GST to AST Converter & Meeting Planner
Quick answer: 9:00 AM GST = 1:00 AM AST (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 Gulf Standard Time (GST) and Atlantic Standard Time (AST)? You need to account for the standard time difference. Atlantic Standard Time is normally 8 hours behind Gulf Standard Time. Whether you are coordinating between teams in Dubai and Abu Dhabi and Halifax and San Juan, 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 GST = 4:00 PM AST. The full 24-hour GST to AST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM GST = 7:00 AM AST.
| GST Time | AST Time |
|---|---|
| 12:00 AM (00:00) | 4:00 PM (16:00)-1 day |
| 1:00 AM (01:00) | 5:00 PM (17:00)-1 day |
| 2:00 AM (02:00) | 6:00 PM (18:00)-1 day |
| 3:00 AM (03:00) | 7:00 PM (19:00)-1 day |
| 4:00 AM (04:00) | 8:00 PM (20:00)-1 day |
| 5:00 AM (05:00) | 9:00 PM (21:00)-1 day |
| 6:00 AM (06:00) | 10:00 PM (22:00)-1 day |
| 7:00 AM (07:00) | 11:00 PM (23:00)-1 day |
| 8:00 AM (08:00) | 12:00 AM (00:00) |
| 9:00 AM (09:00) | 1:00 AM (01:00) |
| 10:00 AM (10:00) | 2:00 AM (02:00) |
| 11:00 AM (11:00) | 3:00 AM (03:00) |
| 12:00 PM (12:00) | 4:00 AM (04:00) |
| 1:00 PM (13:00) | 5:00 AM (05:00) |
| 2:00 PM (14:00) | 6:00 AM (06:00) |
| 3:00 PM (15:00) | 7:00 AM (07:00) |
| 4:00 PM (16:00) | 8:00 AM (08:00) |
| 5:00 PM (17:00) | 9:00 AM (09:00) |
| 6:00 PM (18:00) | 10:00 AM (10:00) |
| 7:00 PM (19:00) | 11:00 AM (11:00) |
| 8:00 PM (20:00) | 12:00 PM (12:00) |
| 9:00 PM (21:00) | 1:00 PM (13:00) |
| 10:00 PM (22:00) | 2:00 PM (14:00) |
| 11:00 PM (23:00) | 3:00 PM (15:00) |
Best time to call Halifax from Dubai
For most work calls, compare the normal business day in Dubai (GST) with the business day in Halifax (AST). GST commonly covers Middle East, Gulf Region, while AST is mainly associated with North America, Caribbean.
⚠️ 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 4:00 PM - 6:00 PM GST, which corresponds to 9:00 AM - 11:00 AM AST. This window sits inside the typical GST workday (9:00 AM - 6:00 PM) and the AST workday (9:00 AM - 5:00 PM).
- DST Safety: GST or AST 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 GST and AST?
During standard time, Atlantic Standard Time is 8 hours behind Gulf Standard 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.
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.