TRT ↔ GMT Time Converter

Greenwich Mean Time (GMT) is 3h behind of Turkey Time (TRT). TRT runs at UTC+3 and GMT at UTC+0 / UTC+1 (BST). Quick time examples: 8:00 AM TRT = 5:00 AM GMT; 12:00 PM TRT = 9:00 AM GMT; 5:00 PM TRT = 2:00 PM GMT.

To convert TRT to GMT, subtract 3 hours to the TRT time. For example, 12:00 PM TRT becomes 9:00 AM GMT. When the result crosses midnight, advance the date by one day (shown as "+1 Day" in the converter). The converter on this page handles all arithmetic and date-rollover automatically.

Greenwich Mean Time (GMT) is 3h behind of Turkey Time (TRT). Reversed: TRT is 3h ahead of GMT. Practical example: noon in London (12:00 PM GMT) corresponds to 3:00 PM TRT in Istanbul, and 5 PM in London corresponds to 8:00 PM TRT.

Turkey Time (TRT) is the standard civil time for Istanbul and the surrounding region, operating at UTC+3 from UTC. It does not observe Daylight Saving Time; the UTC offset stays at UTC+3 every day of the year. Major cities: Istanbul, Ankara, Izmir, Bursa, Adana, Gaziantep, Konya.

Greenwich Mean Time (GMT) covers London and the surrounding region at UTC+0 / UTC+1 (BST) from UTC. It observes Daylight Saving Time and shifts its clocks seasonally. Cities in this zone: London, Dublin, Lisbon, Reykjavik, Accra, Abidjan, Dakar.

Yes. GMT observes Daylight Saving Time and shifts its clocks by one hour in summer, while TRT stays fixed at UTC+3 year-round. The gap changes seasonally when GMT transitions in or out of DST. The live converter auto-adjusts so you always see the right offset.

The best meeting window is where standard working hours (9 AM – 6 PM) overlap in both zones. Since GMT is 3h behind of TRT, mornings in the earlier zone align with afternoons or evenings in the later zone. Target 8 AM – 11 AM in the earlier-offset zone to keep both sides in reasonable hours. The meeting hours table above shows the exact recommended slots for this pair. Any time where one side falls before 7 AM or after 9 PM is best avoided for regular team calls.

Type any time directly into the GMT field in the bidirectional converter above — it instantly shows the TRT result. Alternatively, add 3 hours from the GMT time manually. For a dedicated reverse page, visit: GMT to TRT converter ↗.

For some hours of the day the conversion does cross midnight into the next or previous calendar day. When the converted time passes 11:59 PM, the date advances — the converter shows "+1 Day". When it goes before 12:00 AM, the date moves back — "-1 Day" appears. The 24-hour reference table also shows day changes in the Day column. Always check the date indicator when sending calendar invites across these two zones to avoid accidentally booking on the wrong date.

Turkey Time (TRT) is used in: Istanbul, Ankara, Izmir, Bursa, Adana, Gaziantep, Konya. The zone operates at UTC+3, with a constant offset all year.

Greenwich Mean Time (GMT) covers: London, Dublin, Lisbon, Reykjavik, Accra, Abidjan, Dakar. It runs at UTC+0 / UTC+1 (BST)and observes Daylight Saving Time seasonally. Use the live clocks at the top of this page to see the current local time in both zones side by side.

The standard offset is 3h behind, but this can shift by one hour during DST transition periods. When GMT moves to or from its daylight variant, the gap changes. The live converter always shows the current accurate offset.

When creating a recurring meeting that spans TRT and GMT, set the event timezone in your calendar app using the IANA timezone names: Europe/Istanbul for TRT and Europe/London for GMT. Using IANA names rather than fixed UTC offsets ensures the calendar app automatically adjusts future occurrences for any DST changes, so you never accidentally schedule at the wrong time after a clock transition. For a quick lookup of any specific time, the converter on this page is the fastest way to verify both sides before you send the invite.

No. Turkey permanently adopted UTC+3 in 2016, effectively staying on what was previously its summer time offset and never switching back. Since then, TRT has been fixed at UTC+3 all year — no spring forward, no fall back. This means the Turkey side of any timezone pair is always stable, and any seasonal variation in the TRT–GMT offset comes entirely from the other zone (GMT observing DST).