BST to RET Converter
Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
12:30 pm12:30 GMT (UTC+0), Oct 25, 2026 = 4:30 pm16:30 RET (UTC+4), Oct 25, 2026
GMT is 4 hours behind RET.
BST and RET examples
These examples always use BST (UTC+1) and RET (UTC+4). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
BST is 3 hours behind RET.
How the time difference changes
For most of the year, BST is 3 hours behind RET. From Oct 25, 2026 to Mar 28, 2027, GMT is 4 hours behind RET.
For most of the year, working hours of 9:00 am to 6:00 pm in BST correspond to 12:00 pm to 9:00 pm in RET. At other times of the year, working hours of 9:00 am to 6:00 pm in GMT correspond to 1:00 pm to 10:00 pm in RET.For most of the year, working hours of 09:00 to 18:00 in BST correspond to 12:00 to 21:00 in RET. At other times of the year, working hours of 09:00 to 18:00 in GMT correspond to 13:00 to 22:00 in RET.
Compare BST time with RET time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Greenwich Mean Time is 4 hours behind Reunion Time.
12:30 pm12:30 in GMT is 4:30 pm16:30 in RET
GMT to RET call time
Best time for a conference call or a meeting is between 9am-2pm09:00-14:00 in GMT which corresponds to 1pm-6pm13:00-18:00 in RET
12:30 pm12:30 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
4:30 pm16:30 Reunion Time (RET). Offset UTC +4:00 hours
12:30 pm12:30 GMT / 4:30 pm16:30 RET
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| GMT | RET |
|---|---|
| 3:00am | |
| 4:00am | |
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British Summer Time
Offset: BST is 1 hour ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Guernsey, Isle of Man, Jersey, United Kingdom
Principal Cities: The largest city in the BST time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Birmingham, Glasgow, Manchester, Sheffield.
Greenwich Mean Time (GMT) originally referred to the mean solar time at the Royal Observatory in Greenwich, London. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, and in casual use the two are the same. In the military, GMT is known as Zulu time. Greenwich Mean Time was the same as Universal Time (UT), a standard astronomical concept used in many technical fields, until the introduction of UTC in 1972.
Current time in the United Kingdom: UK time now
Today the shaded areas are on UTC+0 (GMT).
BST representations, usage and related time zones
- +01 - basic short
- +0100 - basic
- +01:00 - extended
- +0100 - sign character (+) followed by a four digit time providing hours (01) and minutes (00) of the offset. Indicates an offset of one hour to the east of the zero meridian.
- Alpha - Military abbreviation for BST
- A - short form of 'Alpha'
- Europe/Belfast
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- British Summer Time - UTC +1
- Bangladesh Standard Time - UTC +6
- Bougainville Standard Time - UTC +11
- BST - British Summer Time
- CET - Central European Time
- IST - Irish Standard Time
- WEST - Western European Summer Time
- A - Alpha Time Zone
- CET - Central European Time
- MEZ - Mitteleuropäische Zeit
- WAT - West Africa Time
- WST - Western Sahara Summer Time
- BMT - Biel Mean Time
Reunion Time
Offset: RET is 4 hours ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Réunion
Principal Cities: The largest city in the RET time zone is Saint-Denis in Réunion, with about 154,765 people. Other major cities in this time zone include Saint-Paul, Saint-Pierre, Le Tampon, Saint-André.
Daylight Saving: Clocks in Reunion Time (RET) do not change for daylight saving time, so RET stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
RET representations, usage and related time zones
- +04 - basic short
- +0400 - basic
- +04:00 - extended
- +0400 - sign character (+) followed by a four digit time providing hours (04) and minutes (00) of the offset. Indicates an offset of four hours to the east of the zero meridian.
- Delta - Military abbreviation for RET
- D - short form of 'Delta'
- KUYT - Kuybyshev Time
- MSD - Moscow Daylight Time
- SAMT - Samara Time
- AMT - Armenia Time
- AZT - Azerbaijan Time
- D - Delta Time Zone
- GET - Georgia Standard Time
- GST - Gulf Standard Time
- MUT - Mauritius Time
- RET - Reunion Time
- SCT - Seychelles Time