Delphi Basics : PDateTime command

DelphiBasics

PDateTime
Type

Pointer to a TDateTime value

System unit

type PDateTime = ^TDateTime;

Description

The PDateTime type is a pointer to a TDateTime value.

Pointer arithmetic, such as Inc, Dec can be used on it, for example to navigate a block of TDateTime values, as in the example.

Related commands

Dec		Decrement an ordinal variable
Inc		Increment an ordinal variable
TDateTime		Data type holding a date and time value

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Example code : Store 3 TDateTime values in memory and navigate through them

var
  dateTimePtr : PDateTime;
  a : TDateTime;

begin
  // Allocate storage for three date time variables
  GetMem(dateTimePtr, 3 * SizeOf(Extended));

  // Fill out these date time variables
  dateTimePtr^ := Yesterday;
  Inc(dateTimePtr);
  dateTimePtr^ := Date;
  Inc(dateTimePtr);
  dateTimePtr^ := Tomorrow;

  // Now display these values
  Dec(dateTimePtr, 2);
  ShowMessage('Yesterday = '+DateToStr(dateTimePtr^));
  Inc(dateTimePtr);
  ShowMessage('Today     = '+DateToStr(dateTimePtr^));
  Inc(dateTimePtr);
  ShowMessage('Tomorrow  = '+DateToStr(dateTimePtr^));
end;

Show full unit code

  Typical program output:

  Yesterday = 10/04/2003
  Today = 11/04/2003
  Tomorrow = 12/04/2003