Delphi's current year, this month, the first day of this week and the last day

Source: Internet
Author: User
Tags iso 8601

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;

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