Seongnam keeps UTC+9 (KST) all year. There is no daylight saving time, so the clock never changes.
Seongnam and your time
Seongnam at a glance
| Country | South Korea |
|---|---|
| Region | Gyeonggi-do |
| Time zone | Asia/Seoul |
| Abbreviation now | KST |
| UTC offset now | UTC+9 |
| Daylight saving time | Not observed since 1988 |
| Coordinates | 37.44° N, 127.14° E |
Time zone in Seongnam
The clocks in Seongnam follow Asia/Seoul and do not move with the seasons. The last daylight saving period here was in 1988. Since then the offset has stayed at UTC+9.
Seongnam is on the same time as the rest of South Korea, including the capital, Seoul.
Clock changes in Seongnam, 2026 and 2027
No clock changes are scheduled in Seongnam for 2026 or 2027.
Time difference between Seongnam and other cities
When it is 9:00 AM in Seongnam, it is 7:00 PM (previous day) in New York, 11:00 AM in Sydney and 4:00 PM (previous day) in Los Angeles.
| City | Time now | Difference now | In January | In July | Shared office hours |
|---|---|---|---|---|---|
| New York (United States) | --:-- | 14 h behind | 14 h behind | 13 h behind | None |
| Los Angeles (United States) | --:-- | 17 h behind | 17 h behind | 16 h behind | None |
| London (United Kingdom) | --:-- | 9 h behind | 9 h behind | 8 h behind | None |
| Paris (France) | --:-- | 8 h behind | 8 h behind | 7 h behind | None |
| Dubai (United Arab Emirates) | --:-- | 5 h behind | 5 h behind | 5 h behind | 3 h |
| Mumbai (India) | --:-- | 3 h 30 min behind | 3 h 30 min behind | 3 h 30 min behind | 4 h 30 min |
| Singapore | --:-- | 1 h behind | 1 h behind | 1 h behind | 7 h |
| Tokyo (Japan) | --:-- | Same time | Same time | Same time | 8 h |
| Sydney (Australia) | --:-- | 2 h ahead | 2 h ahead | 1 h ahead | 6 h |
| UTC | --:-- | 9 h behind | 9 h behind | 9 h behind | None |
Seongnam never changes its clocks, but many of these cities do. Where the January and July columns disagree, the gap shifts when the other city moves to or from daylight saving time.
Shared office hours counts the time when the clock reads between 9 AM and 5 PM in both cities on the same day.
Daylight in Seongnam
Today
| Sunrise | --:-- |
|---|---|
| Sunset | --:-- |
| Day length | -- |
| Solar noon | --:-- |
Day length in Seongnam runs from 9 hours 35 minutes at the December solstice to 14 hours 45 minutes at the June solstice. The latest sunset, at 7:56 PM, comes on June 28.
Daylight through the year in Seongnam
| Date | Sunrise | Sunset | Day length | |
|---|---|---|---|---|
| March equinox | March 20 | 6:36 AM | 6:43 PM | 12 h 7 min |
| June solstice | June 21 | 5:11 AM | 7:56 PM | 14 h 45 min |
| September equinox | September 23 | 6:20 AM | 6:28 PM | 12 h 8 min |
| December solstice | December 22 | 7:42 AM | 5:17 PM | 9 h 35 min |
Clock time and sun time in Seongnam
Clock time and sun time line up fairly well in Seongnam: solar noon falls at about 12:30 PM on standard time.
Places close to Seongnam
All the places listed below keep the same time as Seongnam.
| City | Distance | Time now | Difference |
|---|---|---|---|
| Hanam | 13 km (8 mi) | --:-- | Same time |
| Anyang | 19 km (12 mi) | --:-- | Same time |
| Seoul | 20 km (12 mi) | --:-- | Same time |
| Suwon | 20 km (13 mi) | --:-- | Same time |
| Hwado | 28 km (17 mi) | --:-- | Same time |
| Ansan | 31 km (19 mi) | --:-- | Same time |
| Icheon | 32 km (20 mi) | --:-- | Same time |
| Osan | 32 km (20 mi) | --:-- | Same time |
More cities in South Korea
All time zones and cities in South Korea
Tools for time in Seongnam
- Convert a time to or from Seongnam: pick a date and time and see it in every city on your list.
- Add Seongnam to your world clock to keep it next to your own time.
- Find a meeting time that falls inside office hours in Seongnam and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What time zone is Seongnam in?
Seongnam uses the Asia/Seoul time zone, which is UTC+9 (KST) all year.
Does Seongnam use daylight saving time?
Not any more. Seongnam last changed its clocks for daylight saving time in 1988 and now stays on UTC+9 all year.
What is the time difference between Seongnam and New York?
Seongnam is 14 hours ahead of New York in January and 13 hours ahead of New York in July, because New York moves its clocks for daylight saving time and Seongnam does not.
Is Seongnam on the same time as Seoul?
Yes. Seongnam and Seoul both use UTC+9 right now.
How long is the longest day in Seongnam?
About 14 hours 45 minutes, around the June solstice. The shortest day, around the December solstice, has about 9 hours 35 minutes of daylight.
Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.