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CHAST to TOT Converter

Updating current time…
CHADT/CHAST
Chatham Island Daylight Time
GMT +13:45
12am
3am
6am
9am
12pm
3pm
6pm
9pm
Chatham Island is on daylight saving time: CHADT (UTC+13:45) until Sun, Apr 4, 2027.
Use CHAST all year (UTC+12:45)
TOT
Tonga Time
GMT +13
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

Selected conversion

2:00 am02:00 CHADT (UTC+13:45), Oct 10, 2026 = 1:15 am01:15 TOT (UTC+13), Oct 10, 2026

CHADT is 45 minutes ahead of TOT.

CHAST and TOT examples

These examples always use CHAST (UTC+12:45) and TOT (UTC+13). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

CHAST is 15 minutes behind TOT.

How the time difference changes

Depending on seasonal clock changes, CHAST is 15 minutes behind TOT or CHADT is 45 minutes ahead of TOT.

Depending on seasonal clock changes, working hours of 9:00 am to 5:00 pm in CHAST correspond to 9:15 am to 5:15 pm in TOT or working hours of 9:00 am to 5:00 pm in CHADT correspond to 8:15 am to 4:15 pm in TOT.Depending on seasonal clock changes, working hours of 09:00 to 17:00 in CHAST correspond to 09:15 to 17:15 in TOT or working hours of 09:00 to 17:00 in CHADT correspond to 08:15 to 16:15 in TOT.

Compare CHAST time with TOT 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 45 minutes ahead of Tonga Time.
2:00 am02:00 in CHADT is 1:15 am01:15 in TOT

CHADT to TOT call time
Best time for a conference call or a meeting is between 9:45am-5pm09:45-17:00 in CHADT which corresponds to 9am-4:15pm09:00-16:15 in TOT

2:00 am02:00 Chatham Island Daylight Time (CHADT). Offset UTC +13:45 hours
1:15 am01:15 Tonga Time (TOT). Offset UTC +13:00 hours

2:00 am02:00 CHADT / 1:15 am01:15 TOT

CHADTTOT
12:00am11:15pm
1:00am12:15am
2:00am1:15am
3:00am2:15am
4:00am3:15am
5:00am4:15am
6:00am5:15am
7:00am6:15am
8:00am7:15am
9:00am8:15am
10:00am9:15am
11:00am10:15am
12:00pm11:15am
1:00pm12:15pm
2:00pm1:15pm
3:00pm2:15pm
4:00pm3:15pm
5:00pm4:15pm
6:00pm5:15pm
7:00pm6:15pm
8:00pm7:15pm
9:00pm8:15pm
10:00pm9:15pm
11:00pm10:15pm
00:0023:15
01:0000:15
02:0001:15
03:0002:15
04:0003:15
05:0004:15
06:0005:15
07:0006:15
08:0007:15
09:0008:15
10:0009:15
11:0010:15
12:0011:15
13:0012:15
14:0013:15
15:0014:15
16:0015:15
17:0016:15
18:0017:15
19:0018:15
20:0019:15
21:0020:15
22:0021:15
23:0022:15

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).

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.

See upcoming clock changes worldwide.

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.

Tonga Time

Offset: TOT is 13 hours ahead Greenwich Mean Time (GMT) and is used in Pacific

Countries using this time zone: Tonga

Principal Cities: The largest city in the TOT time zone is Nukualofa in Tonga, with about 22,400 people.

Daylight Saving: Clocks in Tonga Time (TOT) do not change for daylight saving time, so TOT stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.

TOT Time Zone Geo Map
TOT timezone map

TOT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +13 - basic short
  • +1300 - basic
  • +13:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +1300 - sign character (+) followed by a four digit time providing hours (13) and minutes (00) of the offset. Indicates an offset of thirteen hours to the east of the zero meridian.
Time zones with the GMT +13 offset:
  • FJST - Fiji Summer Time
  • NZDT - New Zealand Daylight Time
  • PHOT - Phoenix Island Time
  • TKT - Tokelau Time
  • TOT - Tonga Time
  • WST - West Samoa Time
  • WSST - West Samoa Standard Time
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT