AST to KST Converter
KST is 13 hours ahead of AST
AST to KST Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in KST
| AST | KST |
|---|---|
| 12:00 AM | 1:00 PM |
| 1:00 AM | 2:00 PM |
| 2:00 AM | 3:00 PM |
| 3:00 AM | 4:00 PM |
| 4:00 AM | 5:00 PM |
| 5:00 AM | 6:00 PM |
| 6:00 AM | 7:00 PM |
| 7:00 AM | 8:00 PM |
| 8:00 AM | 9:00 PM |
| 9:00 AM | 10:00 PM |
| 10:00 AM | 11:00 PM |
| 11:00 AM | 12:00 AM +1d |
| 12:00 PM | 1:00 AM +1d |
| 1:00 PM | 2:00 AM +1d |
| 2:00 PM | 3:00 AM +1d |
| 3:00 PM | 4:00 AM +1d |
| 4:00 PM | 5:00 AM +1d |
| 5:00 PM | 6:00 AM +1d |
| 6:00 PM | 7:00 AM +1d |
| 7:00 PM | 8:00 AM +1d |
| 8:00 PM | 9:00 AM +1d |
| 9:00 PM | 10:00 AM +1d |
| 10:00 PM | 11:00 AM +1d |
| 11:00 PM | 12:00 PM +1d |
Converting Atlantic Standard Time to Korea Standard Time
Atlantic Standard Time (AST) and Korea Standard Time (KST) are separated by a 13 hours time difference. KST is 13 hours ahead of AST. AST is UTC-4, used in Canada, Puerto Rico, US Virgin Islands, while KST is UTC+9, used in South Korea.
When converting from AST to KST, the key reference points to remember are: 9:00 AM AST equals 10:00 PM KST, 12:00 PM noon AST equals 1:00 AM KST, and 5:00 PM AST equals 6:00 AM KST. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across AST and KST
For professionals scheduling meetings between AST and KST, finding overlapping business hours is essential. Standard business hours are typically 9:00 AM to 5:00 PM in each time zone. Given the 13 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
AST observes Daylight Saving Time, switching to ADT (UTC-3) during summer months. KST does not observe DST, staying at UTC+9 year-round. 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.