Tehran
Iran
--:-- --
GMT+3:30 · UTC+3:30 3 hours 30 minutes difference
London
United Kingdom
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GMT · UTC+0 Convert Tehran (GMT+3:30) to London (GMT) Time — 3 hours 30 minutes apart
Asia/Tehran · GMT+3:30 · UTC+3:30 | Europe/London · GMT · UTC+0 · 3 hours 30 minutes difference · 399 cities · DST applies
24-Hour Overlap Timeline
✅ Overlap: 12:00 PM–6:00 PM in Tehran · 9:00 AM–3:00 PM in London (6h window)
⚠ London observes daylight saving time — offset may vary by up to 1 hour seasonally
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UTC → | ||||||||||||||||||||||||
| 🇮🇷 Tehran UTC+3:30 | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p | 12a | 1a | 2a |
| 🇬🇧 London UTC+0 | 12a | 1a | 2a | 3a | 4a | 5a | 6a | 7a | 8a | 9a | 10a | 11a | 12p | 1p | 2p | 3p | 4p | 5p | 6p | 7p | 8p | 9p | 10p | 11p |
Both working Working Off hours Sleeping Now
Key Facts: Tehran (GMT+3:30) vs London (GMT)
Time Gap
3h 30m
Tehran ahead
May vary ±1h (DST)
DST Status
✅ Tehran
No DST
⏰ London: Observes DST
Cities in GMT+3:30
163
Largest: Tehran
14,148,000 pop.
Overlap Window
5h window
1:00 PM – 6:00 PM (GMT+3:30)
9:00 AM – 2:00 PM (GMT)
Find Cities in Tehran & London Timezones
The GMT+3:30 and GMT timezones are separated by 3 hours 30 minutes. Tehran is the largest city in the Asia/Tehran zone and London is the largest in Europe/London. London observes daylight saving time — the difference may change by 1 hour seasonally. For scheduling between these regions, the key fact is: there are 5 hours of mutual business-hours overlap each day.
Best Times to Schedule Calls: Tehran (GMT+3:30) ↔ London (GMT)
| Tehran (GMT+3:30) | London (GMT) | Quality |
|---|---|---|
| 12:00 AM | 8:00 PM prev day | ❌ |
| 1:00 AM | 9:00 PM prev day | ❌ |
| 6:00 AM | 2:00 AM | ❌ |
| 7:00 AM | 3:00 AM | ❌ |
| 8:00 AM | 4:00 AM | ❌ |
| 9:00 AM | 5:00 AM | ❌ |
| 10:00 AM | 6:00 AM | ❌ |
| 11:00 AM | 7:00 AM | ⚠️ |
| 12:00 PM | 8:00 AM | ⚠️ |
| 1:00 PM | 9:00 AM | ✅ |
| 2:00 PM | 10:00 AM | ✅ |
| 3:00 PM | 11:00 AM | ✅ |
| 4:00 PM | 12:00 PM | ✅ |
| 5:00 PM | 1:00 PM | ✅ |
| 6:00 PM | 2:00 PM | ⚠️ |
| 7:00 PM | 3:00 PM | ⚠️ |
| 8:00 PM | 4:00 PM | ❌ |
| 9:00 PM | 5:00 PM | ❌ |
| 10:00 PM | 6:00 PM | ❌ |
| 11:00 PM | 7:00 PM | ❌ |
Work hours defined as 09:00–18:00 local time. ✅ Both in work hours ⚠️ Borderline ❌ Outside work hours.
GMT+3:30 to GMT: Complete 24-Hour Time Conversion Table
| Tehran (GMT+3:30) | London (GMT) | IST (UTC+5:30) |
|---|---|---|
| 12:00 AM | 8:30 PM −1 | 2:00 AM |
| 1:00 AM | 9:30 PM −1 | 3:00 AM |
| 2:00 AM | 10:30 PM −1 | 4:00 AM |
| 3:00 AM | 11:30 PM −1 | 5:00 AM |
| ← Date changes in London → | ||
| 4:00 AM | 12:30 AM | 6:00 AM |
| 5:00 AM | 1:30 AM | 7:00 AM |
| 6:00 AM | 2:30 AM | 8:00 AM |
| 7:00 AM | 3:30 AM | 9:00 AM |
| 8:00 AM | 4:30 AM | 10:00 AM |
| 9:00 AM | 5:30 AM | 11:00 AM |
| 10:00 AM | 6:30 AM | 12:00 PM |
| 11:00 AM | 7:30 AM | 1:00 PM |
| 12:00 PM | 8:30 AM | 2:00 PM |
| 1:00 PM | 9:30 AM | 3:00 PM |
| 2:00 PM | 10:30 AM | 4:00 PM |
| 3:00 PM | 11:30 AM | 5:00 PM |
| 4:00 PM | 12:30 PM | 6:00 PM |
| 5:00 PM | 1:30 PM | 7:00 PM |
| 6:00 PM | 2:30 PM | 8:00 PM |
| 7:00 PM | 3:30 PM | 9:00 PM |
| 8:00 PM | 4:30 PM | 10:00 PM |
| 9:00 PM | 5:30 PM | 11:00 PM |
| 10:00 PM | 6:30 PM | 12:00 AM |
| 11:00 PM | 7:30 PM | 1:00 AM |
IST (India Standard Time, UTC+5:30) shown as reference for Indian users. +1/−1 indicates a different calendar day.
