AST to GST Converter & Meeting Planner
Quick answer: 9:00 AM AST = 5:00 PM GST (fixed -04:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Atlantic Standard Time (AST) and Gulf Standard Time (GST)? You need to account for the standard time difference. Gulf Standard Time is normally 8 hours ahead of Atlantic Standard Time. Whether you are coordinating between teams in Halifax and San Juan and Dubai and Abu Dhabi, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM AST = 8:00 AM GST. The full 24-hour AST to GST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM AST = 11:00 PM GST.
| AST Time | GST Time |
|---|---|
| 12:00 AM (00:00) | 8:00 AM (08:00) |
| 1:00 AM (01:00) | 9:00 AM (09:00) |
| 2:00 AM (02:00) | 10:00 AM (10:00) |
| 3:00 AM (03:00) | 11:00 AM (11:00) |
| 4:00 AM (04:00) | 12:00 PM (12:00) |
| 5:00 AM (05:00) | 1:00 PM (13:00) |
| 6:00 AM (06:00) | 2:00 PM (14:00) |
| 7:00 AM (07:00) | 3:00 PM (15:00) |
| 8:00 AM (08:00) | 4:00 PM (16:00) |
| 9:00 AM (09:00) | 5:00 PM (17:00) |
| 10:00 AM (10:00) | 6:00 PM (18:00) |
| 11:00 AM (11:00) | 7:00 PM (19:00) |
| 12:00 PM (12:00) | 8:00 PM (20:00) |
| 1:00 PM (13:00) | 9:00 PM (21:00) |
| 2:00 PM (14:00) | 10:00 PM (22:00) |
| 3:00 PM (15:00) | 11:00 PM (23:00) |
| 4:00 PM (16:00) | 12:00 AM (00:00)+1 day |
| 5:00 PM (17:00) | 1:00 AM (01:00)+1 day |
| 6:00 PM (18:00) | 2:00 AM (02:00)+1 day |
| 7:00 PM (19:00) | 3:00 AM (03:00)+1 day |
| 8:00 PM (20:00) | 4:00 AM (04:00)+1 day |
| 9:00 PM (21:00) | 5:00 AM (05:00)+1 day |
| 10:00 PM (22:00) | 6:00 AM (06:00)+1 day |
| 11:00 PM (23:00) | 7:00 AM (07:00)+1 day |
Best time to call Dubai from Halifax
For most work calls, compare the normal business day in Halifax (AST) with the business day in Dubai (GST). AST commonly covers North America, Caribbean, while GST is mainly associated with Middle East, Gulf Region.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 9:00 AM - 11:00 AM AST, which corresponds to 4:00 PM - 6:00 PM GST. This window sits inside the typical AST workday (9:00 AM - 5:00 PM) and the GST workday (9:00 AM - 6:00 PM).
- DST Safety: AST or GST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Dubai Financial Market (DFM): 10:00-15:00 local time in Dubai.
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Frequently Asked Questions
What is the time difference between AST and GST?
During standard time, Gulf Standard Time is 8 hours ahead of Atlantic Standard Time.
Does the Caribbean observe Daylight Saving Time?
The vast majority of Caribbean nations and territories — including Puerto Rico, the Dominican Republic, the US Virgin Islands, Trinidad and Tobago, and Barbados — do not observe Daylight Saving Time and remain on AST (UTC-4) year-round. This means these territories share the same clock as Halifax only during the Atlantic Standard Time window in winter, diverging by one hour once Canada and Bermuda advance to ADT each spring.
What is the difference between AST and ADT?
AST (Atlantic Standard Time) is the standard winter offset at UTC-4:00, observed from the first Sunday in November through the second Sunday in March across all AST regions. ADT (Atlantic Daylight Time) is the summer offset at UTC-3:00, applied by Eastern Canadian provinces and Bermuda when they advance their clocks by one hour during Daylight Saving Time.
Does Dubai use Daylight Saving Time?
Dubai and the entire United Arab Emirates do not observe Daylight Saving Time, remaining fixed at UTC+4:00 throughout the year. This means the offset between Dubai and DST-observing countries such as the UK or the US shifts by one hour each spring and autumn when those countries change their clocks.
Is GST the same as UAE Standard Time?
Yes, UAE Standard Time is the national designation for the same UTC+4:00 offset that Gulf Standard Time describes regionally. Both terms refer to the same fixed clock used across the United Arab Emirates, and GST additionally covers Oman under its regional name.