> 4.Time setting is incorrect. The installer seems to automatically > set the timezone to Tokyo/Japan, and using UTC setting. In result, > the time is set to 9 hours advance to JST.
That seems correct as long as we can assume you did choose Japanese as installation language, which at default priority, draws setting for Japan, including the timezone settings. I suspect that your computer's clock was previously NOT using UTC, which may explain the time difference after the installation of Debian.
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