ICT to AST Converter & Meeting Planner
Quick answer: 9:00 AM ICT = 10:00 PM AST (fixed +07:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Indochina Time (ICT) and Atlantic Standard Time (AST)? You need to account for the standard time difference. Atlantic Standard Time is normally 11 hours behind Indochina Time. Whether you are coordinating between teams in Bangkok and Ho Chi Minh City and Halifax and San Juan, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM ICT = 1:00 PM AST. The full 24-hour ICT to AST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM ICT = 4:00 AM AST.
| ICT Time | AST Time |
|---|---|
| 12:00 AM (00:00) | 1:00 PM (13:00)-1 day |
| 1:00 AM (01:00) | 2:00 PM (14:00)-1 day |
| 2:00 AM (02:00) | 3:00 PM (15:00)-1 day |
| 3:00 AM (03:00) | 4:00 PM (16:00)-1 day |
| 4:00 AM (04:00) | 5:00 PM (17:00)-1 day |
| 5:00 AM (05:00) | 6:00 PM (18:00)-1 day |
| 6:00 AM (06:00) | 7:00 PM (19:00)-1 day |
| 7:00 AM (07:00) | 8:00 PM (20:00)-1 day |
| 8:00 AM (08:00) | 9:00 PM (21:00)-1 day |
| 9:00 AM (09:00) | 10:00 PM (22:00)-1 day |
| 10:00 AM (10:00) | 11:00 PM (23:00)-1 day |
| 11:00 AM (11:00) | 12:00 AM (00:00) |
| 12:00 PM (12:00) | 1:00 AM (01:00) |
| 1:00 PM (13:00) | 2:00 AM (02:00) |
| 2:00 PM (14:00) | 3:00 AM (03:00) |
| 3:00 PM (15:00) | 4:00 AM (04:00) |
| 4:00 PM (16:00) | 5:00 AM (05:00) |
| 5:00 PM (17:00) | 6:00 AM (06:00) |
| 6:00 PM (18:00) | 7:00 AM (07:00) |
| 7:00 PM (19:00) | 8:00 AM (08:00) |
| 8:00 PM (20:00) | 9:00 AM (09:00) |
| 9:00 PM (21:00) | 10:00 AM (10:00) |
| 10:00 PM (22:00) | 11:00 AM (11:00) |
| 11:00 PM (23:00) | 12:00 PM (12:00) |
Best time to call Halifax from Bangkok
For most work calls, compare the normal business day in Bangkok (ICT) with the business day in Halifax (AST). ICT commonly covers Southeast Asia, Indochina Peninsula, while AST is mainly associated with North America, Caribbean.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 7:00 PM ICT, which reaches 9:00 AM AST near the start of their workday.
- DST Safety: ICT or AST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Stock Exchange of Thailand (SET): 10:00-16:30 local time in Bangkok.
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Frequently Asked Questions
What is the time difference between ICT and AST?
During standard time, Atlantic Standard Time is 11 hours behind Indochina Time.
Which countries use Indochina Time (ICT)?
Indochina Time is the official standard time for four Southeast Asian nations: Thailand, Vietnam, Cambodia, and Laos. All four countries observe a single, unified UTC+07:00 offset with no regional subdivisions.
Do Thailand and Vietnam observe Daylight Saving Time?
Neither Thailand nor Vietnam observes Daylight Saving Time, and neither do Cambodia or Laos. ICT remains fixed at UTC+07:00 throughout the entire year, with no seasonal clock changes.
Does the Caribbean observe Daylight Saving Time?
The vast majority of Caribbean nations and territories — including Puerto Rico, the Dominican Republic, the US Virgin Islands, Trinidad and Tobago, and Barbados — do not observe Daylight Saving Time and remain on AST (UTC-4) year-round. This means these territories share the same clock as Halifax only during the Atlantic Standard Time window in winter, diverging by one hour once Canada and Bermuda advance to ADT each spring.
What is the difference between AST and ADT?
AST (Atlantic Standard Time) is the standard winter offset at UTC-4:00, observed from the first Sunday in November through the second Sunday in March across all AST regions. ADT (Atlantic Daylight Time) is the summer offset at UTC-3:00, applied by Eastern Canadian provinces and Bermuda when they advance their clocks by one hour during Daylight Saving Time.