IDT to MST Converter
Convert time between Israel Daylight Time (IDT) and Mountain Standard Time (MST)
Israel Daylight Time (IDT)
Mountain Standard Time (MST)
Time Difference
Mountain Standard Time (MST) is 0 hours ahead of Israel Daylight Time (IDT)
Select Date
Select Time
Quick Reference
| IDT | MST |
|---|---|
| 05:00 | 20:00 |
| 07:00 | 22:00 |
| 09:00 | 00:00 |
| 11:00 | 02:00 |
| 13:00 | 04:00 |
| 15:00 | 06:00 |
| 17:00 | 08:00 |
| 19:00 | 10:00 |
| 21:00 | 12:00 |
| 23:00 | 14:00 |
| 01:00 | 16:00 |
| 03:00 | 18:00 |
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 MST Time Conversion
Converting time between Israel Daylight Time (IDT) and Mountain Standard Time (MST) helps coordinate work between Tel Aviv, Jerusalem, and US Mountain cities like Phoenix, Denver in winter, and Salt Lake City. IDT is UTC+3 while MST is UTC-7, placing IDT 10 hours ahead of MST.
This time zone converter uses the IANA timezone database to ensure accurate calculations. MST is the winter standard time in most of the US Mountain region, but Arizona uses MST year-round (without DST). Israel uses IDT from late March to late October. For most of Israel's daylight saving period, the US Mountain region is on MDT (9 hours behind IDT) — except Arizona, which stays on MST.
Common Use Cases for IDT to MST Conversion
Business & Work
- Scheduling meetings between Israeli teams and Arizona or US Mountain time partners
- Coordinating project deadlines across Israel and the US Mountain region
- Planning conference calls between Tel Aviv and Phoenix
Personal & Travel
- Planning travel itineraries between Israel and the US Mountain region
- Coordinating with family and friends in US Mountain states from Israel
- Scheduling virtual events for IDT and MST 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)
Mountain Standard Time (MST)
- UTC Offset: UTC-7 (UTC-6 during MDT)
- IANA Timezone: America/Denver
- Daylight Saving: First Sunday in November to Second Sunday in March (most of region); Arizona stays on MST year-round
- Major Cities: Phoenix, Denver, Salt Lake City, Albuquerque, El Paso
- Coverage: US Mountain time zone during winter standard time, plus Arizona year-round
Quick Reference: IDT to MST
Remember: IDT is always 10 hours ahead of MST. Arizona stays on MST year-round, so use this offset for Phoenix; the rest of the US Mountain region uses MDT during Israel's daylight saving period (9-hour offset)
Frequently Asked Questions
What is the time difference between IDT and MST?
Israel Daylight Time (IDT) is UTC+3, while Mountain Standard Time (MST) is UTC-7. IDT is 10 hours ahead of MST. When it is 12:00 PM in Tel Aviv, it is 2:00 AM in Phoenix.
When does this IDT to MST conversion apply?
MST is the winter standard time in most of the US Mountain region (early November to mid-March), but Arizona uses MST year-round. IDT applies in Israel from late March to late October. So the 10-hour offset is most relevant for Arizona during Israel's daylight saving period, and across the Mountain region near DST transitions.
How does the time difference change throughout the year?
When the US Mountain region (excluding Arizona) switches to MDT (UTC-6) in March, the offset to IDT narrows to 9 hours. Arizona stays on MST year-round, so it keeps the 10-hour offset throughout Israel's daylight saving period.
What are the best times for IDT-MST business calls?
A 7:00 PM call in Tel Aviv is 9:00 AM in Phoenix — workable as an evening for IDT and a strong morning for MST. Beyond about 9:00 PM IDT the live overlap closes.
Which countries/regions use MST timezone?
MST covers the US Mountain time zone during winter and Arizona year-round. Cities include Phoenix, Denver, Salt Lake City, Albuquerque, and El Paso. Most of the region switches to MDT in summer; Arizona stays on MST.
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 10 hours ahead of MST — drop 10 hours from a Tel Aviv time to get the Phoenix time.
- • Arizona stays on MST year-round — for Phoenix this 10-hour offset holds throughout Israel's daylight saving period.
- • Best meeting window: 6:00–8:00 PM IDT overlaps with 8:00–10:00 AM MST.
- • For most of the US Mountain region, MDT (9-hour offset) applies during Israel's daylight saving period.
- • Plan around Israel's Friday-Saturday weekend — Sunday is a working day in Israel.
- • Around DST transitions in March and November, double-check the offset before sending invites.