CST to IRST Converter
Time Difference
Central Daylight Time is 8 hours and 30 minutes behind Iran Standard Time
9:30 am09:30 in CDT is 6:00 pm18:00 in IRST
CST to IRST call time
Best time for a conference call or a meeting is between 8am-10am in CST which corresponds to 5:30pm-7:30pm in IRST
9:30 am09:30 Central Daylight Time (CDT). Offset UTC -5:00 hours
6:00 pm18:00 Iran Standard Time (IRST). Offset UTC +3:30 hours
9:30 am09:30 CDT / 6:00 pm18:00 IRST
| CDT | IRST |
|---|---|
| 12am (midnight) | 8:30 am |
| 1am | 9:30 am |
| 2am | 10:30 am |
| 3am | 11:30 am |
| 4am | 12:30 pm |
| 5am | 1:30 pm |
| 6am | 2:30 pm |
| 7am | 3:30 pm |
| 8am | 4:30 pm |
| 9am | 5:30 pm |
| 10am | 6:30 pm |
| 11am | 7:30 pm |
| 12pm (noon) | 8:30 pm |
| 1pm | 9:30 pm |
| 2pm | 10:30 pm |
| 3pm | 11:30 pm |
| 4pm | 12:30 am |
| 5pm | 1:30 am |
| 6pm | 2:30 am |
| 7pm | 3:30 am |
| 8pm | 4:30 am |
| 9pm | 5:30 am |
| 10pm | 6:30 am |
| 11pm | 7:30 am |
| 0:00 | 8:30 |
| 1:00 | 9:30 |
| 2:00 | 10:30 |
| 3:00 | 11:30 |
| 4:00 | 12:30 |
| 5:00 | 13:30 |
| 6:00 | 14:30 |
| 7:00 | 15:30 |
| 8:00 | 16:30 |
| 9:00 | 17:30 |
| 10:00 | 18:30 |
| 11:00 | 19:30 |
| 12:00 | 20:30 |
| 13:00 | 21:30 |
| 14:00 | 22:30 |
| 15:00 | 23:30 |
| 16:00 | 0:30 |
| 17:00 | 1:30 |
| 18:00 | 2:30 |
| 19:00 | 3:30 |
| 20:00 | 4:30 |
| 21:00 | 5:30 |
| 22:00 | 6:30 |
| 23:00 | 7:30 |
Central Standard Time
Offset: CST is 6 hours behind Greenwich Mean Time (GMT) and is used in North America
Countries: It is used in following countries: Belize, Canada, Costa Rica, Guatemala, Honduras, Mexico, Nicaragua, El Salvador, United States
Principal Cities: The largest city in the CST timezone is Mexico City from Mexico with population about 12.294 million people. Other major cities in the area are Chicago, Houston, Iztapalapa, Ecatepec
French: HNC - Heure Normale du Centre
Spanish: CT - Tiempo Central Estándar, CT - Zona Centro
Daylight Saving: This is a standard time zone, however during summer some places switch clocks for one hour forward when daylight saving comes into effect and observe Central Daylight Time (CDT).
End: Central Standard Time (CST) has ended on Sunday, March 9, 2025 at 2:00 am local time and clocks were set one hour forward to Sunday, March 9, 2025, 3:00 am local daylight time instead. Standard time ends annually the on second Sunday of March.
Start: Central Standard Time (CST) starts on Sunday, November 2, 2025 at 2:00 am local time and clocks are set one hour back to Sunday, November 2, 2025, 1:00 am. Standard time starts annually the on first Sunday of November.
CST representations, usage and related time zones
- -06 - basic short
- -0600 - basic
- -06:00 - extended
- -0600 - sign character (-) followed by a four digit time providing hours (06) and minutes (00) of the offset. Indicates six hour and zero minutes time differences to the west of the zero meridian.
- Sierra - Military abbreviation for CST
- S - short form of 'Sierra'
- America/Bahia_Banderas
- America/Belize
- America/Chicago
- America/Chihuahua
- America/Costa_Rica
- America/El_Salvador
- America/Guatemala
- America/Indiana/Knox
- America/Indiana/Tell_City
- America/Knox_IN
- America/Managua
- America/Matamoros
- America/Menominee
- America/Merida
- America/Mexico_City
- America/Monterrey
- America/North_Dakota/Beulah
- America/North_Dakota/Center
- America/North_Dakota/New_Salem
- America/Ojinaga
- America/Rainy_River
- America/Rankin_Inlet
- America/Regina
- America/Resolute
- America/Swift_Current
- America/Tegucigalpa
- America/Winnipeg
- CST6CDT
- Canada/Central
- Canada/Saskatchewan
- Mexico/General
- US/Central
- US/Indiana-Starke
- Central Standard Time - UTC -6
- China Standard Time - UTC +8
- Cuba Standard Time - UTC -5
- Colombia Standard Time - UTC -5
- CST - Central Standard Time
- CT - Central Time
- MDT - Mountain Daylight Time
- EAST - Easter Island Standard Time
- GALT - Galapagos Time
- S - Sierra Time Zone
Iran Standard Time
Offset: IRST is 3 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia
IRST representations, usage and related time zones
- +0330 - basic
- +03:30 - extended
- +0330 - sign character (+) followed by a four digit time providing hours (03) and minutes (30) of the offset. Indicates three hour and thirty minutes time differences to the east of the zero meridian.