Missing date class file?

[jambamkin]

I use an app called Androind Agenda Widget and when I try to use its customisation settings to make it say "Monday" it shortens it to "Mon" this only happens on MIUI; on sense or CM its the long version.

I contacted the developer and he says its to do with the DateFormat class file possibly missing from the ROM. http://developer.android.com/reference/android/text/format/DateFormat.html

Clearly I'm not clever enough to figure this out by myself. Seems to me it may be a translation thing, but I ain't posting in that forum for fear of flames.

That's the context

The questions are...

Has anyone had similar experiences with other date using apps?

Does anyone know who might know if this is a "bug" or "feature"?

 

[paulb_nl]

I'm guessing this is because of these strings <string name="day_of_week_long_monday">Mon</string> in framework-res.
This should be "Monday".
For some reason all of the long names are shortened in the language pack.