Australia/Perth time zone
9:53PMAWST
AWSTUTC+8+13 h vs New York (you)
No transitions: Australia/Perth stays on AWST (UTC+8).
About Australia/Perth
Australia/Perth is the IANA time zone for Western Australia (most areas) in Australia. It currently keeps Australian Western Standard Time (AWST, UTC+8) all year.
Its principal location is Perth at 31.95° S, 115.85° E.
Abbreviations in use: AWST. Offset page: UTC+8.
Rule for future years (POSIX TZ string)
AWST-8
The standard time is called AWST and is UTC+8. POSIX writes the offset with the opposite sign (west of Greenwich is positive), which is why the string says "-8". There is no daylight saving rule: the zone stays on this offset for every year after the end of its explicit transitions. Software that has no full tzdata copy, such as many embedded devices, can use this string directly as the TZ environment variable.
History of Australia/Perth since 1970
The record starts with local mean time (UTC+7:43), which ended on November 30, 1895. The first daylight saving time in the record is in 1916.
| Years | Clocks | Abbreviations |
|---|---|---|
| 1970–1973 | UTC+8 all year | AWST |
| 1974 | UTC+8 until October 27, then UTC+9 | AWST, AWDT |
| 1975 | UTC+9 until March 2, then UTC+8 | AWDT, AWST |
| 1976–1982 | UTC+8 all year | AWST |
| 1983 | UTC+8 until October 30, then UTC+9 | AWST, AWDT |
| 1984 | UTC+9 until March 4, then UTC+8 | AWDT, AWST |
| 1985–1990 | UTC+8 all year | AWST |
| 1991 | UTC+8 until November 17, then UTC+9 | AWST, AWDT |
| 1992 | UTC+9 until March 1, then UTC+8 | AWDT, AWST |
| 1993–2005 | UTC+8 all year | AWST |
| 2006 | UTC+8 until December 3, then UTC+9 | AWST, AWDT |
| 2007–2008 | UTC+8 in winter, UTC+9 in summer | AWDT, AWST |
| 2009 | UTC+9 until March 29, then UTC+8 | AWDT, AWST |
| 2010 onward | UTC+8 all year | AWST |
Before 1970
7 offset changes before 1970 in the record:
- Saturday, November 30, 1895: UTC+7:43 → UTC+8 (AWST)
- Monday, January 1, 1917: UTC+8 → UTC+9 (AWDT), daylight saving time
- Sunday, March 25, 1917: UTC+9 → UTC+8 (AWST)
- Thursday, January 1, 1942: UTC+8 → UTC+9 (AWDT), daylight saving time
- Sunday, March 29, 1942: UTC+9 → UTC+8 (AWST)
- Sunday, September 27, 1942: UTC+8 → UTC+9 (AWDT), daylight saving time
- Sunday, March 28, 1943: UTC+9 → UTC+8 (AWST)
tzdata commits to accuracy from 1970 for every zone (zone1970.tab); earlier entries are historical research and may be incomplete.
Aliases and zones with the same clock
These older or country-specific IDs are links to Australia/Perth in tzdata. Their pages redirect here: Australia/West.
Other zones that keep exactly the same time under the current rules (but have a different history): Antarctica/Casey, Asia/Hong_Kong, Asia/Irkutsk, Asia/Kuching, Asia/Macau, Asia/Makassar, Asia/Manila, Asia/Shanghai, Asia/Singapore, Asia/Taipei, Asia/Ulaanbaatar.
Places on Australia/Perth
- PerthAU
Convert Perth time
Using Australia/Perth in code
Every major platform reads the same IANA ID. Store instants in UTC and convert with the ID at display time; never store a fixed offset for a place that has daylight saving time.
// JavaScript
new Date().toLocaleString('en-US', { timeZone: 'Australia/Perth' })
# Python 3.9+
from zoneinfo import ZoneInfo
from datetime import datetime
datetime.now(ZoneInfo('Australia/Perth'))
// Java
java.time.ZonedDateTime.now(java.time.ZoneId.of("Australia/Perth"))
// Go
loc, _ := time.LoadLocation("Australia/Perth")
time.Now().In(loc)
-- PostgreSQL
SELECT now() AT TIME ZONE 'Australia/Perth';
# Shell
TZ='Australia/Perth' datePlatforms ship their own copy of tzdata and update it on their own schedule. After a rule change, outputs can differ until the platform updates; this page uses tzdata 2026f.