What is the time difference between Kolkata and Tehran?

Kolkata is 2 hours ahead of Tehran during standard time.

When is the best time to schedule a call between Kolkata and Tehran?

The best times to connect are 11:00 AM GMT+5:30, 12:00 PM GMT+5:30, 1:00 PM GMT+5:30, when both regions are within standard business hours.

Delhi to Tehran Time Converter — GMT+5:30 to GMT+3:30, 2 hours difference

24-Hour Overlap Timeline

✅ Overlap: 11:00 AM–6:00 PM in Delhi · 9:00 AM–4:00 PM in Tehran (7h window)

	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 →
🇮🇳 Delhi UTC+5:30	5a	6a	7a	8a	9a	10a	11a	12p	1p	2p	3p	4p	5p	6p	7p	8p	9p	10p	11p	12a	1a	2a	3a	4a
🇮🇷 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
🇮🇳 India (IST) UTC+5:30	5a	6a	7a	8a	9a	10a	11a	12p	1p	2p	3p	4p	5p	6p	7p	8p	9p	10p	11p	12a	1a	2a	3a	4a

Both working Working Off hours Sleeping Now

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

Time Gap

2h

Kolkata ahead

DST Status

✅ Kolkata

No DST

✅ Tehran: No DST

Cities in GMT+5:30

600

Largest: Delhi

32,226,000 pop.

Overlap Window

7h window

11:00 AM – 6:00 PM (GMT+5:30)

9:00 AM – 4:00 PM (GMT+3:30)

Find Cities in Kolkata & Tehran Timezones

The GMT+5:30 and GMT+3:30 timezones are separated by 2 hours. Delhi is the largest city in the Asia/Kolkata zone and Tehran is the largest in Asia/Tehran. Neither timezone observes daylight saving time, so the difference is constant year-round. For scheduling between these regions, the key fact is: there are 7 hours of mutual business-hours overlap each day.

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

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

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

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

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

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

600 Cities in Kolkata (GMT+5:30) & 163 Cities in Tehran (GMT+3:30) — Page 1 of 3

Delhi & 599 more — Kolkata (GMT+5:30, UTC+5:30)

Kottarassheri, IN Attadappa, IN Barmhan Kalan, IN Mirzapur, IN Nagpur, IN Ghaziabad, IN Supaul, IN Vadodara, IN Rajkot, IN Vishakhapatnam, IN Indore, IN Thane, IN Bhopal, IN Agra, IN Peyanvilai, IN Pimpri-Chinchwad, IN Patna, IN Bilaspur, IN Ludhiana, IN Madurai, IN Jamshedpur, IN Nasik, IN Vijayawada, IN Faridabad, IN Najafgarh, IN Meerut, IN Jabalpur, IN Kalyan, IN Vasai-Virar, IN Panipat, IN Varanasi, IN Kalleli, IN Srinagar, IN Aurangabad, IN Dhanbad, IN Amritsar, IN Aligarh, IN Guwahati, IN Haora, IN Ranchi, IN Gwalior, IN Chandigarh, IN Jodhpur, IN Raipur, IN Kota, IN Bareilly, IN Coimbatore, IN Solapur, IN Hubli, IN Mysore, IN Trichinopoly, IN Moradabad, IN Tiruppur, IN Gurgaon, IN Jalandhar, IN Bhubaneshwar, IN Narela, IN Bhayandar, IN Karimnagar, IN Patiala, IN Shishgarh, IN Colombo, LK Thiruvananthapuram, IN Durgapur, IN Bhiwandi, IN Bhilwara, IN Saharanpur, IN Warangal, IN Shiliguri, IN Salem, IN Kochi, IN Gorakhpur, IN Guntur, IN Karaikandi, IN Haldwani, IN Dhulia, IN Bhavnagar, IN Noida, IN Bhangar, IN Bhilai, IN Mangalore, IN Bihta, IN Hasanpur, IN Cuttack, IN Salimpur, IN Raurkela, IN Tumkur, IN Dehra Dun, IN Kottayam, IN Asansol, IN Bokaro Steel City, IN Kolhapur, IN Nava Raipur, IN Ajmer, IN Nanded, IN Amravati, IN Nellore, IN Dispur, IN Gulbarga, IN Bikaner, IN Agartala, IN Chanda, IN Loni, IN Ujjain, IN Jhansi, IN Ulhasnagar, IN Jammu, IN Tuticorin, IN Purnea, IN Belgaum, IN Vellore, IN Malegaon, IN Jamnagar, IN Bardoli, IN Gaya, IN Ambattur, IN Jalgaon, IN Chhatarpur, IN Kurnool, IN Udaipur, IN Wapi, IN Chauddagram, BD Mathura, IN Sangli, IN Davangere, IN Calicut, IN Mothihari, IN Akola, IN Bettiah, IN Shorapur, IN Tinnevelly, IN Bellary, IN Bhagalpur, IN Manampizha, IN Delhi Cantonment, IN Salt Lake City, IN Etawa, IN Sonipat, IN Quilon, IN Mulangodi, IN Munro Turuttu, IN Karur, IN Jalna, IN Bairia, IN Bhatpara, IN Sirur, IN Kakinada, IN Panihati, IN Rohtak, IN Maler Kotla, IN Kolga, IN Korba, IN Sikar, IN Sasaram, IN Karnal, IN Brahmapur, IN Ahmadnagar, IN Shahjanpur, IN Avadi, IN Khanapur, IN Cuddapah, IN Alamadi, IN Rajahmundry, IN Alwar, IN Sambalpur, IN Muzaffarpur, IN Kamarhati, IN Campiernagar, IN Bijapur, IN Ratnagiri, IN Jagdalpur, IN Rampur, IN Shimoga, IN Kashipur, IN Junagadh, IN Hapur, IN Pattikad, IN Trichur, IN Barddhaman, IN Panvel, IN Nizamabad, IN Parbhani, IN Hisar, IN Fatehpur, IN Birania, IN

