ICT to AST Converter
AST is 11 hours behind ICT
ICT to AST Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in AST
| ICT | AST |
|---|---|
| 12:00 AM | 1:00 PM -1d |
| 1:00 AM | 2:00 PM -1d |
| 2:00 AM | 3:00 PM -1d |
| 3:00 AM | 4:00 PM -1d |
| 4:00 AM | 5:00 PM -1d |
| 5:00 AM | 6:00 PM -1d |
| 6:00 AM | 7:00 PM -1d |
| 7:00 AM | 8:00 PM -1d |
| 8:00 AM | 9:00 PM -1d |
| 9:00 AM | 10:00 PM -1d |
| 10:00 AM | 11:00 PM -1d |
| 11:00 AM | 12:00 AM |
| 12:00 PM | 1:00 AM |
| 1:00 PM | 2:00 AM |
| 2:00 PM | 3:00 AM |
| 3:00 PM | 4:00 AM |
| 4:00 PM | 5:00 AM |
| 5:00 PM | 6:00 AM |
| 6:00 PM | 7:00 AM |
| 7:00 PM | 8:00 AM |
| 8:00 PM | 9:00 AM |
| 9:00 PM | 10:00 AM |
| 10:00 PM | 11:00 AM |
| 11:00 PM | 12:00 PM |
Converting Indochina Time to Atlantic Standard Time
Indochina Time (ICT) and Atlantic Standard Time (AST) are separated by a 11 hours time difference. AST is 11 hours behind ICT. ICT is UTC+7, used in Thailand, Vietnam, Cambodia, while AST is UTC-4, used in Canada, Puerto Rico, US Virgin Islands.
When converting from ICT to AST, the key reference points to remember are: 9:00 AM ICT equals 10:00 PM AST, 12:00 PM noon ICT equals 1:00 AM AST, and 5:00 PM ICT equals 6:00 AM AST. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across ICT and AST
For professionals scheduling meetings between ICT and AST, finding overlapping business hours is essential. Standard business hours are typically 9:00 AM to 5:00 PM in each time zone. Given the 11 hours difference, the window of overlap may be limited, making early morning or late evening calls necessary for one party. Use the highlighted working hours in the conversion table above to quickly identify suitable meeting times.
Daylight Saving Time Considerations
ICT does not observe Daylight Saving Time, maintaining UTC+7 year-round. AST observes DST, switching to ADT (UTC-3). During DST transitions, the time difference between these zones may temporarily change by 1 hour. Always verify the current offset during spring and fall transition periods.