GMT to TRT Time Converter

Convert Greenwich Mean Time to Turkey Time - Quick & Accurate

London (GMT)
Istanbul (TRT)
TRT is 3 hours ahead of GMT

Quick Time Conversion

London
Greenwich Mean Time
UTC+0 (GMT) / UTC+1 (BST)
Istanbul
Turkey Time
UTC+3 (TRT)

Current Time Right Now

Greenwich (GMT/BST)
Turkey (TRT)

Updates live every second

24-Hour Visual Comparison

GMT (London)
12am GMT
1am GMT
2am GMT
3am GMT
4am GMT
5am GMT
6am GMT
7am GMT
8am GMT
9am GMT
10am GMT
11am GMT
12pm GMT
1pm GMT
2pm GMT
3pm GMT
4pm GMT
5pm GMT
6pm GMT
7pm GMT
8pm GMT
9pm GMT
10pm GMT
11pm GMT
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TRT (Istanbul)
3am TRT
4am TRT
5am TRT
6am TRT
7am TRT
8am TRT
9am TRT
10am TRT
11am TRT
12pm TRT
1pm TRT
2pm TRT
3pm TRT
4pm TRT
5pm TRT
6pm TRT
7pm TRT
8pm TRT
9pm TRT
10pm TRT
11pm TRT
12am TRT
1am TRT
2am TRT
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Business Hours (9AM-5PM)
Evening (5PM-9PM)
Night (9PM-6AM)

Hover over any hour to see corresponding time in both zones

Best Time for Meeting/Call

To schedule a meeting between GMT and TRT:

Best Window (GMT)
6:00 AM - 2:00 PM
Which is (TRT)
9:00 AM - 5:00 PM
Both parties in business hours
8-hour overlap window
Ideal for UK-Turkey collaboration

Pro Tip: Schedule calls between 9:00 AM - 2:00 PM GMT for maximum overlap with TRT business hours

Complete GMT to TRT Conversion Table

GMT TimeTRT TimeContext
12:00 AM03:00 AM
Midnight GMT
01:00 AM04:00 AM
Late Night
02:00 AM05:00 AM
Late Night
03:00 AM06:00 AM
Late Night
04:00 AM07:00 AM
Late Night
05:00 AM08:00 AM
Late Night
06:00 AM09:00 AM
Early Morning GMT
07:00 AM10:00 AM
Meeting Window
08:00 AM11:00 AM
Meeting Window
09:00 AM12:00 PM
Meeting Window
10:00 AM01:00 PM
Meeting Window
11:00 AM02:00 PM
Meeting Window

Greenwich Mean Time (GMT)

UTC+0
UTC+1 during BST
Major Cities:
  • • London
  • • Manchester
  • • Birmingham
Daylight Saving:

BST (UTC+1) from March to October

IANA Identifier:

Europe/London

Turkey Time (TRT)

UTC+3
No DST (permanent UTC+3)
Major Cities:
  • • Istanbul
  • • Ankara
  • • Izmir
Daylight Saving:

None (abolished in 2016)

IANA Identifier:

Europe/Istanbul

Greenwich Mean Time (GMT) vs Turkey Time (TRT)

Greenwich Mean Time (GMT)Turkey Time (TRT)

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is UTC+0, serving as the reference point for global time zones. During daylight saving time, the UK observes British Summer Time (BST), which is UTC+1.

Turkey Time (TRT) is 3 hours ahead of Coordinated Universal Time (UTC+3). Turkey abolished daylight saving time in 2016, so TRT is used year-round without seasonal changes.

Where Is It Used?

  • United Kingdom: England, Scotland, Wales, Northern Ireland
  • Major Cities: London, Manchester, Birmingham, Glasgow, Liverpool, Edinburgh
  • Ireland: Dublin, Cork (uses IST, same offset as GMT/BST)
  • Portugal: Lisbon, Porto (WET, same offset as GMT)
  • Iceland: Reykjavik (no DST, permanently GMT)
  • West Africa: Senegal, Ghana, Togo, Guinea, Mali
  • Turkey: All of Turkey uses TRT
  • Major Cities: Istanbul, Ankara, Izmir, Bursa, Antalya, Adana
  • Population: Approximately 85 million people
  • Geography: Spans both Europe and Asia
  • Note: Istanbul is the only major city spanning two continents

Key Facts

  • UTC Offset: UTC+0 (GMT) / UTC+1 (BST)
  • Region: Prime Meridian reference point
  • Known For: Global time reference standard
  • Largest City: London (9M metro area)
  • Daylight Saving: Begins last Sunday in March, ends last Sunday in October
  • UTC Offset: UTC+3 (TRT, year-round)
  • Region: Entire Republic of Turkey
  • Known For: Bridge between Europe and Asia
  • Largest City: Istanbul (15M metro area)
  • Economy: Major emerging market and tourist destination
  • Daylight Saving: None (abolished in 2016)

Quick Reference

Time Difference: TRT is 3 hours ahead of GMT (2 hours ahead of BST)
DST Note: Turkey does not observe DST, so the difference changes when UK switches to BST
Distance: Approximately 2,500 km from London to Istanbul
UTC Offsets: GMT = UTC+0, TRT = UTC+3 | BST = UTC+1 (during UK summer)
UK DST: Starts last Sunday in March, Ends last Sunday in October

Frequently Asked Questions

GMT (Greenwich Mean Time) is 3 hours behind TRT (Turkey Time). This means when it's 12:00 PM in London (GMT), it's 3:00 PM in Istanbul (TRT).

The best time to call from GMT to TRT is between 6:00 AM and 2:00 PM GMT, which corresponds to 9:00 AM to 5:00 PM TRT. This ensures both parties are within standard business hours.

Turkey abolished daylight saving time in 2016 and permanently uses TRT (UTC+3). The UK still observes BST, so the time difference varies: 3 hours when UK is on GMT, and 2 hours when UK is on BST.

GMT cities include London, Manchester, and Birmingham. TRT cities include Istanbul, Ankara, and Izmir.

In the UK, DST starts on the last Sunday in March at 1:00 AM and ends on the last Sunday in October at 1:00 AM. During DST, GMT becomes BST (UTC+1).

Related Time Converters

TRT → GMTGMT → CETGMT → MSKCET → EETGMT → ISTGMT → AESTGMT → ESTView All