Sao Paulo is 12 hours behind Seoul for most of the year: when it is 10:00 am in Seoul it is 10:00 pm (previous day) in Sao Paulo. In offset terms Seoul is on UTC+09:00 and Sao Paulo is on UTC-03:00 in January, and UTC+09:00 and UTC-03:00 in July. The converter above works from your browser’s own time zone data, so the figure it shows is the one in force today rather than the one that was in force when this page was written.
Neither city changes its clocks. Seoul stays on UTC+09:00 and Sao Paulo stays on UTC-03:00 all year. The difference is therefore fixed for all of 2026, which makes this one of the few city pairs where a single number is the whole answer: Sao Paulo is always 12 hours behind Seoul. Recurring meetings between the two never drift, and the table below confirms it period by period.
There is no overlap in office hours at all. Seoul works 09:00 to 18:00 and Sao Paulo works 09:00 to 18:00, and with 12 hours between them one city has closed before the other opens. Anything live has to be early for one side or late for the other; 18:00 to 19:00 in Seoul, which is 06:00 to 07:00 in Sao Paulo, is usually the least painful compromise. Both cities work Monday to Friday, so only the clock has to be reconciled.
Two local details worth knowing. Korea keeps UTC+09:00 year-round, the same clock as Japan, so the two are interchangeable for scheduling. Brazil dropped daylight saving in 2019, so the gap to Europe widens during the northern summer instead of holding steady.
The safest way to write a time for these two cities is to give both, as in "10:00 Seoul / 22:00 Sao Paulo", or to give the UTC offset. Abbreviations are the trap: Seoul is on KST for part of the year and KST for the rest, and the same three letters are reused in other parts of the world for entirely different offsets.
The formula
local Seoul- The time you enter, on the Seoul clock
offset- Each city’s UTC offset at that moment, read live from the IANA time zone database in your browser
−12- The difference in hours that holds for most of 2026: Sao Paulo is 12 hours behind Seoul
day shift- Whether the converted time falls on the previous, same or next calendar day in Sao Paulo
How it works, step by step
- Enter a time in Seoul using the 24-hour hour box and the minute box — 15:30 is hour 15, minute 30.
- Your browser reports the UTC offset in force in Seoul and in Sao Paulo for that moment, so a date near a daylight saving transition is handled correctly rather than with a fixed 12 hour rule.
- The second offset minus the first gives the difference, which is added to the time you entered. A result past midnight is marked as the next or previous day, because that is where most conversion mistakes live.
- The panel also shows the current time in both cities, the date in Sao Paulo, and whether the two offices are open at the same moment.
Worked examples
09:00 in Seoul
09:00 in Seoul is 21:00 in Sao Paulo (previous day) — after the Sao Paulo working day has finished. In 12-hour terms, 9:00 am against 9:00 pm (previous day). Only one of the two offices is open at that moment, so it is worth offering rather than assuming.
12:00 in Seoul
12:00 in Seoul is 00:00 in Sao Paulo — the middle of the night in Sao Paulo. In 12-hour terms, 12:00 pm against 12:00 am. Only one of the two offices is open at that moment, so it is worth offering rather than assuming.
17:00 in Seoul
17:00 in Seoul is 05:00 in Sao Paulo — the middle of the night in Sao Paulo. In 12-hour terms, 5:00 pm against 5:00 am. Only one of the two offices is open at that moment, so it is worth offering rather than assuming.
23:00 in Seoul, and the date problem
23:00 in Seoul is 11:00 in Sao Paulo on the same day. This is where conversions go wrong in writing: the time is right, the day is not, and a meeting invitation sent for "Tuesday" arrives for the wrong Tuesday. Give the date in both cities whenever the converted time is near midnight.
How to read your score
Frequently asked questions
How many hours behind Seoul is Sao Paulo?
Sao Paulo is 12 hours behind Seoul for most of 2026, so 09:00 in Seoul is 21:00 in Sao Paulo (previous day). That difference holds for the whole year, because the two clocks either never change or change on the same dates — the table on this page confirms it period by period.
