AST to ACDT Converter
AST to ACDT, made simple. ACDT is 14 hours and 30 minutes ahead of AST. Change the time or date in either card and the conversion follows along instantly.
Now in Halifax: 2:53:57 PM ADT
On this date Halifax observes ADT. AST is in effect during standard-time (non-summer) months.
Now in Adelaide: 3:23:57 AM ACST
On this date Adelaide observes ACST. ACDT is in effect during summer (daylight saving) months.
Daylight saving notes
In the United States and Canada, daylight saving time runs from the second Sunday in March to the first Sunday in November. That affects Atlantic Standard Time (AST).
In southern Australia, daylight saving time runs from the first Sunday in October to the first Sunday in April. That affects Australian Central Daylight Time (ACDT).
AST to ACDT conversion chart
For example, a 9:00 AM AST meeting takes place at 11:30 PM ACDT. Concretely, when Halifax (AST) and Adelaide (ACDT) set up a call, aCDT is 14 hours and 30 minutes ahead of AST.
| AST time | ACDT time |
|---|---|
| 12:00 AM | 2:30 PM |
| 1:00 AM | 3:30 PM |
| 2:00 AM | 4:30 PM |
| 3:00 AM | 5:30 PM |
| 4:00 AM | 6:30 PM |
| 5:00 AM | 7:30 PM |
| 6:00 AM | 8:30 PM |
| 7:00 AM | 9:30 PM |
| 8:00 AM | 10:30 PM |
| 9:00 AM | 11:30 PM |
| 10:00 AM | 12:30 AM+1 day |
| 11:00 AM | 1:30 AM+1 day |
| 12:00 PM | 2:30 AM+1 day |
| 1:00 PM | 3:30 AM+1 day |
| 2:00 PM | 4:30 AM+1 day |
| 3:00 PM | 5:30 AM+1 day |
| 4:00 PM | 6:30 AM+1 day |
| 5:00 PM | 7:30 AM+1 day |
| 6:00 PM | 8:30 AM+1 day |
| 7:00 PM | 9:30 AM+1 day |
| 8:00 PM | 10:30 AM+1 day |
| 9:00 PM | 11:30 AM+1 day |
| 10:00 PM | 12:30 PM+1 day |
| 11:00 PM | 1:30 PM+1 day |
This chart uses the fixed AST and ACDT offsets; the live converter above follows current daylight saving.
Convert AST to ACDT Time Zone
Below are the answers people search for most when converting Atlantic Standard Time (AST) to Australian Central Daylight Time (ACDT).
How do I convert AST to ACDT?
It takes three quick steps:
- Click the AST field on the left and pick the time you want to convert.
- The matching ACDT time updates on the right automatically — there’s no button to press.
- Need a different day? Click the date field and the result follows, rolling over if it crosses midnight.
AST vs ACDT: what's the time gap?
ACDT is 14 hours and 30 minutes ahead of AST. In everyday terms, once you know the time on one side you just add 14 hours 30 min to get the other — so a call between Halifax and Adelaide is always 14 hours 30 min apart.
What's the current time in ACDT?
Right now the time in Australian Central Daylight Time (ACDT) is Tuesday, June 30, 2026 · 4:23:57 AM. It ticks every second, so you’re always looking at the live ACDT clock.
And what time is it in AST?
And in Atlantic Standard Time (AST), it’s currently Monday, June 29, 2026 · 1:53:57 PM. Compare the two and the 14 hours 30 min gap is easy to see.
What's the best time for a AST–ACDT call?
For example, a 9:00 AM AST meeting takes place at 11:30 PM ACDT. The trick is to aim for a slot that lands inside normal working hours on both sides. Once you’ve found a time, hit Share on the converter to copy a link with the time built in — easy to send to a colleague. Juggling three or more zones? The meeting planner highlights the hours that overlap for everyone.
Does daylight saving time change the AST–ACDT difference?
The labels AST and ACDT are fixed offsets, so the result on this page is always exact. Both regions move their clocks for daylight saving on roughly the same weekends, so the 14 hours 30 min gap usually holds steady right through the year.
How accurate is this AST to ACDT conversion?
We don’t guess. AST and ACDT times are worked out from the official IANA time zone database, the trusted standard that operating systems use worldwide. Because daylight-saving rules and regional offsets do change over time, we track those updates rather than relying on a fixed number — which is exactly where many converters slip up.
