Someone copied a folder contains many video files to my laptop . I'd like to know when he copied them and some other information like this . I think accessed date and modified date are not always right ! Please help me !
It depends on what information you want exactly, but it also depends on the file system and how the file system is mounted (noatime).
Probably the best command to start with is stat
Some references for you :
At the bottom of that page are a series of pages
The information is broken into several (7) short tutorials.
In a nut shell, by default, Ubuntu is going to trace when a file is accessed, modified, and changed but not when it was created. You can modify this behavior
From there the discussion become increasingly technical =)