UTC to AST Converter
AST is 4 hours behind UTC
UTC to AST Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in AST
| UTC | AST |
|---|---|
| 12:00 AM | 8:00 PM -1d |
| 1:00 AM | 9:00 PM -1d |
| 2:00 AM | 10:00 PM -1d |
| 3:00 AM | 11:00 PM -1d |
| 4:00 AM | 12:00 AM |
| 5:00 AM | 1:00 AM |
| 6:00 AM | 2:00 AM |
| 7:00 AM | 3:00 AM |
| 8:00 AM | 4:00 AM |
| 9:00 AM | 5:00 AM |
| 10:00 AM | 6:00 AM |
| 11:00 AM | 7:00 AM |
| 12:00 PM | 8:00 AM |
| 1:00 PM | 9:00 AM |
| 2:00 PM | 10:00 AM |
| 3:00 PM | 11:00 AM |
| 4:00 PM | 12:00 PM |
| 5:00 PM | 1:00 PM |
| 6:00 PM | 2:00 PM |
| 7:00 PM | 3:00 PM |
| 8:00 PM | 4:00 PM |
| 9:00 PM | 5:00 PM |
| 10:00 PM | 6:00 PM |
| 11:00 PM | 7:00 PM |
Converting Coordinated Universal Time to Atlantic Standard Time
Coordinated Universal Time (UTC) and Atlantic Standard Time (AST) are separated by a 4 hours time difference. AST is 4 hours behind UTC. UTC is UTC+0, while AST is UTC-4, used in Canada, Puerto Rico, US Virgin Islands.
When converting from UTC to AST, the key reference points to remember are: 9:00 AM UTC equals 5:00 AM AST, 12:00 PM noon UTC equals 8:00 AM AST, and 5:00 PM UTC equals 1:00 PM AST. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across UTC and AST
For professionals scheduling meetings between UTC 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 4 hours difference, the window of overlap may be limited. Use the highlighted working hours in the conversion table above to quickly identify suitable meeting times.
Daylight Saving Time Considerations
UTC does not observe Daylight Saving Time, maintaining UTC+0 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.