Convert AST to other time zones
- UTC Coordinated Universal Time
- GMT Greenwich Mean Time
- EST Eastern Standard Time
- EDT Eastern Daylight Time
- CST Central Standard Time
- CDT Central Daylight Time
- MST Mountain Standard Time
- MDT Mountain Daylight Time
- PST Pacific Standard Time
- PDT Pacific Daylight Time
- AKST Alaska Standard Time
- AKDT Alaska Daylight Time
- HST Hawaii Standard Time
- ADT Atlantic Daylight Time
- NST Newfoundland Standard Time
- NDT Newfoundland Daylight Time
- BRT Brasília Time
- ART Argentina Time
- WET Western European Time
- WEST Western European Summer Time
- CET Central European Time
- CEST Central European Summer Time
- EET Eastern European Time
- EEST Eastern European Summer Time
- BST British Summer Time
- IST Irish Standard Time
- MSK Moscow Standard Time
- TRT Turkey Time
- WAT West Africa Time
- CAT Central Africa Time
- EAT East Africa Time
- SAST South Africa Standard Time
- GST Gulf Standard Time
- IST Israel Standard Time
- IDT Israel Daylight Time
- IST India Standard Time
- PKT Pakistan Standard Time
- BDT Bangladesh Standard Time
- ICT Indochina Time
- WIB Western Indonesian Time
- WITA Central Indonesian Time
- WIT Eastern Indonesian Time
- CST China Standard Time
- HKT Hong Kong Time
- SGT Singapore Time
- PHT Philippine Time
- JST Japan Standard Time
- KST Korea Standard Time
- AWST Australian Western Standard Time
- ACST Australian Central Standard Time
- ACDT Australian Central Daylight Time
- AEST Australian Eastern Standard Time
- AEDT Australian Eastern Daylight Time
- NZST New Zealand Standard Time
- NZDT New Zealand Daylight Time
Convert to ACDT from other time zones
- UTC Coordinated Universal Time
- GMT Greenwich Mean Time
- EST Eastern Standard Time
- EDT Eastern Daylight Time
- CST Central Standard Time
- CDT Central Daylight Time
- MST Mountain Standard Time
- MDT Mountain Daylight Time
- PST Pacific Standard Time
- PDT Pacific Daylight Time
- AKST Alaska Standard Time
- AKDT Alaska Daylight Time
- HST Hawaii Standard Time
- AST Atlantic Standard Time
- ADT Atlantic Daylight Time
- NST Newfoundland Standard Time
- NDT Newfoundland Daylight Time
- BRT Brasília Time
- ART Argentina Time
- WET Western European Time
- WEST Western European Summer Time
- CET Central European Time
- CEST Central European Summer Time
- EET Eastern European Time
- EEST Eastern European Summer Time
- BST British Summer Time
- IST Irish Standard Time
- MSK Moscow Standard Time
- TRT Turkey Time
- WAT West Africa Time
- CAT Central Africa Time
- EAT East Africa Time
- SAST South Africa Standard Time
- GST Gulf Standard Time
- IST Israel Standard Time
- IDT Israel Daylight Time
- IST India Standard Time
- PKT Pakistan Standard Time
- BDT Bangladesh Standard Time
- ICT Indochina Time
- WIB Western Indonesian Time
- WITA Central Indonesian Time
- WIT Eastern Indonesian Time
- CST China Standard Time
- HKT Hong Kong Time
- SGT Singapore Time
- PHT Philippine Time
- JST Japan Standard Time
- KST Korea Standard Time
- AWST Australian Western Standard Time
- ACST Australian Central Standard Time
- AEST Australian Eastern Standard Time
- AEDT Australian Eastern Daylight Time
- NZST New Zealand Standard Time
- NZDT New Zealand Daylight Time
Frequently asked questions
How many hours ahead of AST is ACDT?
ACDT is 14 hours and 30 minutes ahead of AST — a fixed 14 hours and 30 minutes difference, since both are fixed-offset labels.
What time is it in ACDT when it's 12:00 PM AST?
When it's 12:00 PM (noon) AST, it's 2:30 AM ACDT the next day.
Do AST or ACDT use daylight saving time?
Atlantic Standard Time (AST) observes daylight saving, alternating with ADT; Australian Central Daylight Time (ACDT) observes daylight saving, alternating with ACST.
Why might the real-world AST–ACDT difference change during the year?
The labels AST and ACDT are fixed offsets, so this converter is always exact. But Atlantic Standard Time's region switches between standard and summer time, so for part of the year you may actually want ADT to ACDT. Always check which label a region is currently using before you schedule.