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

Hamadan, IR Yazd, IR Ardabil, IR Bandar `Abbas, IR Arak, IR Eslamshahr, IR Sanandaj, IR Qazvin, IR Zanjan, IR Gorgan, IR Shahriar, IR Shahr-e Qods, IR Kashan, IR Malard, IR Maragheh, IR Sarta, IR Dezful, IR Babol, IR Qa'em Shahr, IR Khomeyni Shahr, IR Sabzevar, IR Andimeshk, IR Amol, IR Pakdasht, IR Najafabad, IR Borujerd, IR Madan, IR Qarchak, IR Bojnurd, IR Varamin, IR Bandar-e Bushehr, IR Neyshabur, IR Saveh, IR Birjand, IR Nasim Shahr, IR Khorramabad, IR Khowy, IR Bukan, IR Shahr-e Kord, IR Semnan, IR Fardis, IR Sirjan, IR Shahin Shahr, IR Malayer, IR Mahabad, IR Saqqez, IR Shahrud, IR Khodabandeh, IR Bandar-e Mahshahr, IR Rafsanjan, IR Borazjan, IR Gonbad-e Kavus, IR Marvdasht, IR Quchan, IR Jahrom, IR Kamalshahr, IR Torbat-e Heydariyeh, IR Marivan, IR Shahreza, IR Zabol, IR Khorramshahr, IR Marand, IR Jiroft, IR Salmas, IR Bam, IR Behbahan, IR Dorud, IR Nazarabad, IR Mohammad Shahr, IR Bandar-e Anzali, IR Iranshahr, IR Fasa, IR Baneh, IR Yasuj, IR Chabahar, IR Robat Karim, IR Kashmar, IR Shushtar, IR Ahar, IR Masjed Soleyman, IR Torbat-e Jam, IR Abhar, IR Mianeh, IR Do Gonbadan, IR Kazerun, IR Behshahr, IR Alvand, IR Piranshahr, IR Eslamabad-e Gharb, IR Kuhdasht, IR Fulad Shahr, IR Khowrasgan, IR Tajrish, IR Shirvan, IR Meybod, IR Takestan, IR Langarud, IR Bumahen, IR Baharestan, IR Aligudarz, IR Bandar-e Emam Khomeyni, IR Bandar Emam, IR Qorveh, IR Shush, IR Nahavand, IR Bonab, IR Ardakan, IR Ramhormoz, IR Meshgin Shahr, IR Bandar-e Genaveh, IR Naqadeh, IR Khomeyn, IR Omidiyeh, IR Aran Bidgol, IR Baqershahr, IR Mahdasht, IR Mobarakeh, IR Meshkin Dasht, IR Neka, IR Kangan, IR Abyek, IR Saravan, IR Babolsar, IR Esfarayen, IR Damghan, IR Zarand, IR Borujen, IR Dehdasht, IR Khash, IR Taybad, IR Kut-e `Abdollah, IR Zarrin Shahr, IR Asadabad, IR Hashtgerd, IR Tonekabon, IR Khorramdarreh, IR Eqbaliyeh, IR Javanrud, IR Hashtpar, IR Sefrou, MA Sabbashahr, IR Bandar-e Torkaman, IR Chenaran, IR Bijar, IR `Aliabad-e Katul, IR Kahnuj, IR Susangerd, IR Tuyserkan, IR

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Convert Delhi (GMT+5:30) to Tehran (GMT+3:30) Time — 2 hours apart