What is the time difference between Kolkata and Sydney?

Sydney is 4 hours 30 minutes ahead of Kolkata during standard time. This may change by up to 1 hour when daylight saving time is active.

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

The best times to connect are 9:00 AM GMT+5:30, 10:00 AM GMT+5:30, 11:00 AM GMT+5:30, when both regions are within standard business hours.

Delhi to Melbourne Time Converter — GMT+5:30 to GMT+11, 4 hours 30 minutes difference

24-Hour Overlap Timeline

✅ Overlap: 9:00 AM–1:00 PM in Delhi · 2:00 PM–6:00 PM in Melbourne (4h window)

⚠ Sydney 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 →
🇮🇳 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
🇦🇺 Melbourne UTC+10	10a	11a	12p	1p	2p	3p	4p	5p	6p	7p	8p	9p	10p	11p	12a	1a	2a	3a	4a	5a	6a	7a	8a	9a
🇮🇳 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 Melbourne (GMT+11)

Time Gap

4h 30m

Sydney ahead

May vary ±1h (DST)

DST Status

✅ Kolkata

No DST

⏰ Sydney: Observes DST

Cities in GMT+5:30

600

Largest: Delhi

32,226,000 pop.

Overlap Window

5h window

9:00 AM – 2:00 PM (GMT+5:30)

1:00 PM – 6:00 PM (GMT+11)

Find Cities in Kolkata & Sydney Timezones

The GMT+5:30 and GMT+11 timezones are separated by 4 hours 30 minutes. Delhi is the largest city in the Asia/Kolkata zone and Melbourne is the largest in Australia/Sydney. Sydney 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: Delhi (GMT+5:30) ↔ Melbourne (GMT+11)

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

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

GMT+5:30 to GMT+11: Complete 24-Hour Time Conversion Table

Kolkata (GMT+5:30)	Sydney (GMT+11)	IST (UTC+5:30)
12:00 AM	4:30 AM	12:00 AM
1:00 AM	5:30 AM	1:00 AM
2:00 AM	6:30 AM	2:00 AM
3:00 AM	7:30 AM	3:00 AM
4:00 AM	8:30 AM	4:00 AM
5:00 AM	9:30 AM	5:00 AM
6:00 AM	10:30 AM	6:00 AM
7:00 AM	11:30 AM	7:00 AM
8:00 AM	12:30 PM	8:00 AM
9:00 AM	1:30 PM	9:00 AM
10:00 AM	2:30 PM	10:00 AM
11:00 AM	3:30 PM	11:00 AM
12:00 PM	4:30 PM	12:00 PM
1:00 PM	5:30 PM	1:00 PM
2:00 PM	6:30 PM	2:00 PM
3:00 PM	7:30 PM	3:00 PM
4:00 PM	8:30 PM	4:00 PM
5:00 PM	9:30 PM	5:00 PM
6:00 PM	10:30 PM	6:00 PM
7:00 PM	11:30 PM	7:00 PM
← Date changes in Sydney →
8:00 PM	12:30 AM +1	8:00 PM
9:00 PM	1:30 AM +1	9:00 PM
10:00 PM	2:30 AM +1	10:00 PM
11:00 PM	3:30 AM +1	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) & 13 Cities in Sydney (GMT+11) — 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

Melbourne & 12 more — Sydney (GMT+11, UTC+10)

🇳🇳

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⚠️ Daylight Saving Time Affects This Pair

Timezone	DST?	Standard	Daylight
Asia/Kolkata	No	UTC+5:30	—
Australia/Sydney	Yes	UTC+10	UTC+11

During DST periods the time difference between these zones may be 5 hours 30 minutes instead of 4 hours 30 minutes. Always verify the current offset if scheduling calls near clock-change dates.

Convert Delhi (GMT+5:30) to Melbourne (GMT+11) Time — 4 hours 30 minutes apart