As it was stated before in a previous Q and A you have to set not only your system locale to Japan but also your home location and system format to Japanese as well.
About moving the home location on your pc, most of you probably noticed that breaking the time zone make sometime ssl webpages unaccessible, because the utc of your pc is a day behind.
I would publish a workaround that i never saw anywhere except my own post elsewhere, to keep the timezone offset correct.
Before changing the timezone to Tokyo open regedit and navigate HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation .
Doubleclick on values ActiveTimeBias and Bias and copy out the data.
Change the timezone from the hour/date/timezone panel.
Get back to regedit and press F5 to refresh.
Doubleclick on values ActiveTimeBias and Bias and put the values back.
You probably need to fix ActiveTimeBias when change the time change between solar and legal, values must be increased/decreased in minutes but probably this is not important; it only breaks tools like freefilesync and similar.
Now both your local time and gmt/utc of your pc are correct and you don't have anymore problems with https, but remember that if you change the tiimezone again from the timezone panel, ActiveTimeBias and Bias are automatically overwritten with the official values.