Countdown timer

[Tonata]

Hi Everybody, I want to calculate when is my next rent due, and i want to calculate this every month. For example if i start paying my rent on the 15/05/2010, then i want the script to countdown until my next payment which is the 15th of the next month, and so on...

Could anybody please just give me an idea on how to do this...
Thank you for your help.

[bpat1434]

Search the boards. There are plenty of countdown scripts (or "age" scripts) which deal with calculating a time difference.