Returns the time of a file in MarxMenu format. MarxMenu format is the
number of seconds since 01-01-80. This should not be confused with
FileDate which returns the file time on DOS binary format. Don't use
FileDate unless you're an expert.
Writeln 'File is ' Now - FileTime(FileName) ' seconds old.'
FileTime can also be used to set the date and time of a file.