Nunmber of t-codes entered by User (developer)

Hi Experts,

I have requirement to get the t-codes information entered by user or developer in a perticular period of time.

Can I know the tables in which this kind of data gets stored.

I had a word with our basis consultant, he suggested me STAD t-code to get the details, its very limited & that too it gives only past 4 days data. I need to have the past one month data.

Pls suggest me

Regards

Sujatha