How can I achieve this in Wordpress?

I'm still quite new to PHP, so pls bare with me. What I'd like to do in WP is instead of displaying the date and time in posts have it as numbers counting down from a specified number.

Example: First post on jan 1 09 would display as "number 100"
Second post written the next day would display as "number 99"
and so on...

Is this possible and if so how easy is it to implement?

thanks

 

I think you would use the 'for' function.

 

thanks, but what's the 'for' function?

 

so you want to number every post in the WP for every comment?

 

No, nothing to do with the comments. Instead of displaying date and time for the post, I'd like it to display "Number 100" (first post) then count down to "Number 1" each time I post. Essentially creating a Top 100 list.