Hi,
found it (jsfunc.evalfield.js, line 442ff):
if (this.USmode)	{
	theString = 
(theTime.getUTCMonth()+1)+'-'+theTime.getUTCDate()+'-'+this.getYear(theTime);
} else {
	theString = 
theTime.getUTCDate()+'-'+(theTime.getUTCMonth()+1)+'-'+this.getYear(theTime);
}
so 2 hardcoded formats :(
vg Steffen