Convert Atlantic Standard Time to India Standard Time
Instantly convert Atlantic Standard Time (AST) to India Standard Time (IST) with our free online calculator.
Atlantic Standard Time
01:20:49 AM
Wed, Jun 24 (AST)
India Standard Time
10:50:49 AM
Wed, Jun 24 (IST)
Convert a Specific Time
24-Hour Comparison
| AST | IST |
|---|---|
| 12:00 AM | 9.5:00 AM |
| 1:00 AM | 10.5:00 AM |
| 2:00 AM | 11.5:00 AM |
| 3:00 AM | 0.5:00 PM |
| 4:00 AM | 1.5:00 PM |
| 5:00 AM | 2.5:00 PM |
| 6:00 AM | 3.5:00 PM |
| 7:00 AM | 4.5:00 PM |
| 8:00 AM | 5.5:00 PM |
| 9:00 AM | 6.5:00 PM |
| 10:00 AM | 7.5:00 PM |
| 11:00 AM | 8.5:00 PM |
| 12:00 PM | 9.5:00 PM |
| 1:00 PM | 10.5:00 PM |
| 2:00 PM | 11.5:00 PM |
| 3:00 PM | 0.5:00 AM(+1d) |
| 4:00 PM | 1.5:00 AM(+1d) |
| 5:00 PM | 2.5:00 AM(+1d) |
| 6:00 PM | 3.5:00 AM(+1d) |
| 7:00 PM | 4.5:00 AM(+1d) |
| 8:00 PM | 5.5:00 AM(+1d) |
| 9:00 PM | 6.5:00 AM(+1d) |
| 10:00 PM | 7.5:00 AM(+1d) |
| 11:00 PM | 8.5:00 AM(+1d) |
How to Convert Atlantic Standard Time to India Standard Time
Formula
To convert Atlantic Standard Time (AST) to India Standard Time (IST): Convert AST to IST
About Atlantic Standard Time (AST)
Atlantic Standard Time (AST, IANA: America/Halifax, America/Puerto_Rico) is the time zone for the Canadian Maritime provinces and most of the Caribbean, set at UTC-4:00. AST is observed in: Nova Scotia, New Brunswick, Prince Edward Island, Labrador (partially), Newfoundland's Labrador portion, eastern Quebec, Puerto Rico, US Virgin Islands, Bermuda, Anguilla, Antigua, Aruba, Barbados, British Virgin Islands, Curaçao, Dominica, Grenada, Guadeloupe, Martinique, Saint Lucia, Saint Vincent, Trinidad and Tobago, and Venezuela (since 2007). Canadian Maritime provinces observe AST in winter and switch to ADT = UTC-3:00 in summer per the Energy Policy Act-aligned Canadian schedule. The Caribbean territories (Puerto Rico, USVI, Bermuda) and US territories observe AST year-round without DST per their territorial governments. AST is the same offset as EDT (Eastern Daylight Time) during US summer months, so Halifax and New York are on the same clock in summer but Halifax is one hour ahead in winter.
About India Standard Time (IST)
India Standard Time (IST, IANA: Asia/Kolkata) is the civil time of the Republic of India and Sri Lanka, set at UTC+5:30 — one of the world's most populous 30-minute-offset time zones. India does not observe Daylight Saving Time per the Government of India directive (a brief DST trial in 1942-1945 during WWII was discontinued; subsequent proposals from 2010-2017 were rejected by the Indian Government citing minimal energy savings + agricultural sector disruption). IST is defined as the local mean solar time at 82.5°E longitude (passing through Shankargarh fort in Uttar Pradesh, with the reference clock at the National Physical Laboratory in New Delhi per the Indian Institute of Astrophysics). The 30-minute offset is preserved because India's east-west extent (68°E to 97°E) spans ~28° of longitude — approximately 2 hours of solar time — and the central meridian is most representative for a single unified zone. IST serves approximately 1.4 billion people in India + 22 million in Sri Lanka (Sri Lanka observes SLST = UTC+5:30, identical to IST). Major cities: Mumbai (12.5M), Delhi (16.8M, NCR 29M), Bengaluru (8.4M), Hyderabad (10M), Chennai (7M), Kolkata (4.5M), Ahmedabad (5.5M), Pune (3.1M). Affects: BSE/NSE stock exchanges, IPL Indian Premier League cricket schedules.