Question 1

What is the time difference between JST and KST?

Accepted Answer

Korea Standard Time (KST) is 0 hours the same as Japan Standard Time (JST). Use the conversion table above to see the exact time for each hour.

Question 2

How do I convert JST to KST?

Accepted Answer

JST and KST share the same UTC offset, so no conversion is needed. 9:00 AM JST is 9:00 AM KST.

Question 3

What time is it in KST when it's noon in JST?

Accepted Answer

When it's 12:00 PM (noon) in JST, it's also 12:00 PM in KST since both timezones share the same UTC offset.

Question 4

How many hours apart is KST from JST?

Accepted Answer

JST and KST are in the same UTC offset, so there is no time difference between them.

Question 5

Is KST ahead or behind JST?

Accepted Answer

Neither — JST and KST share the same UTC offset and always show the same time.

Question 6

Does JST observe daylight saving time?

Accepted Answer

No, Japan Standard Time does not observe daylight saving time. The UTC offset remains the same year-round.

Question 7

Does KST observe daylight saving time?

Accepted Answer

No, Korea Standard Time does not observe daylight saving time. The UTC offset remains the same year-round.

Question 8

What is the best time to call from JST to KST?

Accepted Answer

The best time for a call between JST and KST is during overlapping business hours (9 AM – 5 PM) in both timezones. Check the color-coded conversion table above — green hours indicate business hours in both zones.

Japan Standard Time (JST)	Period	Korea Standard Time (KST)	Period
12:00 AM	Night	12:00 AM	Night
1:00 AM	Night	1:00 AM	Night
2:00 AM	Night	2:00 AM	Night
3:00 AM	Night	3:00 AM	Night
4:00 AM	Night	4:00 AM	Night
5:00 AM	Night	5:00 AM	Night
6:00 AM	Morning	6:00 AM	Morning
7:00 AM	Morning	7:00 AM	Morning
8:00 AM	Morning	8:00 AM	Morning
9:00 AM	Business	9:00 AM	Business
10:00 AM	Business	10:00 AM	Business
11:00 AM	Business	11:00 AM	Business
12:00 PM	Business	12:00 PM	Business
1:00 PM	Business	1:00 PM	Business
2:00 PM	Business	2:00 PM	Business
3:00 PM	Business	3:00 PM	Business
4:00 PM	Business	4:00 PM	Business
5:00 PM	Business	5:00 PM	Business
6:00 PM	Evening	6:00 PM	Evening
7:00 PM	Evening	7:00 PM	Evening
8:00 PM	Evening	8:00 PM	Evening
9:00 PM	Evening	9:00 PM	Evening
10:00 PM	Evening	10:00 PM	Evening
11:00 PM	Evening	11:00 PM	Evening

JST to KST Converter

Timezone Details

24-Hour Overview

JST to KST Conversion Table

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