Change bizare date format

[MatsSoderhall]

After installing Ubuntu 12.04 all date and time have a very bizare format. Months, years, days, hours, minutes are not only in random order, they also have a mix of numeric- and name- representations.... In short, the format is US...

How can i set the format to ISO 8601?

Note that i am not talking about the clock/calendar in the top of the screen. I want to change the system default.

[Peter Maunder]

Using 12.04 The CONTROL CENTRE (Systems Settings) has a LANGUAGE SUPPORT icon. This allows you to set the system wide language settings and also REGIONAL FORMATS. The DISPLAY NUMBERS DATES and CURRENCY Settings will give you what you want.

You can set the settings for just the logged on user or system wide.