NST to ACST
+13hNST
NSTSOURCEACST
ACSTGreen rows indicate typical business hours (9 AM - 5 PM)
NST and ACST on the World Map
The map below highlights the NST (Newfoundland Standard Time) and ACST (Australian Central Standard Time) timezone regions across the globe.
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 – 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.
Time Conversion Guide: NST to ACST
NST runs on Newfoundland Standard Time (NST) at UTC-03:30. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts NST 13 hours ahead of ACST — a difference of +13h at the current offsets.
In practice, when it is 9:00 AM in NST it is 10:00 PM in ACST. Midnight in NST is 1:00 PM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
NST to ACST time conversion table
| NST (NST) | ACST (ACST) | Day |
|---|---|---|
| 12:00 AM | 1:00 PM | same day |
| 6:00 AM | 7:00 PM | same day |
| 7:00 AM | 8:00 PM | same day |
| 8:00 AM | 9:00 PM | same day |
| 9:00 AM | 10:00 PM | same day |
| 12:00 PM | 1:00 AM | next day |
| 3:00 PM | 4:00 AM | next day |
| 5:00 PM | 6:00 AM | next day |
| 6:00 PM | 7:00 AM | next day |
| 9:00 PM | 10:00 AM | next day |
Why people convert NST to ACST time
- Scheduling a call from NST to ACST: a 10:00 AM start in NST lands at 11:00 PM in ACST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +13h gap: NST and ACST 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 ACST is 10:00 PM in NST.
- Watching a live event or market open: NST viewers need 10:00 PM in ACST to catch a 9:00 AM start there, and 11:00 AM if the event is anchored to NST.
- Always state the zone abbreviation, not just the hour. "3:00 PM NST" 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 NST takes the early slot, the next week ACST does.
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.
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.
Best time to call between NST and ACST
With a +13h offset there is no overlap inside a normal 9 AM – 5 PM day. ACST opens at 9:00 AM ACST, which is 10:00 PM in NST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
NST and ACST have no shared working hours because of the +13h gap. Teams need to alternate early starts or rely on asynchronous handovers.
NST is 13 hours ahead of ACST (NST UTC-03:30 → ACST UTC+09:30). 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
NST
☀ Currently in DST
Standard: UTC-03:30 · DST: UTC-02:30
Clocks fall back on Sun, Nov 1, 2026
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 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 NST and ACST?
NST (NST, UTC-03:30) is 13 hours ahead of ACST (ACST, UTC+09:30). The gap is currently +13h.
How do I convert NST time to ACST time?
Add +13h to NST local time. For example, 9:00 AM in NST is 10:00 PM in ACST.
What time is it in ACST right now?
ACST uses ACST at UTC+09:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +13h offset from NST.
What is the best time to call ACST from NST?
There is no shared working-hours window because of the +13h gap. The closest option is 1:00 PM in NST, which is 2:00 AM in ACST.
Which is ahead, NST or ACST?
NST is 13 hours ahead of ACST. When it is 12:00 PM in NST it is 1:00 AM in ACST.
Does daylight saving time affect the NST–ACST difference?
Neither zone observes daylight saving time, so the +13h offset between NST and ACST is fixed all year.
Which other cities share NST's time zone?
NST also covers St. John's, Corner Brook, Mount Pearl.
Which countries use NST, NST's zone?
NST is used in Canada (Newfoundland).
Is there a day difference between NST and ACST?
Sometimes. The +13h gap is large enough that 8:00 PM or later in NST already falls on the next day in ACST.
What is the time difference between NST and ACST?
ACST is +13h from NST.
What timezone is NST in?
NST operates on its local timezone.
What timezone is ACST in?
ACST operates on its local timezone.
Which countries use NST (Newfoundland Standard Time)?
NST is used in Canada (Newfoundland).
Does NST observe daylight saving time?
Yes, NST switches to NDT during summer months.
What are some interesting facts about NST?
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.
Which cities are in the ACST timezone?
Major cities in the ACST timezone include Adelaide, Darwin, Alice Springs, Mount Gambier.
What is the UTC offset for ACST?
Australian Central Standard Time (ACST) is at UTC+09:30. During daylight saving time, it shifts to ACDT.
What should I know about the ACST timezone?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
When is it midnight in NST, what time is it in ACST?
When it is 12:00 AM (midnight) in NST (NST), it is +13h later in ACST (ACST).
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