function DateTimeToFileDate ( DateTime : TDateTime ) : Integer;
Description
The DateTimeToFileDate function converts a TDateTime value DateTime to the format used for file dates.
The file date is more restricted in range than TDateTime : Year must be 1980 .. 2099 Milli-seconds are rounded to 2 decimal places
Related commands
FileAge Get the last modified date/time of a file without opening it
FileDateToDateTime Converts a file date/time format to a TDateTime value
FileSetDate Set the last modified date and time of a file
Example code : Display, update, and redisplay the last modified date of a file
var
fileName : string;
fileDate : Integer;
newDateTime : TDateTime;
begin
// Try to open the Unit1.DCU file for the current project
fileName := 'Unit1.DCU';
fileDate := FileAge(fileName);
// Did we get the file age OK?
if fileDate > -1 then
begin
ShowMessage(fileName+' last modified date = '+
DateTimeToStr(FileDateToDateTime(fileDate)));
// Now change the last modified date
newDateTime := StrToDateTime('01/01/2000 12:34:56');
FileSetDate(fileName, DateTimeToFileDate(newDateTime));
end;
// Did we update the file last modified date OK?
fileDate := FileAge(fileName);
if fileDate > -1 then
ShowMessage(fileName+' last modified date = '+
DateTimeToStr(FileDateToDateTime(fileDate)));
end;
Show full unit code
Unit1.DCU last modified date = 30/10/2002 15:16:22
Unit1.DCU last modified date = 01/01/2000 12:34:56