Delphi/Lazarus: Convert Year, Month and Day to DateTime-Format

That is possibly without any problems in Delphi as a well as in Lazarus. We are using the function EncodeDate for this. Here is a small example.

uses DateUtils;

var
  ADate: TDateTime;
  AYear, AMonth, ADay: integer;
begin

  ADay   := 1;
  AMonth := 1; 
  AYear  := 2000; 

  ADate  := EncodeDate(AYear, AMonth, ADay);

  ShowMessage(DateToStr(ADateTime));
end;

We have some variables for the year, the day and the month and we are using EncodeDate in order to make a date out of the values and to store the data in a TDateTime variable. After that, we are showing the new dates using ShowMessage().
2015-12-02 at 19:47