There are aspects of the displayed data in Flow that are determined by the current culture setting. This applies to how numbers and dates are displayed.
To change the culture setting for a website in IIS (Internet Information Services Manager) you:
Select the website you want to configure
Double-click on the .NET Globalization
icon
Change the selections to the desired culture option from the lists for both
Culture
UI Culture
Click the Apply
link in the right hand actions pane
The default selection in IIS may look like this.