What is the time difference between Seoul and Shanghai?

Shanghai is 1 hour behind Seoul. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Shanghai from Seoul?

Between 10:00–18:00 in Seoul, which is 09:00–17:00 in Shanghai. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Seoul observe daylight saving time?

No. Seoul stays on UTC+9 all year, so its clocks never move.

Does Shanghai observe daylight saving time?

No. Shanghai stays on UTC+8 all year, so its clocks never move.

If it is midday in Seoul, what time is it in Shanghai?

It is 11:00 in Shanghai, on the same calendar date. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.

Which time zones do Seoul and Shanghai use?

Seoul uses Asia/Seoul, currently UTC+9, and Shanghai uses Asia/Shanghai, currently UTC+8. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Seoul time to Shanghai time

Right now Shanghai runs 1 hour behind Seoul. That gap is not fixed: it moves when either city changes its clocks.

Convert a time

From

Date

Time

Converted time

—

The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

The whole day mapped across: read down the left for Seoul, across for Shanghai.

Seoul	Shanghai
00:00	23:00previous day
01:00	00:00
02:00	01:00
03:00	02:00
04:00	03:00
05:00	04:00
06:00	05:00
07:00	06:00
08:00	07:00
09:00	08:00
10:00	09:00
11:00	10:00
12:00	11:00
13:00	12:00
14:00	13:00
15:00	14:00
16:00	15:00
17:00	16:00
18:00	17:00
19:00	18:00
20:00	19:00
21:00	20:00
22:00	21:00
23:00	22:00

Daylight saving time

Neither Seoul nor Shanghai changes its clocks, so the difference between them is the same every day of the year.

Seoul

Does not observe daylight saving time

Standard: UTC+9

Shanghai

Does not observe daylight saving time

Standard: UTC+8

When you can actually talk

You have 8 hours of shared working time: 10:00–18:00 in Seoul, which is 09:00–17:00 in Shanghai.

Seoul 10:00–18:00Shanghai 09:00–17:00

Reference

The zone identifiers and offsets behind everything above.

	Seoul	Shanghai
IANA zone	Asia/Seoul	Asia/Shanghai
Abbreviation	UTC+9	UTC+8
Standard offset	UTC+9	UTC+8
Daylight offset	—	—
Clock changes this year	0	0
Country	South Korea	China

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Seoul and Shanghai?: Shanghai is 1 hour behind Seoul. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Shanghai from Seoul?: Between 10:00–18:00 in Seoul, which is 09:00–17:00 in Shanghai. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Seoul observe daylight saving time?: No. Seoul stays on UTC+9 all year, so its clocks never move.
Does Shanghai observe daylight saving time?: No. Shanghai stays on UTC+8 all year, so its clocks never move.
If it is midday in Seoul, what time is it in Shanghai?: It is 11:00 in Shanghai, on the same calendar date. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.
Which time zones do Seoul and Shanghai use?: Seoul uses Asia/Seoul, currently UTC+9, and Shanghai uses Asia/Shanghai, currently UTC+8. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.