IDT to AST Converter
Convert time between Israel Daylight Time (IDT) and Atlantic Standard Time (AST)
Israel Daylight Time (IDT)
Atlantic Standard Time (AST)
Time Difference
Atlantic Standard Time (AST) is 0 hours ahead of Israel Daylight Time (IDT)
Select Date
Select Time
Quick Reference
| IDT | AST |
|---|---|
| 05:00 | 23:00 |
| 07:00 | 01:00 |
| 09:00 | 03:00 |
| 11:00 | 05:00 |
| 13:00 | 07:00 |
| 15:00 | 09:00 |
| 17:00 | 11:00 |
| 19:00 | 13:00 |
| 21:00 | 15:00 |
| 23:00 | 17:00 |
| 01:00 | 19:00 |
| 03:00 | 21:00 |
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 IDT to AST Time Conversion
Converting time between Israel Daylight Time (IDT) and Atlantic Standard Time (AST) helps coordinate work between Tel Aviv and Jerusalem and Canada's Atlantic provinces. IDT is UTC+3 while AST is UTC-4, placing IDT 7 hours ahead of AST.
This time zone converter uses the IANA timezone database to ensure accurate calculations. Atlantic Canada switches between AST and ADT, while Israel uses IDT from late March to late October. Whether you are scheduling business calls between Tel Aviv and Halifax or coordinating with family, this converter delivers reliable results.
Common Use Cases for IDT to AST Conversion
Business & Work
- Scheduling meetings between Israeli teams and Atlantic Canadian offices
- Coordinating project deadlines across Israel and the Atlantic provinces
- Planning conference calls between Tel Aviv and Halifax
Personal & Travel
- Planning travel itineraries between Israel and Atlantic Canada
- Coordinating with family and friends in Atlantic Canada from Israel
- Scheduling virtual events for IDT and AST audiences
Time Zone Information
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)
Atlantic Standard Time (AST)
- UTC Offset: UTC-4 (UTC-3 during ADT)
- IANA Timezone: America/Halifax
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Halifax, Saint John, Moncton, Charlottetown, Fredericton
- Coverage: Canada's Atlantic provinces including Nova Scotia, New Brunswick, Prince Edward Island, and parts of Quebec
Quick Reference: IDT to AST
Remember: IDT is always 7 hours ahead of AST during Israel's daylight saving period
Frequently Asked Questions
What is the time difference between IDT and AST?
Israel Daylight Time (IDT) is UTC+3, while Atlantic Standard Time (AST) is UTC-4. IDT is 7 hours ahead of AST. When it is 12:00 PM in Tel Aviv, it is 5:00 AM in Halifax.
When does this IDT to AST conversion apply?
AST is the winter standard for Atlantic Canada (early November through mid-March). IDT applies in Israel from late March to late October. The 7-hour IDT-to-AST pairing is most relevant near DST transitions.
How does the time difference change throughout the year?
When Atlantic Canada switches to ADT (UTC-3) in March, the offset to IDT becomes 6 hours. When Israel returns to IST (UTC+2), the offset between IST and AST is 6 hours.
What are the best times for IDT-AST business calls?
A 4:00 PM call in Tel Aviv is 9:00 AM in Halifax — a comfortable late afternoon for IDT and a strong morning for AST. Afternoons in Israel align with mornings in Atlantic Canada.
Which countries/regions use AST timezone?
AST covers Canada's Atlantic provinces — Nova Scotia, New Brunswick, Prince Edward Island, and parts of Quebec — during winter. Cities include Halifax, Saint John, Moncton, Charlottetown, and Fredericton.
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.
Pro Tips
- • IDT is 7 hours ahead of AST — drop 7 hours from a Tel Aviv time to get the Halifax time.
- • Most IDT-to-AST pairings only happen around the DST transitions in late March and late October.
- • Best meeting window: 3:00–6:00 PM IDT overlaps with 8:00–11:00 AM AST.
- • During the rest of Israel's daylight saving period Atlantic Canada is on ADT, narrowing the offset to 6 hours.
- • Plan around Israel's Friday-Saturday weekend — Sunday is a working day in Israel.
- • For dates in late March or early November, double-check the DST status of both regions before scheduling.