DelphiBasics
DayOfTheMonth
Function
Gives day of month index for a TDateTime value (ISO 8601) DateUtils unit
 function DayOfTheMonth ( const Date : TDateTime ) : Word;
Description
The DayOfTheMonth function returns an index number for the day of the month.
 
Depending on the year and month, the value is in the range 1..31
Related commands
DayOfTheWeek Gives day of week index for a TDateTime value (ISO 8601)
DayOfTheYear Gives the day of the year for a TDateTime value (ISO 8601)
DayOfWeek Gives day of week index for a TDateTime value
MonthOfTheYear Gives the month of the year for a TDateTime value
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Example code : Show the day of the month for a TDateTime variable
// Full Unit code.
// -----------------------------------------------------------
// You must store this code in a unit called Unit1 with a form
// called Form1 that has an OnCreate event called FormCreate.
 
unit Unit1;
 
interface
 
uses
  DateUtils,   // Unit containing the DayOfTheMonth command
  SysUtils,
  Forms, Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  
Form1: TForm1;
 
implementation
{$R *.dfm} // Include form definitions
 
procedure TForm1.FormCreate(Sender: TObject);

var
  myDate : TDateTime;

begin
  myDate := EncodeDate(2002, 12, 31);
  ShowMessage('The day of the month = '+IntToStr(DayOfTheMonth(myDate)));
end;
 
end.
Hide full unit code
   The day of the month = 31
 
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