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Convert Greenwich Mean Time (GMT) to Atlantic Standard Time (AST, UTC-4) for regional business calls. Free converter with real-time conversion, meeting time planner, and business hours comparison for GMT to AST coordination. Includes 24-hour conversion table and live time displays. Perfect for international scheduling and global team collaboration. Works on all devices with accurate, reliable results.
Atlantic Standard Time is 4 hours behind Greenwich Mean Time
Complete hourly conversion for Greenwich Mean Time to Atlantic Standard Time
| Greenwich Mean Time | Atlantic Standard Time | 24-Hour GMT | 24-Hour AST |
|---|---|---|---|
| 12:00 AM | 8:00 PM (previous day) | 00:00 | 20:00 |
| 1:00 AM | 9:00 PM (previous day) | 01:00 | 21:00 |
| 2:00 AM | 10:00 PM (previous day) | 02:00 | 22:00 |
| 3:00 AM | 11:00 PM (previous day) | 03:00 | 23:00 |
| 4:00 AM | 12:00 AM | 04:00 | 00:00 |
| 5:00 AM | 1:00 AM | 05:00 | 01:00 |
| 6:00 AM | 2:00 AM | 06:00 | 02:00 |
| 7:00 AM | 3:00 AM | 07:00 | 03:00 |
| 8:00 AM | 4:00 AM | 08:00 | 04:00 |
| 9:00 AM | 5:00 AM | 09:00 | 05:00 |
| 10:00 AM | 6:00 AM | 10:00 | 06:00 |
| 11:00 AM | 7:00 AM | 11:00 | 07:00 |
| 12:00 PM | 8:00 AM | 12:00 | 08:00 |
| 1:00 PM | 9:00 AM | 13:00 | 09:00 |
| 2:00 PM | 10:00 AM | 14:00 | 10:00 |
| 3:00 PM | 11:00 AM | 15:00 | 11:00 |
| 4:00 PM | 12:00 PM | 16:00 | 12:00 |
| 5:00 PM | 1:00 PM | 17:00 | 13:00 |
| 6:00 PM | 2:00 PM | 18:00 | 14:00 |
| 7:00 PM | 3:00 PM | 19:00 | 15:00 |
| 8:00 PM | 4:00 PM | 20:00 | 16:00 |
| 9:00 PM | 5:00 PM | 21:00 | 17:00 |
| 10:00 PM | 6:00 PM | 22:00 | 18:00 |
| 11:00 PM | 7:00 PM | 23:00 | 19:00 |
Optimal hours for calls between GMT and AST
Based on standard business hours (9:00 AM - 6:00 PM) in each time zone
Technical information for both time zones
Source timezone
Target timezone
