AST to CST Converter
CST is 2 hours behind AST
AST to CST Conversion Table
Green rows indicate standard business hours (9 AM – 5 PM) in CST
| AST | CST |
|---|---|
| 12:00 AM | 10:00 PM -1d |
| 1:00 AM | 11:00 PM -1d |
| 2:00 AM | 12:00 AM |
| 3:00 AM | 1:00 AM |
| 4:00 AM | 2:00 AM |
| 5:00 AM | 3:00 AM |
| 6:00 AM | 4:00 AM |
| 7:00 AM | 5:00 AM |
| 8:00 AM | 6:00 AM |
| 9:00 AM | 7:00 AM |
| 10:00 AM | 8:00 AM |
| 11:00 AM | 9:00 AM |
| 12:00 PM | 10:00 AM |
| 1:00 PM | 11:00 AM |
| 2:00 PM | 12:00 PM |
| 3:00 PM | 1:00 PM |
| 4:00 PM | 2:00 PM |
| 5:00 PM | 3:00 PM |
| 6:00 PM | 4:00 PM |
| 7:00 PM | 5:00 PM |
| 8:00 PM | 6:00 PM |
| 9:00 PM | 7:00 PM |
| 10:00 PM | 8:00 PM |
| 11:00 PM | 9:00 PM |
Converting Atlantic Standard Time to Central Standard Time
Atlantic Standard Time (AST) and Central Standard Time (CST) are separated by a 2 hours time difference. CST is 2 hours behind AST. AST is UTC-4, used in Canada, Puerto Rico, US Virgin Islands, while CST is UTC-6, used in United States, Canada, Mexico.
When converting from AST to CST, the key reference points to remember are: 9:00 AM AST equals 7:00 AM CST, 12:00 PM noon AST equals 10:00 AM CST, and 5:00 PM AST equals 3:00 PM CST. The conversion table above shows every hour of the day mapped between these two time zones.
Scheduling Across AST and CST
For professionals scheduling meetings between AST and CST, finding overlapping business hours is essential. Standard business hours are typically 9:00 AM to 5:00 PM in each time zone. Given the 2 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
AST observes Daylight Saving Time, switching to ADT (UTC-3) during summer months. CST observes DST, switching to CDT (UTC-5). 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.