Date.localeFormat("u") throws Sys.FormatException

Would you mind posting some code.

my code is very simple: datVar.localeFormat("u")

here is relevant code from MS Ajax framework. as you can see "u" is missing from that list

1Date._expandFormat = function Date$_expandFormat(dtf, format) {2if (!format) {3 format ="F";4 }5if (format.length === 1) {6switch (format) {7case"d":8return dtf.ShortDatePattern;9case"D":10return dtf.LongDatePattern;11case"t":12return dtf.ShortTimePattern;13case"T":14return dtf.LongTimePattern;15case"F":16return dtf.FullDateTimePattern;17case"M":case"m":18return dtf.MonthDayPattern;19case"s":20return dtf.SortableDateTimePattern;21case"Y":case"y":22return dtf.YearMonthPattern;23default:24throw Error.format(Sys.Res.formatInvalidString);25 }26 }27return format;28}