How can I search a file system and only return newer files?

Sorry the title didn't give me much room to work with. I'm writing a tool which needs to track all the files in an OS. What I'd like to do is make it so my program will only return files that have been modified/created since the last search to add to my program. I was wondering if there's an efficient way to do this other than checking each file's timestamps? Also is there a way to tell from a parent directory whether any files in its directory have been modified/created? I'm looking for ways for Windows and Linux.

I have no problem checking timestamps but it can be rather time consuming doing this. I don't know if this is quicker but I'd like to sort by modified date and check the time stamps for newer timestamps than the last time I ran. This way if I hit a time stamp equal to my last run I know to stop there. I checked Windows and the folder does tell you whether any file was created/modified in it's directory. However, if a file is created in one of its children's directories it won't update the time stamp. It's unfortunate because I could've avoided the search at a higher level directory otherwise. Without this I'll have to walk the whole structure one way or another. I can still improve the speed but I can't make it as efficient as I'd like.

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