If you are using FMC and have enabled the policy rules to "send connection events to FMC", then you can check the Analysis > Connection Events or Security Intelligence Events views.
Note that connection events often fill up the allocated space in the database and older events age out - often in less than a day depending on your environment.
Using an external log server can alleviate this - the link shared by @MHM Cisco World provides more detail on that. (But obviously it won't help you for anything that's past already.)
