It's a regional topic.
For more informations look into unicodes database:
http://unicode.org/cldr
It a little bit off topic already :)
I'm interested in function like:
function getFirstDayOfTheWeek($country)
...
Of course, I can allow user to set this manually,
but I'm just looking for sane defaults.
As written before it's all available within Zend_Locale when you look at the
token "week".
And as mentioned in past the first day of week is NOT related to a language
but to a region. So "en" would not work but "US" would.
Greetings
Thomas Weidner, I18N Team Leader, Zend Framework
http://www.thomasweidner.com