Delphi Basics : LongDateFormat command

DelphiBasics

LongDateFormat
Variable

Long version of the date to string format

SysUtils unit

var LongDateFormat : string;

Description

The LongDateFormat variable provides the long (extended) formatting used for certain date to string conversions.

It is used by the DateTimeToString routine when the 'dddddd' formatting is used. The following formatting character strings can be used in the LongDateFormat string:

y	= Year last 2 digits
yy	= Year last 2 digits
yyyy	= Year as 4 digits
m	= Month number no-leading 0
mm	= Month number as 2 digits
mmm	= Month using ShortDayNames (Jan)
mmmm	= Month using LongDayNames (January)
d	= Day number no-leading 0
dd	= Day number as 2 digits
ddd	= Day using ShortDayNames (Sun)
dddd	= Day using LongDayNames (Sunday)

Notes

The default value is set from LOCALE_SLONGDATE

Related commands

DateTimeToStr		Converts TDateTime date and time values to a string
DateTimeToString		Rich formatting of a TDateTime variable into a string
DateToStr		Converts a TDateTime date value to a string
FormatDateTime		Rich formatting of a TDateTime variable into a string
ShortDateFormat		Compact version of the date to string format

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Example code : Illustrating customised LongDateFormat setting

var
  myDate : TDateTime;
  formattedDate : string;

begin
  myDate := StrToDate('29/02/2000');

  // Display using the default LongDateFormat
  DateTimeToString(formattedDate, 'dddddd', myDate);
  ShowMessage('29/02/2000 using  default = '+formattedDate);

  // Change the display formatting
  LongDateFormat := 'dddd dd of mmmm yyyy';
  DateTimeToString(formattedDate, 'dddddd', myDate);
  ShowMessage('29/02/2000 using override = '+formattedDate);
end;

Show full unit code

29/02/2000 using default = 29 February 2000
29/02/2000 using override = Tuesday 29 of February 2000