Antarctica/Syowa

Time zone identifier: Antarctica/Syowa

Current civil offset: +03:00 (+03)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1957-01-29

Total recorded transitions: 1 transitions across 2 distinct offsets

Associated countries: AQ

Historical Offset Step Chart (1880 to Present)

Text summary: Antarctica/Syowa shifted between 2 distinct offsets from 1957-01-29 through the modern era.

Complete Transition History (1 Transitions)

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1957-01-29T00:00:00Z`	`1957-01-29 03:00:00`	+00:00 → +03:00	`+03`	No	gap

Notes from the Maintainers

Source: backzone (Lines 950 to 961)

Syowa, Antarctica

From Hideyuki Suzuki (1999-02-06):
In all Japanese stations, +0300 is used as the standard time.

Syowa station, which is the first antarctic station of Japan,
was established on 1957-01-29.  Since Syowa station is still the main
station of Japan, it's appropriate for the principal location.
See:
NIPR Antarctic Research Activities (1999-08-17)
http://www.nipr.ac.jp/english/ara01.html

Attributed Statements:

Hideyuki Suzuki (1999-02-06):

In all Japanese stations, +0300 is used as the standard time. Syowa station, which is the first antarctic station of Japan, was established on 1957-01-29. Since Syowa station is still the main station of Japan, it's appropriate for the principal location. See: NIPR Antarctic Research Activities (1999-08-17) http://www.nipr.ac.jp/english/ara01.html

Years on Record

Methodology Note: The 1970 Rule

tzdb guarantees accuracy for timestamps from 1970 onwards. Transitions prior to 1970 represent best-effort historical reconstructions.