Is the time used in Korea and Japan the same and different?

pu1. Korea and Japan have the same standard time

2017-12-27

OK

pu2. It's a different story, but it's not standard time, it's standard time

2017-12-27

OK

pu3. If you look at the actual position of the sun, it's right that there's a 30 minute difference. But for convenience, we're using the same perspective

2017-12-27

OK