Parser has several build-in conversion routines:

CHR returns the character by code.

function Chr(X: Integer): Char;

For example, CHR(65)='A'

ORD returns the code of character.

function Ord(X: Char): Integer;

For example, ORD('A')=65

IntToStr converts an integer to a string.

function IntToStr(Value: Integer): string;

StrToInt converts a string representing an integer (decimal or hex
notation) to a number.

function StrToInt(Value: string): Integer;

FloatToStr converts a floating point value to a string.

function FloatToStr(Value: Number): string;

StrToFloat converts given string to a floating-point value.

function StrToFloat(S: string): Number;

DateToStr converts a variable of type TDateTime to a formatted string

function DateToStr(Date: TDateTime): string;

StrToDate converts a string to a date format.

function StrToDate(S: string): TDateTime;