Visual Studio Team Services is rather good, but if you are using it outside of the USA you’ll be fighting the date format, which displays in the month-day-year format. The recommended fix for this used to be to set your preferences to pick up the date format from the browser, but for some reason this no longer seems to work.
The current fix is as follows:
A) Go to your name in the top-right of the screen, then select “My Profile” -> “Preferences”
B) From the Language list, select an option that isn’t “Browser” (otherwise the date and time pattern are not editable).
C) Select the date pattern that you prefer
This will update the dates displayed in charts and on cards and reduce confusion.