What is 2 pm Seoul time in Sao Paulo?
2:00 am, the middle of the night in Sao Paulo. In 24-hour form 14:00 in Seoul is 02:00 in Sao Paulo, and that is outside working hours in Sao Paulo.
What is the best time to call between Seoul and Sao Paulo?
There is no time when both offices are open, so one side has to step outside its normal hours. The two least disruptive options are 08:00 in Seoul, which is 20:00 in Sao Paulo, or 18:00 in Seoul, which is 06:00 in Sao Paulo.
Is Sao Paulo ahead of or behind Seoul?
Sao Paulo is behind. Seoul is at UTC+09:00 and Sao Paulo is at UTC-03:00 in mid-January, and UTC+09:00 and UTC-03:00 in mid-July. The clock moves back going from Seoul to Sao Paulo, which is why Seoul reaches the end of its working day first.
Do Seoul and Sao Paulo change their clocks on the same date?
Neither city changes its clocks. In 2026, Seoul does not change its clocks at all, and Sao Paulo does not change its clocks at all. The difference between the two cities therefore holds all year.
What do the abbreviations for Seoul mean?
Seoul is on KST in winter and KST in summer, while Sao Paulo uses -03 and -03. Abbreviations are the least reliable way to write a time: several are ambiguous between regions, and the summer and winter forms are an hour apart. A UTC offset, or the time given in both cities, cannot be misread.
Does this converter stay correct after the clocks change?
Yes. It does not use a stored number for the difference. Each time you change a value it asks your browser for the UTC offset that Asia/Seoul and America/Sao_Paulo are on at that moment, using the IANA time zone database that ships with your operating system, and takes the difference. The tables on this page are computed from the same database for 2026.
Seoul to Sao Paulo: every hour, every period of 2026, and meeting slots
| Seoul (24h) | Seoul (12h) | Sao Paulo (24h) | Sao Paulo (12h) | Status |
|---|---|---|---|---|
| 00:00 | 12:00 am | 12:00 (previous day) | 12:00 pm (previous day) | office hours in Sao Paulo |
| 01:00 | 1:00 am | 13:00 (previous day) | 1:00 pm (previous day) | office hours in Sao Paulo |
| 02:00 | 2:00 am | 14:00 (previous day) | 2:00 pm (previous day) | office hours in Sao Paulo |
| 03:00 | 3:00 am | 15:00 (previous day) | 3:00 pm (previous day) | office hours in Sao Paulo |
| 04:00 | 4:00 am | 16:00 (previous day) | 4:00 pm (previous day) | office hours in Sao Paulo |
| 05:00 | 5:00 am | 17:00 (previous day) | 5:00 pm (previous day) | office hours in Sao Paulo |
| 06:00 | 6:00 am | 18:00 (previous day) | 6:00 pm (previous day) | outside office hours |
| 07:00 | 7:00 am | 19:00 (previous day) | 7:00 pm (previous day) | outside office hours |
| 08:00 | 8:00 am | 20:00 (previous day) | 8:00 pm (previous day) | outside office hours |
| 09:00 | 9:00 am | 21:00 (previous day) | 9:00 pm (previous day) | office hours in Seoul |
| 10:00 | 10:00 am | 22:00 (previous day) | 10:00 pm (previous day) | office hours in Seoul |
| 11:00 | 11:00 am | 23:00 (previous day) | 11:00 pm (previous day) | office hours in Seoul |
| 12:00 | 12:00 pm | 00:00 | 12:00 am | office hours in Seoul |
| 13:00 | 1:00 pm | 01:00 | 1:00 am | office hours in Seoul |
| 14:00 | 2:00 pm | 02:00 | 2:00 am | office hours in Seoul |
| 15:00 | 3:00 pm | 03:00 | 3:00 am | office hours in Seoul |
| 16:00 | 4:00 pm | 04:00 | 4:00 am | office hours in Seoul |
| 17:00 | 5:00 pm | 05:00 | 5:00 am | office hours in Seoul |
| 18:00 | 6:00 pm | 06:00 | 6:00 am | outside office hours |
| 19:00 | 7:00 pm | 07:00 | 7:00 am | outside office hours |
| 20:00 | 8:00 pm | 08:00 | 8:00 am | outside office hours |
| 21:00 | 9:00 pm | 09:00 | 9:00 am | office hours in Sao Paulo |
| 22:00 | 10:00 pm | 10:00 | 10:00 am | office hours in Sao Paulo |
| 23:00 | 11:00 pm | 11:00 | 11:00 am | office hours in Sao Paulo |
Computed at a difference of -12 hours, which is the one that holds for most of 2026. During the transition windows in the table below, shift the right-hand columns by an hour.
| Period | Length | Seoul offset | Sao Paulo offset | Difference | Abbreviations |
|---|---|---|---|---|---|
| 01 Jan to 31 Dec | 365 days | UTC+09:00 | UTC-03:00 | -12:00 | KST / -03 |
Every row is read from the IANA time zone database. Short periods appear where one city has changed its clocks and the other has not yet done so.
| Seoul | 12-hour | Sao Paulo | Verdict |
|---|---|---|---|
| 06:00 | 6:00 am | 18:00 (previous day) | Outside both |
| 06:30 | 6:30 am | 18:30 (previous day) | Outside both |
| 07:00 | 7:00 am | 19:00 (previous day) | Outside both |
| 07:30 | 7:30 am | 19:30 (previous day) | Outside both |
| 08:00 | 8:00 am | 20:00 (previous day) | Outside both |
| 08:30 | 8:30 am | 20:30 (previous day) | Outside both |
| 09:00 | 9:00 am | 21:00 (previous day) | After hours in Sao Paulo |
| 09:30 | 9:30 am | 21:30 (previous day) | After hours in Sao Paulo |
| 10:00 | 10:00 am | 22:00 (previous day) | After hours in Sao Paulo |
| 10:30 | 10:30 am | 22:30 (previous day) | After hours in Sao Paulo |
| 11:00 | 11:00 am | 23:00 (previous day) | After hours in Sao Paulo |
| 11:30 | 11:30 am | 23:30 (previous day) | After hours in Sao Paulo |
| 12:00 | 12:00 pm | 00:00 | Too early in Sao Paulo |
| 12:30 | 12:30 pm | 00:30 | Too early in Sao Paulo |
| 13:00 | 1:00 pm | 01:00 | Too early in Sao Paulo |
| 13:30 | 1:30 pm | 01:30 | Too early in Sao Paulo |
| 14:00 | 2:00 pm | 02:00 | Too early in Sao Paulo |
| 14:30 | 2:30 pm | 02:30 | Too early in Sao Paulo |
| 15:00 | 3:00 pm | 03:00 | Too early in Sao Paulo |
| 15:30 | 3:30 pm | 03:30 | Too early in Sao Paulo |
| 16:00 | 4:00 pm | 04:00 | Too early in Sao Paulo |
| 16:30 | 4:30 pm | 04:30 | Too early in Sao Paulo |
| 17:00 | 5:00 pm | 05:00 | Too early in Sao Paulo |
| 17:30 | 5:30 pm | 05:30 | Too early in Sao Paulo |
| 18:00 | 6:00 pm | 06:00 | Outside both |
| 18:30 | 6:30 pm | 06:30 | Outside both |
| 19:00 | 7:00 pm | 07:00 | Outside both |
| 19:30 | 7:30 pm | 07:30 | Outside both |
| 20:00 | 8:00 pm | 08:00 | Outside both |
| 20:30 | 8:30 pm | 08:30 | Outside both |
| 21:00 | 9:00 pm | 09:00 | After hours in Seoul |
| 21:30 | 9:30 pm | 09:30 | After hours in Seoul |
Office hours taken as 09:00–18:00 in Seoul and 09:00–18:00 in Sao Paulo, which are the customary hours in each city rather than a generic nine to five.