Site.getDateSymbols ()
function returns the (already cached) DateFormatSymbols according to the locale defined for a site

Sourcecode in Site/objectFunctions.js:
1:   function getDateSymbols() {
2:      var symbols = this.cache.dateSymbols;
3:      if (symbols)
4:         return symbols;
5:      this.cache.dateSymbols = new java.text.DateFormatSymbols(this.getLocale());
6:      return this.cache.dateSymbols;
7:   }