With my reader mounted on /media/KOBOeReader, in
"/media/KOBOeReader/.kobo/Kobo/Kobo eReader.conf" there is an entry:
[ApplicationPreferences]
CurrentLocale=en_US
I changed en_US to en_NZ, powered my Glo off then back on, and now it displays the date in proper NZ format DD/MM/YY instead MM/DD/YY.
See
post #120 for a list of English language locales available in firmware 2.4.0.