I had a look and just saw user name and pws everywhere so gave up as its 1am and I'm up at 6am.
What exactly do you want?
For most Calander type things just use the date() function, I have a script that displays the date in the UK, and times in the UK and other areas, its about 10 lines. It can easily be modified to show the dates everywhere in the world.
It wouldn't be too tricky I wouldn't have thought to be able to enter a day (13\5\00)and have it calculate the day, Saturday as thats got to follow a patern.
If you want it to be a countdown thats easy enough again.
If your looking for it to be passworded thats again not too tough, but as I said, what do you want?