Date, time, and number formatting in MyCompanyDesk follows Dutch conventions and cannot be changed. There is no date or number format setting.

Number input fields, such as price and payment amount fields, accept both a comma and a period as the decimal separator, no matter which language your browser uses.

What you can change is the language of the app itself: go to Settings → "Weergave" (display) and pick Dutch, English, German, or French for the interface.