Question 1

What is the time difference between KST and JST?

Accepted Answer

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

Question 2

How do I convert KST to JST?

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

How many hours apart is JST from KST?

Accepted Answer

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

Question 5

Is JST ahead or behind KST?

Accepted Answer

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

Question 6

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 7

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 8

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

Accepted Answer

The best time for a call between KST and JST 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.

Korea Standard Time (KST)	Period	Japan Standard Time (JST)	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

KST to JST Converter

Timezone Details

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KST to JST Conversion Table

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