CHAST to GMT Converter
No shared working hoursFri, Oct 16
Chatham Island is on daylight saving time: CHADT (UTC+13:45) until Sun, Apr 4, 2027.
The United Kingdom is on summer time: BST (UTC+1) until Sun, Oct 25.
Iceland and Ghana stay on GMT (UTC+0).
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
2:00 am02:00 CHADT (UTC+13:45), Oct 16, 2026 = 12:15 pm12:15 GMT (UTC+0), Oct 15, 2026
CHADT is 13 hours and 45 minutes ahead of GMT.
CHAST and GMT examples
These examples always use CHAST (UTC+12:45) and GMT (UTC+0). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
CHAST is 12 hours and 45 minutes ahead of GMT.
How the time difference changes
Depending on seasonal clock changes, CHAST is 12 hours and 45 minutes ahead of GMT or CHADT is 13 hours and 45 minutes ahead of GMT.
Depending on seasonal clock changes, working hours of 9:00 am to 6:00 pm in CHAST correspond to 8:15 pm (previous day) to 5:15 am in GMT or working hours of 9:00 am to 6:00 pm in CHADT correspond to 7:15 pm (previous day) to 4:15 am in GMT.Depending on seasonal clock changes, working hours of 09:00 to 18:00 in CHAST correspond to 20:15 (previous day) to 05:15 in GMT or working hours of 09:00 to 18:00 in CHADT correspond to 19:15 (previous day) to 04:15 in GMT.
Compare CHAST time with GMT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Chatham Island Daylight Time is 13 hours and 45 minutes ahead of Greenwich Mean Time.
2:00 am02:00 in CHADT is 12:15 pm12:15 in GMT
CHADT to GMT call time
Best time for a conference call or a meeting is between 8am-9am08:00-09:00 in CHADT which corresponds to 6:15pm-7:15pm18:15-19:15 in GMT (previous day). Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
2:00 am02:00 Chatham Island Daylight Time (CHADT). Offset UTC +13:45 hours
12:15 pm12:15 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
2:00 am02:00 CHADT / 12:15 pm12:15 GMT
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.
| CHADT | GMT |
|---|---|
| 10:15am previous day | |
| 11:15am previous day | |
| 12:15pm previous day | |
| 1:15pm previous day | |
| 2:15pm previous day | |
| 3:15pm previous day | |
| 4:15pm previous day | |
| 5:15pm previous day | |
| 6:15pm previous day | |
| 7:15pm previous day | |
| 8:15pm previous day | |
| 9:15pm previous day | |
| 10:15pm previous day | |
| 11:15pm previous day | |
| 12:15am | |
| 1:15am | |
| 2:15am | |
| 3:15am | |
| 4:15am | |
| 5:15am | |
| 6:15am | |
| 7:15am | |
| 8:15am | |
| 9:15am | |
| 10:15 previous day | |
| 11:15 previous day | |
| 12:15 previous day | |
| 13:15 previous day | |
| 14:15 previous day | |
| 15:15 previous day | |
| 16:15 previous day | |
| 17:15 previous day | |
| 18:15 previous day | |
| 19:15 previous day | |
| 20:15 previous day | |
| 21:15 previous day | |
| 22:15 previous day | |
| 23:15 previous day | |
| 00:15 | |
| 01:15 | |
| 02:15 | |
| 03:15 | |
| 04:15 | |
| 05:15 | |
| 06:15 | |
| 07:15 | |
| 08:15 | |
| 09:15 |
Chatham Island Standard Time
Offset: CHAST is 12 hours and 45 minutes ahead of Greenwich Mean Time (GMT).
Countries using this time zone: New Zealand
Principal Cities: The largest city in the CHAST time zone is Waitangi in New Zealand, with about 140 people.
Today the shaded areas are on UTC+13:45.
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Chatham Island Daylight Time (CHADT).
End: Chatham Island Standard Time (CHAST) ended on Sunday, September 27, 2026 at 2:45 am02:45 local time and clocks were set one hour forward to Sunday, September 27, 2026, 3:45 am03:45 local daylight time instead. Standard time ends annually on the last Sunday of September.
Start: Chatham Island Standard Time (CHAST) starts on Sunday, April 4, 2027 at 3:45 am03:45 local time and clocks are set one hour back to Sunday, April 4, 2027, 2:45 am02:45. Standard time starts annually on the first Sunday of April.
CHAST representations, usage and related time zones
- +1245 - basic
- +12:45 - extended
- +1245 - sign character (+) followed by a four digit time providing hours (12) and minutes (45) of the offset. Indicates an offset of twelve hours and forty-five minutes to the east of the zero meridian.
Greenwich Mean Time
Offset: GMT is the same as Greenwich Mean Time (GMT).
Countries using this time zone: Burkina Faso, Côte d'Ivoire, Britain (UK), Guernsey, Ghana, Greenland, Gambia, Guinea, Guinea-Bissau, Ireland, Isle of Man, Iceland, Jersey, Liberia, Mali, Mauritania, St Helena, Sierra Leone, Senegal, Sao Tome & Principe, Togo
Principal Cities: The largest city in the GMT time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Abidjan, Bamako, Dakar, Kumasi.
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.
Today the lighter areas are on UTC+1 (British Summer Time, Irish Standard Time).
GMT representations, usage and related time zones
- Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
- +00 - basic short
- +0000 - basic
- +00:00 - extended
- +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
- Zulu - Military abbreviation for GMT
- Z - short form of 'Zulu'
- Africa/Abidjan
- Africa/Accra
- Africa/Bamako
- Africa/Banjul
- Africa/Bissau
- Africa/Conakry
- Africa/Dakar
- Africa/Freetown
- Africa/Lome
- Africa/Monrovia
- Africa/Nouakchott
- Africa/Ouagadougou
- Africa/Sao_Tome
- Africa/Timbuktu
- America/Danmarkshavn
- Atlantic/Reykjavik
- Atlantic/St_Helena
- Eire
- Etc/GMT
- Etc/GMT+0
- Etc/GMT-0
- Etc/GMT0
- Etc/Greenwich
- Europe/Belfast
- Europe/Dublin
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- GMT
- GMT+0
- GMT-0
- GMT0
- Greenwich
- Iceland
- EGST - Eastern Greenland Summer Time
- GMT - Greenwich Mean Time
- WET - Western European Time
- AZOST - Azores Summer Time
- UTC - Coordinated Universal Time
- WT - Western Sahara Standard Time
- Z - Zulu Time Zone