CAST — Casey Time
See current Casey Time, understand its UTC+8 offset, and compare CAST with other time zones worldwide.
How to Convert CAST to Other Time Zones
Open the CAST converter page: Go to https://www.xconvert.com/time-converter/cast-time-zone to load the visual comparison grid with Casey Time (CAST) already shown at UTC+08:00. This page is useful when you need to line up work with stations, research teams, or logistics contacts operating on Casey Station time in Antarctica, especially because CAST stays fixed while many other regions change for daylight saving during the year.
Add the cities or time zones you need to compare: Click + Add City and add practical comparison locations such as Perth for Australian business coordination, Singapore for shipping and regional operations, and London or New York for international calls. This is especially helpful for polar research support, aviation planning, and global project teams, because CAST is 8 hours ahead of UTC, the same as Perth and Singapore year-round, but 8 hours ahead of London in winter and 7 hours ahead in British Summer Time.
Drag across the grid to select a meeting window: Click Select if needed, then drag across the CAST row to highlight a time block in purple; you can resize it with the left and right handles or move the whole block by dragging the center. For example, if you drag 09:00 to 11:00 CAST, that corresponds to 09:00 to 11:00 in Perth and Singapore, 01:00 to 03:00 UTC, 01:00 to 03:00 in London during winter, and 02:00 to 04:00 in London during summer, which quickly shows whether a Casey morning overlaps with support teams elsewhere.
Export and share the selected time range: Once your purple selection is active, use the export options for ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. That makes it easy to send a confirmed handover window to a distributed operations team, attach an ICS file so calendars convert the time automatically, or paste the shared link into email or chat for collaborators in different time zones.
About Casey Time (CAST)
CAST stands for Casey Time, the local time used at Casey Station, an Australian Antarctic research station in Wilkes Land, Antarctica. Its standard offset is UTC+08:00, which means local time at Casey is 8 hours ahead of Coordinated Universal Time; when it is 12:00 UTC, it is 20:00 CAST.
Casey Station is operated by the Australian Antarctic Division, and CAST is primarily associated with that station rather than with a sovereign country or a large civilian population center. Unlike broader national time zones such as AWST in Western Australia or SGT in Singapore, CAST is a specialized station time used for research, logistics, weather observation, engineering support, and seasonal expedition coordination in Antarctica.
Because CAST is UTC+8, it matches the same clock offset used by several other abbreviations and regions, including AWST, BNT, HKT, MYT, PHT, SGT, and WITA, although those abbreviations refer to different places and should not be treated as interchangeable labels. In practical scheduling, this means a call set for 15:00 CAST is also 15:00 in Perth, Singapore, Hong Kong, Manila, and Kuala Lumpur on the same date, but users should still label invitations carefully to avoid confusion between region-specific abbreviations.
CAST and Daylight Saving Time
Casey Time does not currently observe daylight saving time, so the DST status is false and the working offset remains UTC+08:00 throughout the year. For the current year, 2026, there are no daylight saving transition dates, no seasonal clock changes, and no switch to an alternate summer abbreviation.
That fixed offset is useful for long-range planning because CAST does not jump forward or backward by an hour. However, your comparison cities may still change: for example, London moves to British Summer Time on 29 March 2026 and returns to Greenwich Mean Time on 25 October 2026, while New York moves to EDT on 8 March 2026 and back to EST on 1 November 2026. So a meeting that is 08:00 CAST / 00:00 UTC will line up differently with DST-observing locations depending on the month, even though CAST itself never changes.
This matters for real scheduling windows. A 10:00 CAST operations check-in is 02:00 in London in January but 03:00 in London in July; it is 21:00 in New York on the previous day during standard time and 22:00 on the previous day during daylight time. If you are coordinating Antarctic logistics, satellite communications, or research support with offices outside Antarctica, checking the exact date on the converter avoids seasonal one-hour mistakes.
Frequently Asked Questions
What does CAST stand for?
CAST stands for Casey Time, the time standard used at Casey Station in Antarctica. Casey Station is an Australian-operated research base, so the abbreviation is tied to station operations, scientific activity, and expedition logistics rather than to a large metropolitan region.
Is CAST the same as GMT?
No. CAST is UTC+08:00, while GMT is UTC+00:00, so CAST is 8 hours ahead of GMT. If it is 09:00 GMT, it is 17:00 CAST, which is a major difference for scheduling calls, weather briefings, or supply-chain coordination.
Which cities use CAST?
CAST is not a city-based civilian time zone and does not have principal cities in the usual sense. It is associated with Casey Station, Antarctica, so most people searching for cities that “use CAST” are really looking for the Antarctic research station itself rather than urban population centers like Perth or Singapore.
What is the UTC offset for CAST?
The exact UTC offset for CAST is UTC+08:00. That means you add 8 hours to UTC to get Casey Time; for example, 04:30 UTC becomes 12:30 CAST on the same calendar day.
When does CAST change?
CAST does not currently change for daylight saving time, so there are no DST switch dates in 2026. The offset remains UTC+8 all year, which makes it more predictable than time zones in Europe or North America that shift once in spring and once in autumn.
Is CAST the same as AWST or Singapore Time?
CAST shares the same UTC+08:00 offset as AWST and Singapore Time (SGT), so the clock time is the same at any given moment. However, the abbreviations refer to different places and administrative contexts: CAST is for Casey Station in Antarctica, AWST is used in Western Australia, and SGT is used in Singapore.
How far ahead is CAST from UTC?
CAST is 8 hours ahead of UTC every day of the year. So when it is 00:00 UTC, it is 08:00 CAST, and when it is 18:00 UTC, it is 02:00 CAST on the next day.
Why is CAST useful to compare with Perth, Singapore, or Hong Kong?
Those locations all operate on UTC+08:00 for most or all of the year, so they provide an easy same-offset reference when checking whether a Casey Station schedule aligns with Asia-Pacific business hours. For example, a 14:00 CAST coordination call is also 14:00 in Perth, Singapore, Hong Kong, Kuala Lumpur, and Manila, which simplifies planning with aviation contractors, equipment suppliers, and regional support teams.