MDT to Tehran Time Converter

Updating current time…
MDT
Mountain Daylight Time
UTC−6
12am
3am
6am
9am
12pm
3pm
6pm
9pm
Tehran
IranIRST
UTC+3:30
9h 30m ahead
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

Selected conversion

6:00 am06:00 MDT (UTC-6), Oct 14, 2026 = 3:30 pm15:30 IRST (UTC+3:30), Oct 14, 2026

MDT is 9 hours and 30 minutes behind Tehran.

How the time difference changes

For most of the year, MDT is 9 hours and 30 minutes behind Tehran. From Nov 1, 2026 to Mar 14, 2027, MST is 10 hours and 30 minutes behind Tehran.

For most of the year, working hours of 9:00 am to 5:00 pm in MDT correspond to 6:30 pm to 2:30 am (next day) in Tehran. At other times of the year, working hours of 9:00 am to 5:00 pm in MST correspond to 7:30 pm to 3:30 am (next day) in Tehran.For most of the year, working hours of 09:00 to 17:00 in MDT correspond to 18:30 to 02:30 (next day) in Tehran. At other times of the year, working hours of 09:00 to 17:00 in MST correspond to 19:30 to 03:30 (next day) in Tehran.

Compare MDT time with Tehran time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Mountain Daylight Time is 9 hours and 30 minutes behind IRST (Iran Standard Time).
6:00 am06:00 in MDT is 3:30 pm15:30 in Tehran, Iran

MDT to Tehran call time
Best time for a conference call or a meeting is between 8am-9am08:00-09:00 in MDT which corresponds to 5:30pm-6:30pm17:30-18:30 in Tehran. Their 9am–5pm09:00–17:00 working hours do not overlap; this is a suggested compromise.

6:00 am06:00 Mountain Daylight Time (MDT). Offset UTC -6:00 hours
3:30 pm15:30 IRST (Iran Standard Time) (Tehran, Iran). Offset UTC +3:30 hours

6:00 am06:00 MDT / 3:30 pm15:30 Tehran, Iran

Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.

Hourly time comparison
MDTTehran, Iran
9:30am
10:30am
11:30am
12:30pm
1:30pm
2:30pm
3:30pm
4:30pm
5:30pm
6:30pm
7:30pm
8:30pm
9:30pm
10:30pm
11:30pm
12:30am next day
1:30am next day
2:30am next day
3:30am next day
4:30am next day
5:30am next day
6:30am next day
7:30am next day
8:30am next day
09:30
10:30
11:30
12:30
13:30
14:30
15:30
16:30
17:30
18:30
19:30
20:30
21:30
22:30
23:30
00:30 next day
01:30 next day
02:30 next day
03:30 next day
04:30 next day
05:30 next day
06:30 next day
07:30 next day
08:30 next day

Mountain Daylight Time

Offset: MDT is 6 hours behind Greenwich Mean Time (GMT).

Countries using this time zone: Canada, Mexico, United States

Principal Cities: The largest city in the MDT time zone is Ciudad Juárez in Mexico, with about 1.512 million people. Other major cities in this time zone include Calgary, Edmonton, Denver, El Paso.

French: HAR - Heure Avancée des Rocheuses

Spanish: MT - Zona Pacífico

Map of the areas on Mountain Daylight Time (MDT)
MDT part of the year

Today all shaded areas are on MDT.

Open the world time zone map© OpenStreetMap

Daylight Saving: Mountain Daylight Time (MDT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Mountain Standard Time (MST).

123456789101112Start: Mountain Daylight Time (MDT) started on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.

123456789101112End: Mountain Daylight Time (MDT) ends on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the first Sunday of November.

See upcoming clock changes worldwide.

MDT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -06 - basic short
  • -0600 - basic
  • -06:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0600 - sign character (-) followed by a four digit time providing hours (06) and minutes (00) of the offset. Indicates an offset of six hours to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Sierra - Military abbreviation for MDT
  • S - short form of 'Sierra'
IANA/Olson: Reflects MDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Boise
  • America/Cambridge_Bay
  • America/Ciudad_Juarez
  • America/Denver
  • America/Edmonton
  • America/Inuvik
  • America/Shiprock
  • America/Yellowknife
  • Canada/Mountain
  • MST7MDT
  • Navajo
  • US/Mountain
Time zones with the GMT -6 offset:
  • CST - Central Standard Time
  • CT - Central Time
  • MDT - Mountain Daylight Time
  • EAST - Easter Island Standard Time
  • GALT - Galapagos Time
  • S - Sierra Time Zone

Tehran Time Zone and Facts

Time Zone

Abbreviation / Offset
IRST – Iran Standard Time, UTC+3:30 (no daylight saving time)

Tehran Facts

Country
Iran
Alternative Names
THR, Taekhran, Tahran, Techerane, Teera, Teerao, Teerã, Teerão, Tegeran, Teheran, Teherana, Teheranas, Teherano, Teherán, Teherāna, Tehran, Tehrano, Tekheran, Téhéran, de hei lan, teharan, teharana, tehelan, teheran, tehran, teirani, thran, thrn, thrwn, tihiran, tihran, Τεχεράνη, Тæхран, Тегеран, Техеран, Теҳрон, Թեհրան, טהראן, טהרן, تهران, تهرون, تِهران, تِهِرَن, تہران, طهران, ܛܗܪܐܢ, तेहरान, তেহরান, தெஹ்ரான், เตหะราน, ཏེ་ཧི་རན​།, თეირანი, ቴህራን, テヘラン, 德黑兰, 테헤란
Population
7,153,309
Currency
Rial (IRR)
Geographic Coordinates
35° 41' N Latitude / 51° 25' E Longitude
International Dialing Code
+98
More About Tehran
Tehran local time and city facts
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT