IRST to KST Converter
Quick answers
IRST is 5 hours and 30 minutes behind KST. IRST uses GMT +3:30, and KST uses GMT +9 for this comparison.
For example, 3:30 pm IRST is 9:00 pm KST. Use the converter above to adjust the date or time and create a shareable meeting link.
Best meeting overlap: 9am-11:30am IRST, which is 2:30pm-5pm KST.
Compare IRST time with KST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Iran Standard Time is 5 hours and 30 minutes behind Korea Standard Time
3:30 pm15:30 in IRST is 9:00 pm21:00 in KST
IRST to KST call time
Best time for a conference call or a meeting is between 9am-11:30am in IRST which corresponds to 2:30pm-5pm in KST
3:30 pm15:30 Iran Standard Time (IRST). Offset UTC +3:30 hours
9:00 pm21:00 Korea Standard Time (KST). Offset UTC +9:00 hours
3:30 pm15:30 IRST / 9:00 pm21:00 KST
| IRST | KST |
|---|---|
| 12am (midnight) | 5:30 am |
| 1am | 6:30 am |
| 2am | 7:30 am |
| 3am | 8:30 am |
| 4am | 9:30 am |
| 5am | 10:30 am |
| 6am | 11:30 am |
| 7am | 12:30 pm |
| 8am | 1:30 pm |
| 9am | 2:30 pm |
| 10am | 3:30 pm |
| 11am | 4:30 pm |
| 12pm (noon) | 5:30 pm |
| 1pm | 6:30 pm |
| 2pm | 7:30 pm |
| 3pm | 8:30 pm |
| 4pm | 9:30 pm |
| 5pm | 10:30 pm |
| 6pm | 11:30 pm |
| 7pm | 12:30 am |
| 8pm | 1:30 am |
| 9pm | 2:30 am |
| 10pm | 3:30 am |
| 11pm | 4:30 am |
| 00:00 | 05:30 |
| 01:00 | 06:30 |
| 02:00 | 07:30 |
| 03:00 | 08:30 |
| 04:00 | 09:30 |
| 05:00 | 10:30 |
| 06:00 | 11:30 |
| 07:00 | 12:30 |
| 08:00 | 13:30 |
| 09:00 | 14:30 |
| 10:00 | 15:30 |
| 11:00 | 16:30 |
| 12:00 | 17:30 |
| 13:00 | 18:30 |
| 14:00 | 19:30 |
| 15:00 | 20:30 |
| 16:00 | 21:30 |
| 17:00 | 22:30 |
| 18:00 | 23:30 |
| 19:00 | 00:30 |
| 20:00 | 01:30 |
| 21:00 | 02:30 |
| 22:00 | 03:30 |
| 23:00 | 04:30 |
Iran Standard Time
Offset: IRST is 3 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia
Countries using this time zone: Iran
Principal Cities: The largest city in the IRST time zone is Tehran in Iran, with about 7.153 million people. Other major cities in this time zone include Mashhad, Isfahan, Karaj, Tabriz.
Daylight Saving: Clocks in Iran Standard Time (IRST) do not change for daylight saving time, so IRST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter.
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 an offset of three hours and thirty minutes to the east of the zero meridian.
Korea Standard Time
Offset: KST is 9 hours ahead Greenwich Mean Time (GMT) and is used in Asia
Countries using this time zone: Korea (North), Korea (South)
Principal Cities: The largest city in the KST time zone is Seoul in South Korea, with about 10.349 million people. Other major cities in this time zone include Busan, Pyongyang, Incheon, Daegu.
Daylight Saving: Clocks in Korea Standard Time (KST) do not change for daylight saving time, so KST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter.
KST representations, usage and related time zones
- +09 - basic short
- +0900 - basic
- +09:00 - extended
- +0900 - sign character (+) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates an offset of nine hours to the east of the zero meridian.
- India - Military abbreviation for KST
- I - short form of 'India'
- Asia/Pyongyang
- Asia/Seoul
- ROK
- Korea Standard Time - UTC +9
- Pyongyang Time - UTC +8:30
- AWDT - Australian Western Daylight Time
- CHOST - Choibalsan Summer Time
- I - India Time Zone
- IRKST - Irkutsk Summer Time
- JST - Japan Standard Time
- KST - Korea Standard Time
- PWT - Palau Time
- TLT - East Timor Time
- ULAST - Ulaanbaatar Summer Time
- WIT - Eastern Indonesian Time
- YAKT - Yakutsk Time