KST to UTC Converter
Quick answers
Selected conversion
9:00 pm21:00 KST (UTC+9), Oct 4, 2026 = 12:00 pm12:00 UTC (UTC+0), Oct 4, 2026
KST is 9 hours ahead of UTC.
KST and UTC examples
These examples always use KST (UTC+9) and UTC (UTC+0). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
KST is 9 hours ahead of UTC.
How the time difference changes
KST is 9 hours ahead of UTC year-round.
Working hours of 9:00 am to 5:00 pm in KST correspond to 12:00 am to 8:00 am in UTC.Working hours of 09:00 to 17:00 in KST correspond to 00:00 to 08:00 in UTC.
Compare KST time with UTC time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Korea Standard Time is 9 hours ahead of Universal Time Coordinated.
9:00 pm21:00 in KST is 12:00 pm12:00 in UTC
KST to UTC call time
Best time for a conference call or a meeting is between 5pm-6pm17:00-18:00 in KST which corresponds to 8am-9am08:00-09:00 in UTC
9:00 pm21:00 Korea Standard Time (KST). Offset UTC +9:00 hours
12:00 pm12:00 Universal Time Coordinated (UTC). Offset UTC 0:00 hours
9:00 pm21:00 KST / 12:00 pm12:00 UTC
| KST | UTC |
|---|---|
| 12:00am | 3:00pm |
| 1:00am | 4:00pm |
| 2:00am | 5:00pm |
| 3:00am | 6:00pm |
| 4:00am | 7:00pm |
| 5:00am | 8:00pm |
| 6:00am | 9:00pm |
| 7:00am | 10:00pm |
| 8:00am | 11:00pm |
| 9:00am | 12:00am |
| 10:00am | 1:00am |
| 11:00am | 2:00am |
| 12:00pm | 3:00am |
| 1:00pm | 4:00am |
| 2:00pm | 5:00am |
| 3:00pm | 6:00am |
| 4:00pm | 7:00am |
| 5:00pm | 8:00am |
| 6:00pm | 9:00am |
| 7:00pm | 10:00am |
| 8:00pm | 11:00am |
| 9:00pm | 12:00pm |
| 10:00pm | 1:00pm |
| 11:00pm | 2:00pm |
| 00:00 | 15:00 |
| 01:00 | 16:00 |
| 02:00 | 17:00 |
| 03:00 | 18:00 |
| 04:00 | 19:00 |
| 05:00 | 20:00 |
| 06:00 | 21:00 |
| 07:00 | 22:00 |
| 08:00 | 23:00 |
| 09:00 | 00:00 |
| 10:00 | 01:00 |
| 11:00 | 02:00 |
| 12:00 | 03:00 |
| 13:00 | 04:00 |
| 14:00 | 05:00 |
| 15:00 | 06:00 |
| 16:00 | 07:00 |
| 17:00 | 08:00 |
| 18:00 | 09:00 |
| 19:00 | 10:00 |
| 20:00 | 11:00 |
| 21:00 | 12:00 |
| 22:00 | 13:00 |
| 23:00 | 14:00 |
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; see upcoming clock changes worldwide.
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
Universal Time Coordinated
Offset: UTC is 0 hours ahead Greenwich Mean Time (GMT) and is used in Universal
Coordinated Universal Time (UTC) is the world time standard that regulates clocks and time. It is successor to Greenwich Mean Time (GMT). For casual use, UTC is the same as GMT, but is used by the scientific community.
UTC is the time standard commonly used across the world since 1972. It is used in many technical fields, like aviation industry and meteorologists, also used to synchronize time across internet networks.
UTC representations, usage and related time zones
- Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
- +00 - basic short
- +0000 - basic
- +00:00 - extended
- +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
- Zulu - Military abbreviation for UTC
- Z - short form of 'Zulu'
- Etc/UCT
- Etc/UTC
- Etc/Universal
- Etc/Zulu
- UCT
- UTC
- Universal
- Zulu
- EGST - Eastern Greenland Summer Time
- GMT - Greenwich Mean Time
- WET - Western European Time
- AZOST - Azores Summer Time
- UTC - Universal Time Coordinated
- WT - Western Sahara Standard Time
- Z - Zulu Time Zone