ACST to IDT Converter
Convert time between Australian Central Standard Time (ACST) and Israel Daylight Time (IDT)
Australian Central Standard Time (ACST)
Israel Daylight Time (IDT)
Time Difference
Israel Daylight Time (IDT) is 0 hours ahead of Australian Central Standard Time (ACST)
Select Date
Select Time
Quick Reference
| ACST | IDT |
|---|---|
| 11:30 | 05:00 |
| 13:30 | 07:00 |
| 15:30 | 09:00 |
| 17:30 | 11:00 |
| 19:30 | 13:00 |
| 21:30 | 15:00 |
| 23:30 | 17:00 |
| 01:30 | 19:00 |
| 03:30 | 21:00 |
| 05:30 | 23:00 |
| 07:30 | 01:00 |
| 09:30 | 03:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
About ACST to IDT Time Conversion
Converting time between Australian Central Standard Time (ACST) and Israel Daylight Time (IDT) helps coordinate work and travel between South Australia, the Northern Territory, and Israel. ACST is UTC+9:30 while IDT is UTC+3, placing ACST 6 hours and 30 minutes ahead of IDT — an unusual half-hour offset that requires careful attention when scheduling meetings.
This time zone converter uses the IANA timezone database to ensure accurate calculations, accounting for daylight saving in both regions. South Australia switches between ACST and ACDT, while Israel observes IDT from late March to late October before reverting to IST. Whether scheduling business calls between Adelaide and Tel Aviv or planning travel to Jerusalem, this converter provides reliable results.
Common Use Cases for ACST to IDT Conversion
Business & Work
- Scheduling meetings between Adelaide-based teams and Israeli technology partners
- Coordinating project deadlines across Australia and Israel
- Planning conference calls between South Australia and Tel Aviv during Israel's daylight saving period
Personal & Travel
- Planning travel itineraries between Australia and Israel
- Coordinating with family and friends in Israel from South Australia
- Scheduling virtual events for Australian Central and Israeli audiences
Time Zone Information
Australian Central Standard Time (ACST)
- UTC Offset: UTC+9:30 (UTC+10:30 during ACDT)
- IANA Timezone: Australia/Adelaide
- Daylight Saving: First Sunday in October to First Sunday in April (South Australia only)
- Major Cities: Adelaide, Darwin, Alice Springs, Broken Hill
- Coverage: South Australia and the Northern Territory; Darwin remains on ACST year-round, Adelaide switches to ACDT in summer
Israel Daylight Time (IDT)
- UTC Offset: UTC+3 (UTC+2 during IST)
- IANA Timezone: Asia/Jerusalem
- Daylight Saving: Friday before last Sunday in March to last Sunday in October
- Major Cities: Tel Aviv, Jerusalem, Haifa, Eilat, Beersheba
- Coverage: All of Israel during daylight saving period (late March to late October)
Quick Reference: ACST to IDT
Remember: ACST is always 6 hours 30 minutes ahead of IDT during Israel's daylight saving period
Frequently Asked Questions
What is the time difference between ACST and IDT?
Australian Central Standard Time (ACST) is UTC+9:30, while Israel Daylight Time (IDT) is UTC+3. ACST is 6 hours and 30 minutes ahead of IDT. When it is 12:00 PM in Adelaide, it is 5:30 AM in Tel Aviv.
When does this ACST to IDT conversion apply?
This 6.5-hour offset applies during Israel's daylight saving period, which runs from the Friday before the last Sunday in March until the last Sunday in October. Outside that window Israel uses IST (UTC+2) and the offset becomes 7.5 hours.
How does the time difference change throughout the year?
Both regions have their own daylight saving rules. South Australia uses ACDT (UTC+10:30) from October to April, while the Northern Territory stays on ACST year-round. Israel switches to IDT from late March to late October. As a result, the offset can be 6.5, 7.5, or 8.5 hours depending on the season.
What are the best times for ACST-IDT business calls?
A 4:00 PM call in Adelaide is 9:30 AM in Tel Aviv — a comfortable late-afternoon slot for ACST and a good morning slot for IDT. Mornings in Israel align with afternoons in central Australia, giving a useful overlap window for live calls.
Which countries/regions use IDT timezone?
IDT is observed throughout Israel, including Tel Aviv, Jerusalem, Haifa, Eilat, and Beersheba. It is the daylight saving variant of Israel Standard Time and is used by businesses, government, and transportation across the country.
Which countries/regions use ACST timezone?
ACST covers South Australia and the Northern Territory in Australia. Cities include Adelaide, Darwin, and Alice Springs. Adelaide switches to ACDT in summer; Darwin stays on ACST year-round.
Pro Tips
- • ACST is 6.5 hours ahead of IDT — drop 6.5 hours from an Adelaide time to get the Tel Aviv time.
- • Israel observes IDT from late March to late October; outside that window the offset becomes 7.5 hours (IST).
- • Best meeting window: 3:00–5:00 PM ACST overlaps with 8:30–10:30 AM IDT — late afternoon for one side, morning for the other.
- • Adelaide switches to ACDT in October, narrowing the offset to 5.5 hours during overlapping DST.
- • Northern Territory cities like Darwin stay on ACST year-round, so they keep the 6.5-hour offset to IDT.
- • Israel observes Friday-Saturday weekends — schedule cross-region calls Monday through Thursday.