CAST — Casey Time
See what CAST means, its UTC+8 offset, where it is used in Antarctica, and how to compare it with other time zones.
Meaning and usage area
CAST stands for Casey Time and uses UTC+8. It is associated with Casey Station in Antarctica rather than a sovereign country.
No daylight saving time
CAST does not observe daylight saving time, so the offset remains UTC+8 year-round. The page reflects this fixed relationship clearly.
Convert CAST to others
Compare CAST with other time zones using the visual hour grid and hour-by-hour tables. Export schedules with ICS download or send to Google Calendar and Gmail.
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 as the base row. This is useful when you need to coordinate work across UTC+8 regions, compare schedules with teams using other offsets, or line up a meeting that must stay fixed in CAST year-round.
Add comparison cities or time zones: Click + Add City and search for the places or time zones you want to compare against CAST. A practical setup is to add major UTC+8 business centers or other same-offset entries such as Singapore Time (SGT), Hong Kong Time (HKT), or Philippine Time (PHT) when coordinating regional operations, customer support coverage, or handoffs across Asia-Pacific schedules.
Select a time range on the grid: Click Select to enter selection mode, then drag across the CAST row on the 24-hour timeline to highlight a meeting window in purple; you can adjust it with the left and right handles or move the whole block by dragging the center. For example, if you highlight a standard work block in CAST, the other rows immediately show the corresponding local times, making it easy to confirm whether a support shift, operations handoff, or partner call falls into green work-hour slots instead of yellow evening or gray night hours.
Export and share the result: After selecting a range, use the export options that appear: ICS download, Google Calendar, Gmail, Copy to clipboard, or Share link. This is especially helpful when you need to send a confirmed CAST-based schedule to a distributed team so each person sees the event in their own local time without manually converting UTC+8.
About Casey Time (CAST)
CAST stands for Casey Time. Its standard offset is UTC+8, which means local time in CAST is eight hours ahead of Coordinated Universal Time.
Casey Time does not observe daylight saving time. It has no DST counterpart, so the abbreviation remains CAST throughout the entire year instead of switching to a summer or winter variant.
CAST shares the same UTC+8 offset with several other abbreviations, including AWST, BNT, CHOT, CST, H, HKT, HOVST, IRKT, KRAST, MYT, PHT, SGT, ULAT, and WITA. That same offset can be useful for broad scheduling comparisons, but the exact local convention and label still matter when you are creating calendar invites or documenting meeting times.
CAST and Daylight Saving Time
Casey Time stays on UTC+8 all year and does not switch for daylight saving time. There is no summer-time version, no winter-time rollback, and no alternate seasonal abbreviation to account for in scheduling.
For the current year, there are no DST transition dates for CAST. That makes CAST straightforward for recurring planning because a meeting set in Casey Time remains tied to UTC+8 across all months of the year.
This fixed-offset behavior is useful for long-running schedules such as monthly operations reviews, recurring vendor calls, or shared calendars that need a stable reference point. When other time zones move in or out of daylight saving time, CAST itself does not change, so only the comparison time in those other zones may shift.
Frequently Asked Questions
What does CAST stand for?
CAST stands for Casey Time. It is a time zone abbreviation that uses a fixed offset of UTC+8 and does not change seasonally.
Because CAST does not observe daylight saving time, the abbreviation stays the same throughout the year. That makes it easier to use in recurring schedules where you want one stable reference instead of tracking a summer and winter variant.
Is CAST the same as GMT?
No. CAST is UTC+8, while GMT is UTC+0, so CAST is 8 hours ahead of GMT.
That means when it is midnight in GMT, it is 8:00 AM in CAST. For scheduling, this is a significant difference, especially for international calls, overnight operations, or calendar invites shared across multiple regions.
Which cities use CAST?
There are no principal cities listed here for CAST. When using the converter, the most reliable approach is to compare CAST directly against the specific city or time zone you need for your meeting, travel plan, or operations schedule.
This matters because many users search by city first, but CAST itself is best handled as a time standard with a fixed UTC+8 offset. In the tool, you can add the city rows you care about and view them alongside CAST on the same timeline.
What is the UTC offset for CAST?
The UTC offset for Casey Time is UTC+8. In practical terms, local time in CAST is eight hours ahead of Coordinated Universal Time.
This fixed offset is useful for planning recurring events because it does not move during the year. If you anchor a meeting in CAST, the CAST side remains constant even when another participant’s local time changes because of daylight saving rules elsewhere.
When does CAST change for daylight saving time?
CAST does not change for daylight saving time. There are no DST transition dates and no seasonal clock adjustments during the year.
That means there is no point in the calendar when CAST switches forward or backward by one hour. For project coordination, this reduces confusion because Casey Time remains on UTC+8 every day of the year.
Does CAST have a daylight saving counterpart?
No. Casey Time has no counterpart. There is no alternate abbreviation used for a daylight saving version.
Some time zones switch between standard time and daylight time labels, but CAST does not. If you see a schedule labeled CAST in January, June, or October, it still refers to the same UTC+8 time standard.
Is CAST the same as other UTC+8 abbreviations?
CAST has the same UTC+8 offset as AWST, BNT, CHOT, CST, H, HKT, HOVST, IRKT, KRAST, MYT, PHT, SGT, ULAT, and WITA. From a pure offset perspective, they align at the same hour relative to UTC.
However, the abbreviation still matters in documentation and scheduling because different organizations may expect a specific regional label. If you are sending invites, publishing support hours, or coordinating with external partners, using the correct abbreviation helps avoid ambiguity even when the offset matches.
Why is CAST useful for recurring international scheduling?
CAST is useful for recurring schedules because it stays fixed at UTC+8 and does not observe daylight saving time. That gives you a stable baseline for monthly reviews, operations windows, and repeated cross-border meetings.
This consistency is especially helpful when other participants are in regions that do change clocks seasonally. In those cases, the CAST time remains constant while the corresponding local time in the other zone may shift by an hour during the year.