You can change your locale settings by means of the LC_ variables defined in
Code:
/etc/sysconfig/language
In particular look at RC_LC_TIME. All the locale definitions are under /usr/lib/locale. You can look at
man locale for some details or read instructions in the Suse Linux Reference Guide. You can also change setting via the /etc/sysconfig editor in Yast. Anyway, I don't know how to do things via webmin, sorry.