Well, this is somewhat of an unholy mess. I whipped up a quick date format comparator for glibc and icu for glibc’s supported locales and dispiritingly very few locales agree as to the short date format between icu, glibc, etc. To take one off the top, that of af_ZA
glibc: af_ZA.utf8: %x is 03/09/2009
icu 4.2: af_ZA: Short date is 2009-09-03
CLDR: af: date-short is 2009/09/03
OOo: Afrikaans (South Africa) 09/09/03
rats
Default icu rules seem (?) to get generated from CLDR and checked into icu, but these appear to be out of sync with the current CLDR version. e.g. some tools to get regenerate the icu data from CLDR. Need to have a look to see if that’s truly the case.









