[Overview][Constants][Procedures and functions][Index] Reference for unit 'dateutils' (#rtl)

# StartOfAWeek

Return a day of the week, given a year, week and day in the week.

## Declaration

Source position: line 0

 function StartOfAWeek( const AYear: Word; const AWeekOfYear: Word; const ADayOfWeek: Word ):TDateTime;function StartOfAWeek( const AYear: Word; const AWeekOfYear: Word ):TDateTime;

## Arguments

 AYear Year AWeekOfYear Week in the year ADayOfWeek Day in the week (default 1)

## Function result

First day of the given week, in TDateTime format.

## Arguments

 AYear Year AWeekOfYear Week in the year

## Description

StartOfAWeek returns a TDateTime value with the date of the indicated day of the week indicated by the AYear, AWeek, ADayOfWeek values.

The default value for ADayOfWeek is 1.

 StartOfTheWeek Return the first day of the week, given a date. EndOfTheWeek Calculate a DateTime value which represents the end of a week, given a date in that week. EndOfAWeek Return the last moment of day of the week, given a year and a week in the year. StartOfAMonth Return first date of month, given a year/month pair. EndOfTheYear Calculate a DateTime value representing the last day of a year, given a date in that year. EndOfAYear Calculate a DateTime value representing the last day of a year EndOfTheMonth Calculate a DateTime value representing the last day of the month, given a day in that month. EndOfAMonth Calculate a datetime value representing the last day of the indicated month

## Example

```Program Example34;

{ This program demonstrates the StartOfAWeek function }

Uses SysUtils,DateUtils;

Const
Fmt = '"First day of this week : "dd mmmm yyyy hh:nn:ss';
Fmt2 = '"Second day of this week : "dd mmmm yyyy hh:nn:ss';

Var
Y,W : Word;

Begin
Y:=YearOf(Today);
W:=WeekOf(Today);
Writeln(FormatDateTime(Fmt,StartOfAWeek(Y,W)));
Writeln(FormatDateTime(Fmt2,StartOfAWeek(Y,W,2)));
End.
```