my system is in a different language and I don't wanna change that and restart rn since I'm downloading stuff, so I'll just type out what the options probably are in english, this is on Windows 10 btw
go to Windows settings->time and language->click on date, time, and region on the right side of the screen->additional settings for date, time, and region on the right side->on the window that pops up click on "change the date, time, and number formats"->on the window that pops up after that, go to the first tab and select Japan on the first drop down menu
click "Apply" and happy fapping, no need to restart and you can just change it back if you want after you're done playing, if this doesn't work for you I'd try going to the additional settings option on this last window and changing "," to "." for the decimals or the other way around
let me know if it doesn't work or if my translation was shit and I'll change my system's language and get some screenshots when I wake up