GMT to AKDT Converter
Convert time between Greenwich Mean Time (GMT) and Alaska Daylight Time (AKDT)
Greenwich Mean Time (GMT)
Alaska Daylight Time (AKDT)
Time Difference
Alaska Daylight Time (AKDT) is 0 hours ahead of Greenwich Mean Time (GMT)
Select Date
Select Time
Quick Reference
| GMT | AKDT |
|---|---|
| 03:00 | 18:00 |
| 05:00 | 20:00 |
| 07:00 | 22:00 |
| 09:00 | 00:00 |
| 11:00 | 02:00 |
| 13:00 | 04:00 |
| 15:00 | 06:00 |
| 17:00 | 08:00 |
| 19:00 | 10:00 |
| 21:00 | 12:00 |
| 23:00 | 14:00 |
| 01:00 | 16:00 |
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 AKDT Time Conversion
Converting time between Greenwich Mean Time (GMT) and Alaska Daylight Time (AKDT) bridges London, Reykjavik, Lisbon, and other GMT-aligned regions with Anchorage and Fairbanks. GMT is UTC+0 while AKDT is UTC-8, placing AKDT 8 hours behind GMT.
GMT is the UK's winter standard time and is widely used as a reference timezone (UTC≈GMT). When the UK switches to BST (UTC+1) in summer, the offset to AKDT becomes 9 hours. For most of the year when AKDT is active, the UK is on BST, so the GMT-AKDT pairing applies in brief DST-transition windows or when working with regions like Iceland that stay on GMT year-round.
Common Use Cases for GMT to AKDT Conversion
Business & Work
- Coordinating with Iceland or Portugal-based teams from Alaska
- Working with UTC-aligned global systems and logs
- Planning meetings near DST transitions between the UK and Alaska
Personal & Travel
- Planning travel during DST transition periods
- Coordinating with family and friends in Iceland or Portugal from Alaska
- Understanding GMT as a reference for global event scheduling
Time Zone Information
Greenwich Mean Time (GMT)
- UTC Offset: UTC+0 (UTC+1 during BST)
- IANA Timezone: Europe/London
- Daylight Saving: UK switches to BST from last Sunday in March to last Sunday in October; Iceland and Portugal stay on GMT year-round
- Major Cities: London, Reykjavik, Lisbon, Dublin (DST varies), Casablanca
- Coverage: United Kingdom in winter, plus Iceland year-round and several other Atlantic-aligned regions
Alaska Daylight Time (AKDT)
- UTC Offset: UTC-8
- IANA Timezone: America/Anchorage
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Anchorage, Fairbanks, Juneau, Sitka
- Coverage: Most of Alaska during daylight saving period
Quick Reference: GMT to AKDT
Remember: AKDT is 8 hours behind GMT. For most of the year the UK is on BST instead — see the BST-AKDT page.
Frequently Asked Questions
What is the time difference between GMT and AKDT?
Greenwich Mean Time (GMT) is UTC+0, while Alaska Daylight Time (AKDT) is UTC-8. AKDT is 8 hours behind GMT. When it is 12:00 PM GMT, it is 4:00 AM in Anchorage.
When does this GMT to AKDT conversion apply?
AKDT runs from the second Sunday in March to the first Sunday in November. GMT is the UK's winter standard time and is also used year-round in Iceland and parts of West Africa. The GMT-AKDT pairing is most relevant for those year-round GMT regions.
How does the time difference change throughout the year?
For most of the year when AKDT is active, the UK is on BST (UTC+1) — see the BST-AKDT page. The GMT-AKDT 8-hour offset applies in brief DST-transition windows for the UK, and year-round for Iceland.
What are the best times for GMT-AKDT business calls?
Late afternoon GMT (5:00 PM) is 9:00 AM in Anchorage — a strong morning for AKDT and a workable late afternoon for European partners.
Which countries/regions use AKDT timezone?
AKDT covers most of Alaska during daylight saving, including Anchorage, Fairbanks, Juneau, and Sitka. The Aleutian Islands use Hawaii-Aleutian Time and follow a different rule set.
Which countries/regions use GMT timezone?
GMT is the UK's winter standard, plus year-round in Iceland, Portugal (mainland follows BST/WEST), and parts of West Africa including Ghana and Senegal. UTC is closely aligned with GMT and used as a reference for global timestamps.
Pro Tips
- • AKDT is 8 hours behind GMT — subtract 8 hours from a GMT time to get the Anchorage time.
- • When working with the UK during Alaska's DST window, the UK is on BST not GMT — see the BST-AKDT page.
- • Best meeting window: 5:00–7:00 PM GMT overlaps with 9:00–11:00 AM AKDT.
- • GMT is the practical equivalent of UTC for timestamp coordination — most server logs use UTC, which aligns with GMT year-round.
- • Use IANA identifiers (Europe/London or Atlantic/Reykjavik and America/Anchorage) in calendar tools to handle DST automatically.
- • Late afternoon and evening GMT maps cleanly to Alaska morning; very early morning GMT pushes into the prior calendar day in Alaska.