ICT to AST Converter
AST is 11 hours behind ICT. 9:00 AM ICT = 10:00 PM AST (previous day).
AST is 11 hours behind ICT at the moment. To convert ICT to AST, subtract 11 hours from the ICT time: 9:00 AM ICT = 10:00 PM AST (previous day).
ICT (Indochina Time) is used in Thailand, Vietnam, Cambodia, Laos. AST (Atlantic Time) is used in Nova Scotia, New Brunswick, PEI; Puerto Rico and the Eastern Caribbean (all year).
AST here is Atlantic Standard Time, not Arabia Standard Time.
ICT to AST time conversion table
ICT to AST on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| ICT | AST | Day |
|---|---|---|
| 12:00 AM ICT | 1:00 PM AST | previous day |
| 1:00 AM ICT | 2:00 PM AST | previous day |
| 2:00 AM ICT | 3:00 PM AST | previous day |
| 3:00 AM ICT | 4:00 PM AST | previous day |
| 4:00 AM ICT | 5:00 PM AST | previous day |
| 5:00 AM ICT | 6:00 PM AST | previous day |
| 6:00 AM ICT | 7:00 PM AST | previous day |
| 7:00 AM ICT | 8:00 PM AST | previous day |
| 8:00 AM ICT | 9:00 PM AST | previous day |
| 9:00 AM ICT | 10:00 PM AST | previous day |
| 10:00 AM ICT | 11:00 PM AST | previous day |
| 11:00 AM ICT | 12:00 AM AST | night |
| 12:00 PM ICT | 1:00 AM AST | night |
| 1:00 PM ICT | 2:00 AM AST | night |
| 2:00 PM ICT | 3:00 AM AST | night |
| 3:00 PM ICT | 4:00 AM AST | night |
| 4:00 PM ICT | 5:00 AM AST | night |
| 5:00 PM ICT | 6:00 AM AST | — |
| 6:00 PM ICT | 7:00 AM AST | — |
| 7:00 PM ICT | 8:00 AM AST | — |
| 8:00 PM ICT | 9:00 AM AST | — |
| 9:00 PM ICT | 10:00 AM AST | — |
| 10:00 PM ICT | 11:00 AM AST | — |
| 11:00 PM ICT | 12:00 PM AST | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert ICT to AST
Subtract 11 hours from the ICT time to get AST.
Example: 9:00 AM ICT = 10:00 PM AST (previous day).
Across midnight: 1:00 AM ICT = 2:00 PM AST (previous day). The date changes, so always check the day as well as the hour.
Time difference between ICT and AST
The time difference between ICT and AST is not the same all year, because the two sides change for daylight saving time on different dates. In 2026 it works out like this:
- 1 Jan 2026 – 7 Mar 2026: AST is 11 hours behind of ICT.
- 8 Mar 2026 – 31 Oct 2026: AST is 10 hours behind of ICT.
- 1 Nov 2026 – 31 Dec 2026: AST is 11 hours behind of ICT.
ICT and AST during daylight saving time
- ICT does not observe daylight saving time; it stays on UTC+7 all year.
- AST next changes on 14 Mar 2027: clocks go forward one hour at 01:59 local time, from AST (UTC−4) to ADT (UTC−3).
Best time for a meeting between ICT and AST
ICT and AST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM ICT, which is 8:00 PM AST.
ICT to AST FAQ
What is the time difference between ICT and AST?
Right now AST is 11 hours behind ICT. The gap changes 3 times in 2026 because the two sides switch to daylight saving time on different dates.
What is 9 AM ICT in AST?
9:00 AM ICT is 10:00 PM AST (previous day).
What is 12 PM (noon) ICT in AST?
12:00 PM ICT is 1:00 AM AST.
Is AST ahead of or behind ICT?
AST is 11 hours behind ICT, so it is earlier in AST than in ICT.
Does ICT change for daylight saving time?
No. ICT stays on the same offset all year, so conversions never shift for daylight saving time.
Does AST change for daylight saving time?
Yes. AST next changes on 14 Mar 2027, when clocks go forward one hour from AST to ADT.
What is the best time for a meeting between ICT and AST?
ICT and AST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 7:00 AM ICT, which is 8:00 PM AST.
Related conversions
Convert AST to ICT
Convert ICT to other time zones
Convert other time zones to AST
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.