IST to ACST Converter
IST to ACST, made simple. ACST is 8 hours and 30 minutes ahead of IST. Change the time or date in either card and the conversion follows along instantly.
Daylight saving notes
In southern Australia, daylight saving time runs from the first Sunday in October to the first Sunday in April. That affects Australian Central Standard Time (ACST).
IST to ACST conversion chart
For example, a 9:00 AM IST meeting takes place at 5:30 PM ACST. Concretely, when Dublin (IST) and Adelaide (ACST) set up a call, aCST is 8 hours and 30 minutes ahead of IST.
| IST time | ACST time |
|---|---|
| 12:00 AM | 8:30 AM |
| 1:00 AM | 9:30 AM |
| 2:00 AM | 10:30 AM |
| 3:00 AM | 11:30 AM |
| 4:00 AM | 12:30 PM |
| 5:00 AM | 1:30 PM |
| 6:00 AM | 2:30 PM |
| 7:00 AM | 3:30 PM |
| 8:00 AM | 4:30 PM |
| 9:00 AM | 5:30 PM |
| 10:00 AM | 6:30 PM |
| 11:00 AM | 7:30 PM |
| 12:00 PM | 8:30 PM |
| 1:00 PM | 9:30 PM |
| 2:00 PM | 10:30 PM |
| 3:00 PM | 11:30 PM |
| 4:00 PM | 12:30 AM+1 day |
| 5:00 PM | 1:30 AM+1 day |
| 6:00 PM | 2:30 AM+1 day |
| 7:00 PM | 3:30 AM+1 day |
| 8:00 PM | 4:30 AM+1 day |
| 9:00 PM | 5:30 AM+1 day |
| 10:00 PM | 6:30 AM+1 day |
| 11:00 PM | 7:30 AM+1 day |
This chart uses the fixed IST and ACST offsets; the live converter above follows current daylight saving.
Convert IST to ACST Time Zone
Everything you need for IST to ACST — the difference, the current times, and how to plan around it.
Converting IST to ACST, step by step
It takes three quick steps:
- Click the IST field on the left and pick the time you want to convert.
- The matching ACST 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.
How many hours apart are IST and ACST?
ACST is 8 hours and 30 minutes ahead of IST. In everyday terms, once you know the time on one side you just add 8 hours 30 min to get the other — so a call between Dublin and Adelaide is always 8 hours 30 min apart.
What's the current time in ACST?
Right now the time in Australian Central Standard Time (ACST) is Tuesday, June 30, 2026 · 3:23:59 AM. It ticks every second, so you’re always looking at the live ACST clock.
And what time is it in IST?
And in Irish Standard Time (IST), it’s currently Monday, June 29, 2026 · 6:53:59 PM. Compare the two and the 8 hours 30 min gap is easy to see.
What's the best time for a IST–ACST call?
For example, a 9:00 AM IST meeting takes place at 5:30 PM ACST. 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 IST–ACST difference?
The labels IST and ACST 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 8 hours 30 min gap usually holds steady right through the year.
How accurate is this IST to ACST conversion?
We don’t guess. IST and ACST 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 IST 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
- 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
- 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 ACST 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
- 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
Frequently asked questions
How many hours ahead of IST is ACST?
ACST is 8 hours and 30 minutes ahead of IST — a fixed 8 hours and 30 minutes difference, since both are fixed-offset labels.
What time is it in ACST when it's 12:00 PM IST?
When it's 12:00 PM (noon) IST, it's 8:30 PM ACST.
Do IST or ACST use daylight saving time?
Irish Standard Time (IST) observes daylight saving, alternating with GMT; Australian Central Standard Time (ACST) observes daylight saving, alternating with ACDT.
Why might the real-world IST–ACST difference change during the year?
The labels IST and ACST are fixed offsets, so this converter is always exact. But Irish Standard Time's region switches between standard and summer time, so for part of the year you may actually want GMT to ACST. Always check which label a region is currently using before you schedule.