163 Cities in Tehran (GMT+3:30) & 236 Cities in London (GMT) — Page 1 of 2
Tehran & 162 more — Tehran (GMT+3:30, UTC+3:30)
- Tehran, IR 14.1M
- Mashhad, IR 3.7M
- Esfahan, IR 2.2M
- Karaj, IR 2.0M
- Shiraz, IR 1.6M
- Tabriz, IR 1.6M
- Ahvaz, IR 1.3M
- Qom, IR 1.2M
- Kermanshah, IR 947K
- Kerman, IR 738K
- Orumiyeh, IR 736K
- Borvayeh-ye Al Bu `Aziz, IR 690K
- Rasht, IR 680K
- Bahar, IR 673K
- Zahedan, IR 588K
Hamadan, IRYazd, IRArdabil, IRBandar `Abbas, IRArak, IREslamshahr, IRSanandaj, IRQazvin, IRZanjan, IRGorgan, IRShahriar, IRShahr-e Qods, IRKashan, IRMalard, IRMaragheh, IRSarta, IRDezful, IRBabol, IRQa'em Shahr, IRKhomeyni Shahr, IRSabzevar, IRAndimeshk, IRAmol, IRPakdasht, IRNajafabad, IRBorujerd, IRMadan, IRQarchak, IRBojnurd, IRVaramin, IRBandar-e Bushehr, IRNeyshabur, IRSaveh, IRBirjand, IRNasim Shahr, IRKhorramabad, IRKhowy, IRBukan, IRShahr-e Kord, IRSemnan, IRFardis, IRSirjan, IRShahin Shahr, IRMalayer, IRMahabad, IRSaqqez, IRShahrud, IRKhodabandeh, IRBandar-e Mahshahr, IRRafsanjan, IRBorazjan, IRGonbad-e Kavus, IRMarvdasht, IRQuchan, IRJahrom, IRKamalshahr, IRTorbat-e Heydariyeh, IRMarivan, IRShahreza, IRZabol, IRKhorramshahr, IRMarand, IRJiroft, IRSalmas, IRBam, IRBehbahan, IRDorud, IRNazarabad, IRMohammad Shahr, IRBandar-e Anzali, IRIranshahr, IRFasa, IRBaneh, IRYasuj, IRChabahar, IRRobat Karim, IRKashmar, IRShushtar, IRAhar, IRMasjed Soleyman, IRTorbat-e Jam, IRAbhar, IRMianeh, IRDo Gonbadan, IRKazerun, IRBehshahr, IRAlvand, IRPiranshahr, IREslamabad-e Gharb, IRKuhdasht, IRFulad Shahr, IRKhowrasgan, IRTajrish, IRShirvan, IRMeybod, IRTakestan, IRLangarud, IRBumahen, IRBaharestan, IRAligudarz, IRBandar-e Emam Khomeyni, IRBandar Emam, IRQorveh, IRShush, IRNahavand, IRBonab, IRArdakan, IRRamhormoz, IRMeshgin Shahr, IRBandar-e Genaveh, IRNaqadeh, IRKhomeyn, IROmidiyeh, IRAran Bidgol, IRBaqershahr, IRMahdasht, IRMobarakeh, IRMeshkin Dasht, IRNeka, IRKangan, IRAbyek, IRSaravan, IRBabolsar, IREsfarayen, IRDamghan, IRZarand, IRBorujen, IRDehdasht, IRKhash, IRTaybad, IRKut-e `Abdollah, IRZarrin Shahr, IRAsadabad, IRHashtgerd, IRTonekabon, IRKhorramdarreh, IREqbaliyeh, IRJavanrud, IRHashtpar, IRSefrou, MASabbashahr, IRBandar-e Torkaman, IRChenaran, IRBijar, IR`Aliabad-e Katul, IRKahnuj, IRSusangerd, IRTuyserkan, IR
London & 235 more — London (GMT, UTC+0)
- London, GB 11.3M
- Birmingham, GB 2.6M
- Portsmouth, GB 856K
- Southampton, GB 856K
- Bristol, GB 707K
- Glasgow, GB 626K
- Manchester, GB 548K
- Leeds, GB 536K
- Sheffield, GB 518K
- Liverpool, GB 513K
- Edinburgh, GB 488K
- Worthing, GB 474K
- Leicester, GB 464K
- Coventry, GB 363K
- Caerdydd, GB 361K
