Utility programs:
Difference between two dates
- first decode and then delete the "dirty" characters (unknown char, signed like � ) inside the no_UTF8.txt file
- From Wikipedia: The replacement character � (often a black diamond with a white question mark) is a symbol found in the Unicode standard at codepoint U+FFFD in the Specials table. It is used to indicate problems when a system is unable to render a stream of data to a correct symbol.