Tehran's UTC offset?
Tehran's standard offset is UTC+03:30, all year. Its IANA time zone is Asia/Tehran.
When it is midnight UTC, what time is it in Tehran?
It is 03:30 in January and 03:30 in July — the same day, because the offset is positive.
Sources
- IANA Time Zone Database, via Node.js Intl (
Intl.DateTimeFormatwithtimeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory. - TimeFlow's own time-zone data (
data/cities.ts,data/dst.ts), computed from the IANA database. - TimeFlow's UTC converter and world clock — the live tools behind the numbers on this page.
- Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.