What is the time difference between Kolkata and GMT-1?

Kolkata is 4 hours 30 minutes ahead of GMT-1 during standard time.

When is the best time to schedule a call between Kolkata and GMT-1?

The best times to connect are 2:00 PM GMT+5:30, 3:00 PM GMT+5:30, 4:00 PM GMT+5:30, when both regions are within standard business hours.

Delhi to Yokosuka Time Converter — GMT+5:30 to GMT+1, 4 hours 30 minutes difference

24-Hour Overlap Timeline

✅ Overlap: 1:00 PM–6:00 PM in Delhi · 9:00 AM–2:00 PM in Yokosuka (5h 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
🇯🇵 Yokosuka UTC+1	1a	2a	3a	4a	5a	6a	7a	8a	9a	10a	11a	12p	1p	2p	3p	4p	5p	6p	7p	8p	9p	10p	11p	12a
🇮🇳 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 Yokosuka (GMT+1)

Time Gap

4h 30m

Kolkata ahead

DST Status

✅ Kolkata

No DST

✅ GMT-1: No DST

Cities in GMT+5:30

600

Largest: Delhi

32,226,000 pop.

Overlap Window

4h window

2:00 PM – 6:00 PM (GMT+5:30)

9:00 AM – 1:00 PM (GMT+1)

Find Cities in Kolkata & GMT-1 Timezones

The GMT+5:30 and GMT+1 timezones are separated by 4 hours 30 minutes. Delhi is the largest city in the Asia/Kolkata zone and Yokosuka is the largest in Etc/GMT-1. Neither timezone observes daylight saving time, so the difference is constant year-round. For scheduling between these regions, the key fact is: there are 4 hours of mutual business-hours overlap each day.

Best Times to Schedule Calls: Delhi (GMT+5:30) ↔ Yokosuka (GMT+1)

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

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

GMT+5:30 to GMT+1: Complete 24-Hour Time Conversion Table

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

Yokosuka & cities — GMT-1 (GMT+1, UTC+1)

Yokosuka, JP 390K

🇳🇳

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Convert Delhi (GMT+5:30) to Yokosuka (GMT+1) Time — 4 hours 30 minutes apart