日付や計量単位のフォーマットを変更する
日付、時刻、数字、通貨、および計量単位のフォーマットを、あなたの地域の慣習に合わせて設定できます。
Open the Activities overview and start typing System.
Select Settings ▸ System from the results. This will open the System panel.
Select Region & Language to open the panel.
In the Your Account section, click Formats.
Under Common Formats, select the region and language that most closely matches the formats you would like to use.
Click Done to save.
Your session needs to be restarted for changes to take effect. Either click Restart…, or manually log back in later.
After you have selected a region, the area to the right of the list shows various examples of how dates and other values are shown. Although not shown in the examples, your region also controls the starting day of the week in calendars.
If there are multiple user accounts on your system, there is a separate section for the Login Screen in the Region & Language panel.