Creator Report by Record Creation Date

Creator Report by Record Creation Date

I want to make what I think should be a very simple report in zoho creator.

The report would show us the number of leads we get per day.  

Should be easy but i can't see any way to add zoho record creation date to one of the report axis.

Why is this field not available to add to an axis?

This is a system field and i would rather not create a new field to hold the value as it is already stored.  

What am i doing wrong? 

I cant figure out how to use the  Add Aggregate Formula section either so if this is what i need to do i dont know how to write a forumla here.
It seems to just give me the following error message that I do not know how to correct:
  1. Sorry, cannot create a Aggregate Formula. You need to have an Aggregate function used in the formula.

    For other types of formula, use "Custom Formula" option.

The code im trying to use here is:
  1. currentdate( )