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ACST to EEST

-6h 30m

ACST

ACSTSOURCE
UTC+09:30DST observed
HH12
:
MM00
  
12:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM

EEST

EEST
UTC+03:00☀ DST active
HH05
:
MM30
  
05:30 (24-hr)
12 AM6 AM12 PM6 PM12 AM
ACST
EEST
12:00 AM
5:30 PM-1
2:00 AM
7:30 PM-1
4:00 AM
9:30 PM-1
6:00 AM
11:30 PM-1
8:00 AM
1:30 AM
10:00 AM
3:30 AM
12:00 PM
5:30 AM
2:00 PM
7:30 AM
4:00 PM
9:30 AM
6:00 PM
11:30 AM
8:00 PM
1:30 PM
10:00 PM
3:30 PM

Green rows indicate typical business hours (9 AM - 5 PM)

ACST and EEST on the World Map

The map below highlights the ACST (Australian Central Standard Time) and EEST (Eastern European Summer Time) timezone regions across the globe.

ACSTEESTAdelaideDarwinAlice SpringsMount GambierAthensHelsinkiBucharestSofia
ACST Zone
→
EEST Zone

Explore all world timezones interactively →

ACST – Australian Central Standard Time

UTC+09:30

Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.

Countries in ACST
Australia (South Australia, Northern Territory)
Major Cities in ACST
AdelaideDarwinAlice SpringsMount Gambier
Key Facts about ACST
  • •ACST uses a half-hour offset: UTC+09:30.
  • •South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
  • •Adelaide and Darwin are 30 minutes apart during daylight saving, level in winter.
  • •Adelaide is one of the few major cities on a 30-minute offset.
Daylight Saving:Yes – switches to ACDT
Learn more about ACST on Wikipedia

EEST – Eastern European Summer Time

UTC+03:00

Eastern European Summer Time (EEST, UTC+03:00) is the daylight saving period across eastern Europe, from late March to late October.

Countries in EEST
GreeceFinlandRomaniaBulgariaEstoniaLatviaLithuaniaUkraineMoldovaCyprus
Major Cities in EEST
AthensHelsinkiBucharestSofiaKyivRiga
Key Facts about EEST
  • •EEST runs from the last Sunday in March to the last Sunday in October.
  • •EEST is one hour ahead of Eastern European Time (EET, UTC+02:00).
  • •During EEST, eastern Europe is level with Moscow, Istanbul and Riyadh.
  • •EEST follows the EU-wide summer time schedule.
Daylight Saving:Yes – switches to EEST
Learn more about EEST on Wikipedia

Time Conversion Guide: ACST to EEST

ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. EEST runs on Eastern European Summer Time (EEST) at UTC+03:00. That puts ACST 6 hours 30 minutes behind EEST — a difference of -6h 30m at the current offsets.

In practice, when it is 9:00 AM in ACST it is 2:30 AM in EEST. Midnight in ACST is 5:30 PM in EEST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

ACST to EEST time conversion table

ACST (ACST)EEST (EEST)Day
12:00 AM5:30 PMprevious day
6:00 AM11:30 PMprevious day
7:00 AM12:30 AMsame day
8:00 AM1:30 AMsame day
9:00 AM2:30 AMsame day
12:00 PM5:30 AMsame day
3:00 PM8:30 AMsame day
5:00 PM10:30 AMsame day
6:00 PM11:30 AMsame day
9:00 PM2:30 PMsame day

Why people convert ACST to EEST time

  • Scheduling a call from ACST to EEST: a 10:00 AM start in ACST lands at 3:30 AM in EEST, so you can confirm the slot without doing the arithmetic yourself.
  • Finding shared working hours: both ACST and EEST are inside the 9-to-5 working day between 3:30 PM and 5:00 PM ACST time (9:00 AM–10:30 AM EEST). That is roughly 1 hours 30 minutes of usable overlap.
  • Watching a live event or market open: ACST viewers need 2:30 AM in EEST to catch a 9:00 AM start there, and 6:30 AM if the event is anchored to ACST.
  • Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a -6h 30m gap is not.
  • Block 3:30 PM–5:00 PM ACST as the recurring meeting window if you work primarily from ACST and need EEST colleagues present.

