Havana
Cuba
--:-- --
GMT-5 · UTC-5
8 hours 30 minutes difference
Tehran
Iran
--:-- --
GMT+3:30 · UTC+3:30

24-Hour Overlap Timeline

✅ Overlap: 9:00 AM–10:00 AM in Havana · 5:00 PM–6:00 PM in Tehran (1h window)

⚠ Havana observes daylight saving time — offset may vary by up to 1 hour seasonally

01234567891011121314151617181920212223
UTC →
🇨🇺 Havana UTC-5 7p 8p 9p 10p 11p 12a 1a 2a 3a 4a 5a 6a 7a 8a 9a 10a 11a 12p 1p 2p 3p 4p 5p 6p
🇮🇷 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
Both working Working Off hours Sleeping Now

Key Facts: Havana (GMT-5) vs Tehran (GMT+3:30)

Time Gap
8h 30m
Tehran ahead
May vary ±1h (DST)
DST Status
⏰ Havana
Observes DST
✅ Tehran: No DST
Cities in GMT-5
52
Largest: Havana
2,089,532 pop.
Overlap Window
1h window
9:00 AM – 10:00 AM (GMT-5)
5:00 PM – 6:00 PM (GMT+3:30)

Find Cities in Havana & Tehran Timezones

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The GMT-5 and GMT+3:30 timezones are separated by 8 hours 30 minutes. Havana is the largest city in the America/Havana zone and Tehran is the largest in Asia/Tehran. Havana observes daylight saving time — the difference may change by 1 hour seasonally. For scheduling between these regions, the key fact is: there are only 1 hour of mutual business-hours overlap.

Best Times to Schedule Calls: Havana (GMT-5) ↔ Tehran (GMT+3:30)

Havana (GMT-5) Tehran (GMT+3:30) Quality
12:00 AM 8:00 AM
1:00 AM 9:00 AM
2:00 AM 10:00 AM
3:00 AM 11:00 AM
4:00 AM 12:00 PM
5:00 AM 1:00 PM
6:00 AM 2:00 PM
7:00 AM 3:00 PM ⚠️
8:00 AM 4:00 PM ⚠️
9:00 AM 5:00 PM
10:00 AM 6:00 PM ⚠️
11:00 AM 7:00 PM ⚠️
12:00 PM 8:00 PM
1:00 PM 9:00 PM
2:00 PM 10:00 PM
3:00 PM 11:00 PM
4:00 PM 12:00 AM +1 day
5:00 PM 1:00 AM +1 day
6:00 PM 2:00 AM +1 day
7:00 PM 3:00 AM +1 day
8:00 PM 4:00 AM +1 day
9:00 PM 5:00 AM +1 day
10:00 PM 6:00 AM +1 day
11:00 PM 7:00 AM +1 day

Work hours defined as 09:00–18:00 local time. ✅ Both in work hours  ⚠️ Borderline  ❌ Outside work hours.

GMT-5 to GMT+3:30: Complete 24-Hour Time Conversion Table

Havana (GMT-5) Tehran (GMT+3:30) IST (UTC+5:30)
12:00 AM 8:30 AM 10:30 AM
1:00 AM 9:30 AM 11:30 AM
2:00 AM 10:30 AM 12:30 PM
3:00 AM 11:30 AM 1:30 PM
4:00 AM 12:30 PM 2:30 PM
5:00 AM 1:30 PM 3:30 PM
6:00 AM 2:30 PM 4:30 PM
7:00 AM 3:30 PM 5:30 PM
8:00 AM 4:30 PM 6:30 PM
9:00 AM 5:30 PM 7:30 PM
10:00 AM 6:30 PM 8:30 PM
11:00 AM 7:30 PM 9:30 PM
12:00 PM 8:30 PM 10:30 PM
1:00 PM 9:30 PM 11:30 PM
2:00 PM 10:30 PM 12:30 AM
3:00 PM 11:30 PM 1:30 AM
← Date changes in Tehran →
4:00 PM 12:30 AM +1 2:30 AM
5:00 PM 1:30 AM +1 3:30 AM
6:00 PM 2:30 AM +1 4:30 AM
7:00 PM 3:30 AM +1 5:30 AM
8:00 PM 4:30 AM +1 6:30 AM
9:00 PM 5:30 AM +1 7:30 AM
10:00 PM 6:30 AM +1 8:30 AM
11:00 PM 7:30 AM +1 9:30 AM

IST (India Standard Time, UTC+5:30) shown as reference for Indian users. +1/−1 indicates a different calendar day.

52 Cities in Havana (GMT-5) & 163 Cities in Tehran (GMT+3:30)

Tehran & 162 more — Tehran (GMT+3:30, UTC+3:30)

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

⚠️ Daylight Saving Time Affects This Pair

TimezoneDST?StandardDaylight
America/Havana Yes UTC-5 UTC-4
Asia/Tehran No UTC+3:30

During DST periods the time difference between these zones may be 7 hours 30 minutes instead of 8 hours 30 minutes. Always verify the current offset if scheduling calls near clock-change dates.