HST to IDT Converter
Convert time between Hawaii Standard Time (HST) and Israel Daylight Time (IDT)
Hawaii Standard Time (HST)
Israel Daylight Time (IDT)
Time Difference
Israel Daylight Time (IDT) is 0 hours ahead of Hawaii Standard Time (HST)
Select Date
Select Time
Quick Reference
| HST | IDT |
|---|---|
| 16:00 | 05:00 |
| 18:00 | 07:00 |
| 20:00 | 09:00 |
| 22:00 | 11:00 |
| 00:00 | 13:00 |
| 02:00 | 15:00 |
| 04:00 | 17:00 |
| 06:00 | 19:00 |
| 08:00 | 21:00 |
| 10:00 | 23:00 |
| 12:00 | 01:00 |
| 14:00 | 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 HST to IDT Time Conversion
Converting time between Hawaii Standard Time (HST) and Israel Daylight Time (IDT) bridges Honolulu, Hilo, and Kailua-Kona with Tel Aviv and Jerusalem. HST is UTC-10 while IDT is UTC+3, placing IDT 13 hours ahead of HST — almost a half-day difference that reliably crosses the date line.
This time zone converter uses the IANA timezone database to ensure accurate calculations. Hawaii does not observe daylight saving, so HST is constant year-round. Israel uses IDT from late March to late October. Whether you are scheduling business calls or coordinating with family, this converter delivers reliable results.
Common Use Cases for HST to IDT Conversion
Business & Work
- Scheduling meetings between Hawaii-based teams and Israeli partners
- Coordinating project deadlines across Hawaii and Israel
- Planning conference calls between Honolulu and Tel Aviv
Personal & Travel
- Planning travel itineraries between Hawaii and Israel
- Coordinating with family and friends in Israel from Hawaii
- Scheduling virtual events for HST and IDT audiences
Time Zone Information
Hawaii Standard Time (HST)
- UTC Offset: UTC-10
- IANA Timezone: Pacific/Honolulu
- Daylight Saving: None - HST is constant year-round
- Major Cities: Honolulu, Hilo, Kailua-Kona, Kaneohe, Pearl City
- Coverage: Hawaiian Islands
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: HST to IDT
Remember: IDT is always 13 hours ahead of HST during Israel's daylight saving period
Frequently Asked Questions
What is the time difference between HST and IDT?
Hawaii Standard Time (HST) is UTC-10, while Israel Daylight Time (IDT) is UTC+3. IDT is 13 hours ahead of HST. When it is 12:00 PM in Honolulu, it is 1:00 AM in Tel Aviv the next day.
When does this HST to IDT conversion apply?
HST is constant year-round (Hawaii does not observe DST). IDT applies in Israel from late March to late October — so the 13-hour offset applies during that window. Outside it, when Israel uses IST (UTC+2), the offset becomes 12 hours.
How does the time difference change throughout the year?
HST never changes. The only shift comes from Israel: when Israel transitions to IST in late October, the offset between HST and IST is 12 hours.
What are the best times for HST-IDT business calls?
A 7:00 PM call in Honolulu is 8:00 AM next day in Tel Aviv — the only realistic live overlap. Asynchronous communication is generally easier for this pair given the 13-hour gap.
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 nationwide.
Which countries/regions use HST timezone?
HST is observed across the Hawaiian Islands, including Honolulu, Hilo, Kailua-Kona, Kaneohe, and Pearl City. Hawaii does not observe daylight saving time.
Pro Tips
- • IDT is 13 hours ahead of HST — almost a complete half-day difference, often crossing into the next day.
- • HST never changes (no DST), so the offset shifts only when Israel transitions between IDT and IST.
- • Best meeting window: 6:00–9:00 PM HST overlaps with 7:00–10:00 AM IDT next day.
- • When Israel switches to IST in late October, the offset narrows to 12 hours.
- • Plan around Israel's Friday-Saturday weekend — Sunday is a working day in Israel.
- • Asynchronous communication generally works better than live calls for the HST-IDT pair.