'O-Kiraku Nikki' is Japanese for 'A Nice Calendar'.
It is a simple PHP program that allows you to display a calendar in a web site, with the possibility of adding as many annotations as you want to any day, and have these annotations displayed in your web page. You can use it as a diary, a weblog, an scheduler, etc.
It comes with full multilanguage (Unicode) support, and includes by default English, Japanese, Spanish, Italian, German, Dutch and Swedish translations. It has been designed with both security and simplicity in mind.