ACST to NST
-13hACST
ACSTSOURCENST
NSTGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and NST on the World Map
The map below highlights the ACST (Australian Central Standard Time) and NST (Newfoundland Standard Time) timezone regions across the globe.
ACST – Australian Central Standard Time
UTC+09:30Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.
- •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.
NST – Newfoundland Standard Time
UTC-03:30Newfoundland Standard Time (NST) is a unique half-hour offset time zone in Canada, 3.5 hours behind UTC.
- •NST is one of only a few half-hour offset time zones in the world.
- •Newfoundland joined Canada in 1949 and kept its unique time zone.
- •St. John's is the easternmost city in North America.
ACST vs NST: Offsets, DST and Best Call Times
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. NST runs on Newfoundland Standard Time (NST) at UTC-03:30. That puts ACST 13 hours behind NST — a difference of -13h at the current offsets.
In practice, when it is 9:00 AM in ACST it is 8:00 PM in NST on the previous day. Midnight in ACST is 11:00 AM in NST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to NST time conversion table
| ACST (ACST) | NST (NST) | Day |
|---|---|---|
| 12:00 AM | 11:00 AM | previous day |
| 6:00 AM | 5:00 PM | previous day |
| 7:00 AM | 6:00 PM | previous day |
| 8:00 AM | 7:00 PM | previous day |
| 9:00 AM | 8:00 PM | previous day |
| 12:00 PM | 11:00 PM | previous day |
| 3:00 PM | 2:00 AM | same day |
| 5:00 PM | 4:00 AM | same day |
| 6:00 PM | 5:00 AM | same day |
| 9:00 PM | 8:00 AM | same day |
Why people convert ACST to NST time
- Scheduling a call from ACST to NST: a 10:00 AM start in ACST lands at 9:00 PM in NST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -13h gap: ACST and NST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in NST is 8:00 PM in ACST.
- Keeping family and friends in sync: knowing that 8:00 PM in ACST is 7:00 AM in NST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a -13h gap is not.
- With a -13h gap there is no shared 9-to-5 window, so alternate the early start: one week ACST takes the early slot, the next week NST does.
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 NST (Newfoundland Standard Time)
Newfoundland Standard Time (NST) is one of the few half-hour offset time zones in the world. It covers the island of Newfoundland in Canada and is 30 minutes ahead of Atlantic Standard Time. This unique offset exists because Newfoundland was an independent country until 1949.
Best time to call between ACST and NST
With a -13h offset there is no overlap inside a normal 9 AM – 5 PM day. NST opens at 9:00 AM NST, which is 8:00 PM in ACST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
ACST and NST have no shared working hours because of the -13h gap. Teams need to alternate early starts or rely on asynchronous handovers.
ACST is 13 hours behind NST (ACST UTC+09:30 → NST UTC-03:30). There is no shared 9-to-5 window, so plan around an early or late slot. 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
NST
☀ Currently in DST
Standard: UTC-03:30 · DST: UTC-02:30
Clocks fall back on Sun, Nov 1, 2026
⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between ACST and NST?
ACST (ACST, UTC+09:30) is 13 hours behind NST (NST, UTC-03:30). The gap is currently -13h.
How do I convert ACST time to NST time?
Add -13h to ACST local time. For example, 9:00 AM in ACST is 8:00 PM in NST (previous day).
What time is it in NST right now?
NST uses NST at UTC-03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -13h offset from ACST.
What is the best time to call NST from ACST?
There is no shared working-hours window because of the -13h gap. The closest option is 1:00 PM in ACST, which is 12:00 AM in NST.
Which is behind, ACST or NST?
ACST is 13 hours behind NST. When it is 12:00 PM in ACST it is 11:00 PM in NST.
Does daylight saving time affect the ACST–NST difference?
Neither zone observes daylight saving time, so the -13h offset between ACST and NST 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 NST?
Sometimes. The -13h gap is large enough that 8:00 PM or later in ACST already falls on the in NST.
What is the time difference between ACST and NST?
NST is -13h from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is NST in?
NST 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 NST timezone?
Major cities in the NST timezone include St. John's, Corner Brook, Mount Pearl.
What is the UTC offset for NST?
Newfoundland Standard Time (NST) is at UTC-03:30. During daylight saving time, it shifts to NDT.
What should I know about the NST timezone?
NST is one of only a few half-hour offset time zones in the world. Newfoundland joined Canada in 1949 and kept its unique time zone.
When is it midnight in ACST, what time is it in NST?
When it is 12:00 AM (midnight) in ACST (ACST), it is -13h later in NST (NST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More ACST time conversions
- acst to new york
- acst to london
- acst to dubai
- acst to tokyo
- acst to singapore
- acst to sydney
- acst to los angeles
- acst to paris
- acst to delhi
- acst to mumbai
- acst to berlin
- acst to hong kong
- acst to toronto
- acst to kathmandu
- new york to acst
- london to acst
- dubai to acst
- tokyo to acst
- singapore to acst
- sydney to acst
- los angeles to acst
- paris to acst
- delhi to acst
- mumbai to acst
- berlin to acst
- hong kong to acst
- toronto to acst
- kathmandu to acst
See every conversion from ACST →·See every conversion from NST →