About ACST (Australian Central Standard Time)

Australian Central Standard Time (ACST) is the half-hour offset of UTC+09:30 used across South Australia and the Northern Territory, taking in Adelaide and Darwin. South Australia moves to Australian Central Daylight Time (ACDT, UTC+10:30) from the first Sunday in October to the first Sunday in April, but the Northern Territory does not observe daylight saving — so Adelaide and Darwin sit 30 minutes apart in summer and level with each other in winter. The half-hour offset means Adelaide is 30 minutes behind Sydney in winter and level with it during daylight saving, which regularly catches out travellers and meeting planners.

About EEST (Eastern European Summer Time)

Eastern European Summer Time (EEST) is the daylight saving period used across eastern Europe, when clocks move one hour forward from Eastern European Time (EET, UTC+02:00) to UTC+03:00. It runs from the last Sunday in March to the last Sunday in October, in step with the rest of the European Union. EEST covers Greece, Finland, Romania, Bulgaria, the Baltic states, Ukraine and Moldova, and matches the offset used year-round by Moscow, Istanbul and Riyadh during those months. Athens and Helsinki both sit near the western edge of the EEST band, so summer evenings stay light well past 21:00.

Best time to call between ACST and EEST

Both ACST and EEST sit inside the 9 AM – 5 PM working day between 3:30 PM–5:00 PM ACST, which is 9:00 AM–10:30 AM EEST. That gives roughly 1 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

ACST and EEST overlap for only 90 minutes (3:30 PM–5:00 PM ACST), so meetings have to be booked precisely.

ACST is 6 hours 30 minutes behind EEST (ACST UTC+09:30 → EEST UTC+03:00). The shared working window is 3:30 PM–5:00 PM ACST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

ACST

❄ Currently in Standard Time

Standard: UTC+09:30 · DST: UTC+10:30

Clocks spring forward on Sat, Oct 3, 2026

EEST

☀ Currently in DST

Standard: UTC+02:00 · DST: UTC+03:00

Clocks fall back on Sun, Oct 25, 2026

⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.

Frequently Asked Questions

What is the time difference between ACST and EEST?

ACST (ACST, UTC+09:30) is 6 hours 30 minutes behind EEST (EEST, UTC+03:00). The gap is currently -6h 30m.

How do I convert ACST time to EEST time?

Add -6h 30m to ACST local time. For example, 9:00 AM in ACST is 2:30 AM in EEST.

What time is it in EEST right now?

EEST uses EEST at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h 30m offset from ACST.

What is the best time to call EEST from ACST?

Call between 3:30 PM and 5:00 PM ACST — that maps to 9:00 AM–10:30 AM EEST and keeps both parties inside the working day.

Which is behind, ACST or EEST?

ACST is 6 hours 30 minutes behind EEST. When it is 12:00 PM in ACST it is 5:30 AM in EEST.

Does daylight saving time affect the ACST–EEST difference?

Neither zone observes daylight saving time, so the -6h 30m offset between ACST and EEST is fixed all year.

Which other cities share ACST's time zone?

ACST also covers Adelaide, Darwin, Alice Springs, Mount Gambier.

Which countries use ACST, ACST's zone?

ACST is used in Australia (South Australia, Northern Territory).

Is there a day difference between ACST and EEST?

Not normally. The -6h 30m gap only pushes the date over the previous day.

What is the time difference between ACST and EEST?

EEST is -6h 30m from ACST.

What timezone is ACST in?

ACST operates on its local timezone.

What timezone is EEST in?

EEST operates on its local timezone.

Which countries use ACST (Australian Central Standard Time)?

ACST is used in Australia (South Australia, Northern Territory).

Does ACST observe daylight saving time?

Yes, ACST switches to ACDT during summer months.

What are some interesting facts about ACST?

ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.

Which cities are in the EEST timezone?

Major cities in the EEST timezone include Athens, Helsinki, Bucharest, Sofia, Kyiv, Riga.

What is the UTC offset for EEST?

Eastern European Summer Time (EEST) is at UTC+03:00. During daylight saving time, it shifts to EEST.

What should I know about the EEST timezone?

EEST runs from the last Sunday in March to the last Sunday in October. EEST is one hour ahead of Eastern European Time (EET, UTC+02:00).

When is it midnight in ACST, what time is it in EEST?

When it is 12:00 AM (midnight) in ACST (ACST), it is -6h 30m later in EEST (EEST).