Historically distinct IANA time zone
Pacific/Tongatapu
- Countries
- Tonga
- GPS reference
- 21.13° S, 175.20° W
- Data source
- IANA australasia
- Aliases
- None
- Rule groups
- Tonga
TongaGeographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 21.13° S, 175.20° W. Associated countries: TO.
The Wikipedia link provides additional context; it is not evidence for a historical claim. Transition data comes from the IANA source file.
Notes from the time database
The story behind the clock
These source notes describe a period or rule. They do not, by themselves, establish a causal claim for a particular clock change.
Tonga
Original IANA source file: australasia.
A shared present
Same clock today, different past
These nearby zones follow the same current annual pattern, yet retain their own historical record.
Samoa · 891 km from the reference location · Same annual clock since 2022
TK · 1376 km from the reference location · Same annual clock since 2018
Kiribati · 2075 km from the reference location · Same annual clock since 2018Civil-time record
Recorded changes over time
From 1945 to 2017 · 10 recorded transitions
Recurring daylight-saving changes are grouped separately when JavaScript is available.
Notable changes
One-off changes and transitions outside the recurring seasonal rhythm.
- +12:20 · +1220Standard time applies
- +13:00 · +13Standard time applies
- +14:00 · +14Daylight saving time begins
- +13:00 · +13Standard time applies
- +14:00 · +14Daylight saving time begins
- +13:00 · +13Standard time applies
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1945-09-10 00:00 | +12:20 | +1220 | Standard time |
| 1961-01-01 00:40 | +13:00 | +13 | Standard time |
| 1999-10-07 03:00 | +14:00 | +14 | Daylight saving time |
| 2000-03-19 02:00 | +13:00 | +13 | Standard time |
| 2000-11-05 03:00 | +14:00 | +14 | Daylight saving time |
| 2001-01-28 01:00 | +13:00 | +13 | Standard time |
| 2001-11-04 03:00 | +14:00 | +14 | Daylight saving time |
| 2002-01-27 01:00 | +13:00 | +13 | Standard time |
| 2016-11-06 03:00 | +14:00 | +14 | Daylight saving time |
| 2017-01-15 02:00 | +13:00 | +13 | Standard time |