uses DateUtils;
function StartOfTheYear(const AValue: TDateTime): TDateTime;
function EndOfTheYear(const AValue: TDateTime): TDateTime;
function StartOfAYear(const AYear: Word): TDateTime;
function EndOfAYear(const AYear: Word): TDateTime;
function StartOfTheMonth(const AValue: TDateTime): TDateTime;
function EndOfTheMonth(const AValue: TDateTime): TDateTime;
function StartOfAMonth(const AYear, AMonth: Word): TDateTime;
function EndOfAMonth(const AYear, AMonth: Word): TDateTime;
function StartOfTheWeek(const AValue: TDateTime): TDateTime; {ISO 8601}
function EndOfTheWeek(const AValue: TDateTime): TDateTime; {ISO 8601}
function StartOfAWeek(const AYear, AWeekOfYear: Word; {ISO 8601}
const ADayOfWeek: Word = 1): TDateTime;
function EndOfAWeek(const AYear, AWeekOfYear: Word; {ISO 8601}
const ADayOfWeek: Word = 7): TDateTime;