View users who logged in during a specific time period using last

What I’m looking to do is get a sorted list of all users that have logged in during a specific time frame (say, for example, since the start of September).

How would I specify a time frame (like my example) within the last command?

I’m also thinking the command uniq would be a good way to eliminate any duplicate users who have logged in.
Also, the sort command seems to be a good way to sort the list, like I’m wanting to do.