GMT to GST Converter
Convert time between Greenwich Mean Time (GMT) and Gulf Standard Time (GST)
Greenwich Mean Time (GMT)
Gulf Standard Time (GST)
Time Difference
Gulf Standard Time (GST) is 0 hours ahead of Greenwich Mean Time (GMT)
Select Date
Select Time
Quick Reference
| GMT | GST |
|---|---|
| 03:00 | 06:00 |
| 05:00 | 08:00 |
| 07:00 | 10:00 |
| 09:00 | 12:00 |
| 11:00 | 14:00 |
| 13:00 | 16:00 |
| 15:00 | 18:00 |
| 17:00 | 20:00 |
| 19:00 | 22:00 |
| 21:00 | 00:00 |
| 23:00 | 02:00 |
| 01:00 | 04:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
About GMT to GST Time Conversion
Converting time between Greenwich Mean Time (GMT) and Gulf Standard Time (GST) involves a 4-hour difference. GMT is UTC+0, while GST is UTC+4, making GST always 4 hours ahead of GMT. This pairing applies during UK winter months when London operates on GMT rather than BST.
This time zone converter uses the IANA timezone database for accurate calculations. GMT applies in the UK from late October to late March, while GST is observed year-round with no daylight saving. During UK summer, the UK switches to BST (UTC+1), reducing the gap to 3 hours — so always confirm which UK offset is active.
Common Use Cases for GMT to GST Conversion
Business & Work
- Scheduling winter meetings between London offices and Dubai or Abu Dhabi teams
- Coordinating UK-Gulf finance, banking, and trade during GMT months
- Planning conference calls with a clean 4-hour difference during winter
Personal & Travel
- Planning winter travel between the UK and the UAE
- Coordinating with family and friends in the Gulf from the UK during winter
- Scheduling video calls across the 4-hour gap
Time Zone Information
Greenwich Mean Time (GMT)
- UTC Offset: UTC+0 (UTC+1 during BST)
- IANA Timezone: Europe/London
- Daylight Saving: Last Sunday in March to Last Sunday in October (BST, UTC+1)
- Major Cities: London, Manchester, Birmingham, Edinburgh, Cardiff
- Coverage: United Kingdom during standard time (winter months)
Gulf Standard Time (GST)
- UTC Offset: UTC+4 (no daylight saving time)
- IANA Timezone: Asia/Dubai
- Daylight Saving: None — GST is observed year-round
- Major Cities: Dubai, Abu Dhabi, Sharjah, Muscat, Fujairah
- Coverage: United Arab Emirates and Oman
Quick Reference: GMT to GST
Remember: GST is always 4 hours ahead of GMT (3 hours ahead when the UK is on BST in summer)
Frequently Asked Questions
What is the time difference between GMT and GST?
Greenwich Mean Time (GMT) is UTC+0, while Gulf Standard Time (GST) is UTC+4. GST is 4 hours ahead of GMT. When it's 12:00 PM in London (GMT), it's 4:00 PM in Dubai (GST).
When does the GMT to GST conversion apply?
GMT applies in the UK from the last Sunday in October to the last Sunday in March (winter months). During UK summer, the UK switches to BST (UTC+1), reducing the gap to 3 hours ahead of GST.
Does the time difference change throughout the year?
Yes. During UK winter (October–March), the gap is 4 hours (GMT vs GST). During UK summer (March–October), the UK moves to BST (UTC+1) and the gap becomes 3 hours. The UAE never observes daylight saving time.
What are the best times for GMT-GST business calls?
With a 4-hour gap, the overlap is solid. The best window is 8:00 AM–2:00 PM GMT (12:00 PM–6:00 PM GST), keeping London in the morning and Dubai in the afternoon during UK winter.
Which countries use Gulf Standard Time (GST)?
GST (UTC+4) is used year-round by the United Arab Emirates and Oman. Major cities include Dubai, Abu Dhabi, Sharjah, and Muscat. GST never observes daylight saving time.
Which regions use Greenwich Mean Time (GMT)?
GMT (UTC+0) applies in the UK during winter months (October–March), covering England, Scotland, Wales, and Northern Ireland. It is also the base reference for Coordinated Universal Time (UTC) used globally.
Pro Tips
- • GST is 4 hours ahead of GMT — add 4 hours to convert London winter time to Dubai time.
- • In UK summer (BST), the gap shrinks to 3 hours — always confirm whether GMT or BST is active.
- • Best meeting window: 8 AM–2 PM GMT (noon–6 PM GST) gives both sides comfortable working hours in winter.
- • The UAE never observes DST — GST stays fixed at UTC+4, so only the UK side shifts twice a year.
- • London and Dubai are two of the world's top financial centres with deep banking, real estate, and trade connections.
- • For recurring winter meetings, the 4-hour GMT-GST gap is one of the most manageable UK-Gulf offsets of the year.