Belfast, GBReading, GBKingston upon Hull, GBNewcastle, GBStockport, GBBradford, GBNottingham, GBBolton, GBSunderland, GBPlymouth, GBMilton Keynes, GBDerby, GBWestminster, GBWolverhampton, GBAbertawe, GBBarnsley, GBStoke-on-Trent, GBSwindon, GBNorwich, GBLuton, GBSolihull, GBIslington, GBAberdeen, GBPeterborough, GBCroydon, GBBournemouth, GBBasildon, GBSaint Helens, GBIlford, GBWarrington, GBHuddersfield, GBSouthend, GBNewport, GBEnfield, GBIpswich, GBHarrow, GBDundee, GBWest Bromwich, GBGloucester, GBPoole, GBTelford, GBPreston, GBYork, GBMiddlesbrough, GBBlackpool, GBNorthampton, GBBrighton, GBSale, GBLincoln, GBTottenham, GBExeter, GBCambridge, GBRomford, GBColchester, GBHigh Wycombe, GBGateshead, GBSlough, GBBlackburn, GBCheltenham, GBChelmsford, GBRochdale, GBWythenshawe, GBBirkenhead, GBDoncaster, GBRotherham, GBMaidstone, GBWalthamstow, GBOxford, GBBasingstoke, GBCrawley, GBDagenham, GBGillingham, GBHalifax, GBSalford, GBWigan, GBHounslow, GBWembley, GBWorcester, GBEastbourne, GBWakefield, GBOldham, GBSutton Coldfield, GBHammersmith, GBHemel Hempstead, GBBath, GBHayes, GBDarlington, GBWimbledon, GBBedford, GBHove, GBSouthport, GBHastings, GBOrpington, GBWatford, GBStevenage, GBGrimsby, GBHartlepool, GBBromley, GBChester, GBFulham, GBNuneaton, GBDerry, GBEaling, GBWoolwich, GBAylesbury, GBAshford, GBStockton-on-Tees, GBSaint Albans, GBHarlow, GBBurnley, GBRedditch, GBEdmonton, GBBatley, GBScunthorpe, GBDudley, GBBury, GBEastleigh, GBBrixton, GBSouthall, GBPaisley, GBGuildford, GBChatham, GBEast Ham, GBWeston-super-Mare, GBCarlisle, GBSouth Shields, GBEast Kilbride, GBNewcastle under Lyme, GBBurton upon Trent, GBGravesend, GBTamworth, GBHarrogate, GBShrewsbury, GBGosport, GBLisburn, GBRugby, GBStafford, GBChingford, GBUxbridge, GBMansfield, GBRhondda, GBTynemouth, GBCannock, GBWalsall, GBWashington, GBGrays, GBWalton upon Thames, GBFinchley, GBThornton Heath, GBFarnborough, GBLoughborough, GBKensington, GBBoston, GBPaignton, GBWaterlooville, GBGuiseley, GBHornchurch, GBMaidenhead, GBMitcham, GBFeltham, GBStourbridge, GBRochester, GBDewsbury, GBWoking, GBActon, GBTwickenham, GBRuncorn, GBWrecsam, GBWidnes, GBMargate, GBEllesmere Port, GBBangor, GBTaunton, GBWallasey, GBHalesowen, GBBracknell, GBBarking, GBSutton, GBMerthyr Tudful, GBEdgware, GBRuislip, GBStreatham, GBRoyal Tunbridge Wells, GBBebington, GBAldershot, GB
⚠️ Daylight Saving Time Affects This Pair
| Timezone | DST? | Standard | Daylight |
|---|---|---|---|
| Asia/Tehran | No | UTC+3:30 | — |
| Europe/London | Yes | UTC+0 | UTC+1 |
During DST periods the time difference between these zones may be 2 hours 30 minutes instead of 3 hours 30 minutes. Always verify the current offset if scheduling calls near clock-change dates.