В Дельфи есть предопределенные переменные языковых установок и форматов:
SysUtils
The following are a set of variables used to define the format for numeric or date/time strings:
var CurrencyString: string;
var CurrencyFormat: Byte;
var NegCurrFormat: Byte;
var ThousandSeparator: Char;
var DecimalSeparator: Char;
var CurrencyDecimals: Byte;
var DateSeparator: Char;
var ShortDateFormat: string;
var LongDateFormat: string;
var TimeSeparator: Char;
var TimeAMString: string;
var TimePMString: string;
var ShortTimeFormat: string;
var LongTimeFormat: string;
var ShortMonthNames: array[1..12] of string;
var LongMonthNames: array[1..12] of string;
var ShortDayNames: array[1..7] of string;
var LongDayNames: array[1..7] of string;
var SysLocale: TSysLocale;
var EraNames: array[1..7] of string;
var EraYearOffsets: array[1..7] of Integer;
var TwoDigitYearCenturyWindow: Word = 50;
var TListSeparator: Char;

Автор: Vit (www.delphist.com, www.drkb.ru, www.unihighlighter.com, www.nevzorov.org)
Взято с Vingrad.ru http://forum.vingrad.ru