Delphi Basics : DecodeDate command

DelphiBasics

DecodeDate
Procedure

Extracts the year, month, day values from a TDateTime var.

SysUtils unit

procedure DecodeDate(const SourceDate TDateTime; out Year, Month, Day Word);

Description

The DecodeDate procedure extracts year, month and day values from a given SourceDate TDateTime type value.

It stores the values in the output variables : Year, Month and Day.

Related commands

DecodeDateTime		Breaks a TDateTime variable into its date/time parts
DecodeTime		Break a TDateTime value into individual time values
EncodeDate		Build a TDateTime value from year, month and day values
EncodeDateTime		Build a TDateTime value from day and time values
EncodeTime		Build a TDateTime value from hour, min, sec and msec values
RecodeDate		Change only the date part of a TDateTime variable
RecodeTime		Change only the time part of a TDateTime variable
ReplaceDate		Change only the date part of a TDateTime variable
ReplaceTime		Change only the time part of a TDateTime variable

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Example code : Add a month to a date and then extract the year, month and day values

var
  myDate : TDateTime;
  myYear, myMonth, myDay : Word;
begin
  // Set up the myDate variable to have a December 2000 value
  myDate := StrToDate('29/12/2000');

  // Now add a month to this value
  myDate := IncMonth(myDate);

  // And let us see what we get
  DecodeDate(myDate, myYear, myMonth, myDay);
  ShowMessage('myDate now = '+DateToStr(myDate));
  ShowMessage('myDay      = '+IntToStr(myDay));
  ShowMessage('myMonth    = '+IntToStr(myMonth));
  ShowMessage('myYear     = '+IntToStr(myYear));
end;

Show full unit code

  myDate now = 29/01/2001
  myDay = 29
  myMonth = 1
  myYear = 2001