SGT to AST: SGT is 11 hours ahead of AST

Singapore Time is 11 hours ahead of Atlantic Time right now. It is 10:21 am SGT in Singapore and 11:21 pm ADT in Atlantic, which is already the previous day there.

Convert a specific time from SGT to AST

Pick any time and date to convert it both ways. The conversion runs in your browser against the real zone rules, so a date inside a daylight saving period gets that period's offset rather than today's.

What is the time difference between SGT and AST?

Atlantic Time is 11 hours behind Singapore Time. To go from SGT to AST you subtract 11 hours. That gap is not fixed. Across 2026 the distance between these two zones takes 2 different values, from 11 hours to 12 hours, because Atlantic moves its clocks and Singapore does not. This page recomputes it rather than assuming.

SGT to AST conversion table

Every hour of Friday, September 25, 2026 in Singapore, with the matching reading in Atlantic. 11 of the 24 hours land on a different calendar date in Atlantic, which is the part people get wrong when they schedule across this pair.

What are the best hours to schedule a call between SGT and AST?

No hour of the standard 9:00 am to 5:00 pm working day falls inside working hours on both sides. Singapore and Atlantic are 11 hours apart, which is too far for an overlap, so somebody has to take a call outside their own working day. The least painful options are below, ranked by how close both sides sit to the middle of the afternoon.

Does daylight saving change SGT to AST?

Singapore Time does not move its clocks at all, so its UTC+8 offset holds every day of the year.

Atlantic Time is currently on ADT and changes next on Sunday, November 1, 2026, when the clock falls back from 1:59 am to 1:00 am and the offset moves from UTC-3 to UTC-4.

Because the two sides do not move together, the answer to this conversion changes during the year. For part of the year the gap is 11 hours and for the rest it is 12 hours. The table above is built for today, not for an average day.

Is SGT ahead of or behind AST?

SGT is ahead of AST by 11 hours: when it is 12:00 pm in Singapore, it is 1:00 am in Atlantic. One wrinkle worth knowing: AST and ADT are two names for the same zone, not two zones. Atlantic Time reads AST in winter and ADT in summer. When somebody types "sgt to ast" they nearly always mean the zone rather than the literal winter offset, so this page resolves SGT to Asia/Singapore and AST to America/Halifax and applies whichever offset is genuinely in force on the day.

Singapore Time covers Singapore, and the same reading as Kuala Lumpur. Atlantic Time covers Halifax, Moncton and the Canadian Maritimes. The identifiers behind them are Asia/Singapore and America/Halifax, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.

Questions

What is SGT in AST?

SGT is 11 hours ahead of AST. 9:00 am SGT is 10:00 pm the previous day AST.

How many hours ahead is AST of SGT?

AST is 11 hours behind SGT. That varies across the year, between 11 hours and 12 hours.

What time is it in Atlantic right now?

11:21 pm ADT on Thursday, September 24, 2026.

When can Singapore and Atlantic meet during working hours?

There is no shared working hour. The closest fit is 6:00 pm SGT, which is 7:00 am AST.

Does this account for daylight saving?

Yes. Every reading is computed from the IANA database for the actual date, so SGT and ADT are the abbreviations genuinely in force today rather than a fixed assumption.

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