I am looking to create a simple graph showing 2 numbers of time for my personal twitter. They are:

Number of followers per day
Number of mentions per day

From my research so far, the search API does not provide a date so I am not about to do a GROUP BY. The only way I can have access to dates is through the OAuth Api but that requires interaction from the end user which I am trying to avoid. 
Can someone point me in the right direction in order to achieve this? Thanks.
We can although use the search api to fetch mentions but there is a limit in it.
At a given point of time you can only fetch 200 mentions.
Any one knows how to get total mentions count?
Twitter API: Getting Data for Analytics