Count number of user logins for a Salesforce license in last 7 days and last 30 days

Hi,

i have to Count number of user logins for a Salesforce license in last 7 days and last 30 days in 2 seperate fields  and use it in a salesforce report.

Please note that, I don't need a reporting filter , i want a code, which counts the number of users who have logged in last 7/30 days and store it in 2 seperate fields