BST to JST to CDT
BST is not used on this date
This converter uses GMT (GMT +0), the offset London uses on this date. Open the GMT converter.CDT is not used on this date
This converter uses CST (GMT -6), the offset Chicago uses on this date. Open the CST converter.Compare BST time with JST and CDT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Greenwich Mean Time is 9 hours behind Japan Standard Time and 6 hours ahead of Central Standard Time
12:00 pm12:00 in GMT is 9:00 pm21:00 in JST and is 6:00 am06:00 in CST
GMT to JST call time
Best time for a conference call or a meeting is between 8am-9am in GMT which corresponds to 5pm-6pm in JST
GMT to CST call time
Best time for a conference call or a meeting is between 3pm-5pm in GMT which corresponds to 9am-11am in CST
12:00 pm12:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
9:00 pm21:00 Japan Standard Time (JST). Offset UTC +9:00 hours
6:00 am06:00 Central Standard Time (CST). Offset UTC -6:00 hours
12:00 pm12:00 GMT / 9:00 pm21:00 JST / 6:00 am06:00 CST
| GMT | JST | CST |
|---|---|---|
| 12am (midnight) | 9am | 6pm |
| 1am | 10am | 7pm |
| 2am | 11am | 8pm |
| 3am | 12pm (noon) | 9pm |
| 4am | 1pm | 10pm |
| 5am | 2pm | 11pm |
| 6am | 3pm | 12am (midnight) |
| 7am | 4pm | 1am |
| 8am | 5pm | 2am |
| 9am | 6pm | 3am |
| 10am | 7pm | 4am |
| 11am | 8pm | 5am |
| 12pm (noon) | 9pm | 6am |
| 1pm | 10pm | 7am |
| 2pm | 11pm | 8am |
| 3pm | 12am (midnight) | 9am |
| 4pm | 1am | 10am |
| 5pm | 2am | 11am |
| 6pm | 3am | 12pm (noon) |
| 7pm | 4am | 1pm |
| 8pm | 5am | 2pm |
| 9pm | 6am | 3pm |
| 10pm | 7am | 4pm |
| 11pm | 8am | 5pm |
| 00:00 | 09:00 | 18:00 |
| 01:00 | 10:00 | 19:00 |
| 02:00 | 11:00 | 20:00 |
| 03:00 | 12:00 | 21:00 |
| 04:00 | 13:00 | 22:00 |
| 05:00 | 14:00 | 23:00 |
| 06:00 | 15:00 | 00:00 |
| 07:00 | 16:00 | 01:00 |
| 08:00 | 17:00 | 02:00 |
| 09:00 | 18:00 | 03:00 |
| 10:00 | 19:00 | 04:00 |
| 11:00 | 20:00 | 05:00 |
| 12:00 | 21:00 | 06:00 |
| 13:00 | 22:00 | 07:00 |
| 14:00 | 23:00 | 08:00 |
| 15:00 | 00:00 | 09:00 |
| 16:00 | 01:00 | 10:00 |
| 17:00 | 02:00 | 11:00 |
| 18:00 | 03:00 | 12:00 |
| 19:00 | 04:00 | 13:00 |
| 20:00 | 05:00 | 14:00 |
| 21:00 | 06:00 | 15:00 |
| 22:00 | 07:00 | 16:00 |
| 23:00 | 08:00 | 17:00 |
British Summer Time
Offset: BST is 1 hour ahead Greenwich Mean Time (GMT) and is used in Europe
Countries using this time zone: Britain (UK), Guernsey, Isle of Man, Jersey
Principal Cities: The largest city in the BST time zone is London in United Kingdom, with about 7.557 million people. Other major cities in this time zone include Birmingham, Glasgow, Liverpool, Saint Helier.
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 for the most parts it is the same. In military GMT is known as Zulu time.Greenwich Mean Time was the same as Universal Time (UT), until the introduction of UTC in 1972 a standard astronomical concept used in many technical fields.
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
Japan Standard Time
Offset: JST is 9 hours ahead Greenwich Mean Time (GMT) and is used in Asia
Countries using this time zone: Japan
Principal Cities: The largest city in the JST time zone is Tokyo in Japan, with about 8.337 million people. Other major cities in this time zone include Yokohama, Osaka shi, Nagoya shi, Sapporo.
Daylight Saving: Clocks in Japan Standard Time (JST) do not change for daylight saving time, so JST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter.
JST representations, usage and related time zones
- +09 - basic short
- +0900 - basic
- +09:00 - extended
- +0900 - sign character (+) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates an offset of nine hours to the east of the zero meridian.
- India - Military abbreviation for JST
- I - short form of 'India'
- Asia/Tokyo
- Japan
- AWDT - Australian Western Daylight Time
- CHOST - Choibalsan Summer Time
- I - India Time Zone
- IRKST - Irkutsk Summer Time
- JST - Japan Standard Time
- KST - Korea Standard Time
- PWT - Palau Time
- TLT - East Timor Time
- ULAST - Ulaanbaatar Summer Time
- WIT - Eastern Indonesian Time
- YAKT - Yakutsk Time
Central Daylight Time
Offset: CDT is 5 hours behind Greenwich Mean Time (GMT) and is used in North America
Countries using this time zone: Canada, Mexico, United States
Principal Cities: The largest city in the CDT time zone is Chicago in the United States, with about 2.696 million people. Other major cities in this time zone include Houston, Ciudad Juarez, San Antonio, Dallas.
French: HAC - Heure Avancée du Centre
Spanish: CT - Zona Centro
Daylight Saving: Central Daylight Time (CDT) is a daylight saving/summer time zone, but some places set clocks back one hour during winter and observe Central Standard Time (CST).
End: Central Daylight Time (CDT) ended on Sunday, November 2, 2025 at 2:00 am local time and clocks were set one hour back to Sunday, November 2, 2025, 1:00 am local standard time instead. Daylight saving ends annually on the first Sunday of November
Start: Central Daylight Time (CDT) starts on Sunday, March 8, 2026 at 2:00 am local time and clocks are set one hour forward to Sunday, March 8, 2026, 3:00 am. Daylight saving starts annually on the second Sunday of March
CDT representations, usage and related time zones
- -05 - basic short
- -0500 - basic
- -05:00 - extended
- -0500 - sign character (-) followed by a four digit time providing hours (05) and minutes (00) of the offset. Indicates an offset of five hours to the west of the zero meridian.
- Romeo - Military abbreviation for CDT
- R - short form of 'Romeo'
- America/Chicago
- America/Indiana/Knox
- America/Indiana/Tell_City
- America/Knox_IN
- America/Matamoros
- America/Menominee
- America/North_Dakota/Beulah
- America/North_Dakota/Center
- America/North_Dakota/New_Salem
- America/Ojinaga
- America/Rainy_River
- America/Rankin_Inlet
- America/Resolute
- America/Winnipeg
- CST6CDT
- Canada/Central
- US/Central
- US/Indiana-Starke
- Central Daylight Time - UTC -5
- Cuba Daylight Time - UTC -4
- CDT - Central Daylight Time
- EST - Eastern Standard Time
- ET - Eastern Time
- COT - Colombia Time
- CST - Cuba Standard Time
- EASST - Easter Island Summer Time
- ECT - Ecuador Time
- PET - Peru Time
- R - Romeo Time Zone