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GMT to CHAST Converter

GMT
Greenwich Mean Time
GMT +0
12am
3am
6am
9am
12pm
3pm
6pm
9pm
CHAST
Chatham Island Standard Time
GMT +12:45
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

GMT is 12 hours and 45 minutes behind CHAST. GMT uses GMT +0, and CHAST uses GMT +12:45 for this comparison.

For example, 6:00 am GMT is 6:45 pm CHAST. Use the converter above to adjust the date or time and create a shareable meeting link.

Best meeting overlap: 6:15pm-7:15pm GMT, which is 7am-8am CHAST (next day).

Compare GMT time with CHAST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Greenwich Mean Time is 12 hours and 45 minutes behind Chatham Island Standard Time
6:00 am06:00 in GMT is 6:45 pm18:45 in CHAST

GMT to CHAST call time
Best time for a conference call or a meeting is between 6:15pm-7:15pm in GMT which corresponds to 7am-8am in CHAST (next day)

6:00 am06:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
6:45 pm18:45 Chatham Island Standard Time (CHAST). Offset UTC +12:45 hours

6:00 am06:00 GMT / 6:45 pm18:45 CHAST

GMTCHAST
12am (midnight)12:45 pm
1am1:45 pm
2am2:45 pm
3am3:45 pm
4am4:45 pm
5am5:45 pm
6am6:45 pm
7am7:45 pm
8am8:45 pm
9am9:45 pm
10am10:45 pm
11am11:45 pm
12pm (noon)12:45 am
1pm1:45 am
2pm2:45 am
3pm3:45 am
4pm4:45 am
5pm5:45 am
6pm6:45 am
7pm7:45 am
8pm8:45 am
9pm9:45 am
10pm10:45 am
11pm11:45 am
00:0012:45
01:0013:45
02:0014:45
03:0015:45
04:0016:45
05:0017:45
06:0018:45
07:0019:45
08:0020:45
09:0021:45
10:0022:45
11:0023:45
12:0000:45
13:0001:45
14:0002:45
15:0003:45
16:0004:45
17:0005:45
18:0006:45
19:0007:45
20:0008:45
21:0009:45
22:0010:45
23:0011:45

Greenwich Mean Time

Offset: GMT is 0 hours ahead Greenwich Mean Time (GMT) and is used in Europe

Countries using this time zone: Burkina Faso, Côte d'Ivoire, Ghana, Greenland, Gambia, Guinea, Guinea-Bissau, Iceland, Liberia, Mali, Mauritania, St Helena, Sierra Leone, Senegal, Sao Tome & Principe, Togo

Principal Cities: The largest city in the GMT time zone is Abidjan in Ivory Coast, with about 3.677 million people. Other major cities in this time zone include Dakar, Grand Dakar, Accra, Camayenne.

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.

GMT Time Zone Geo Map
GMT timezone map

GMT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
  • +00 - basic short
  • +0000 - basic
  • +00:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Zulu - Military abbreviation for GMT
  • Z - short form of 'Zulu'
IANA/Olson: Reflects GMT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • 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
Time zones with the GMT +0 offset:
  • EGST - Eastern Greenland Summer Time
  • GMT - Greenwich Mean Time
  • WET - Western European Time
  • AZOST - Azores Summer Time
  • UTC - Universal Time Coordinated
  • WT - Western Sahara Standard Time
  • Z - Zulu Time Zone

Chatham Island Standard Time

Offset: CHAST is 12 hours and 45 minutes ahead Greenwich Mean Time (GMT) and is used in Pacific

Countries using this time zone: New Zealand

CHAST Time Zone Geo Map
CHAST timezone map

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).

Start: Chatham Island Standard Time (CHAST) started on Sunday, April 5, 2026 at 3:45 am local time and clocks were set one hour back to Sunday, April 5, 2026, 2:45 am. Standard time starts annually on the first Sunday of April.

End: Chatham Island Standard Time (CHAST) ends on Sunday, September 27, 2026 at 2:45 am local time and clocks are set one hour forward to Sunday, September 27, 2026, 3:45 am local daylight time instead. Standard time ends annually on the last Sunday of September.

CHAST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +1245 - basic
  • +12:45 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +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.
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT