Hi, @Ronen1010 ,
If you wish to sort the files inside the Dropbox web, you may always make use of the list headers. There should be a "Modified" column header that you may click on. You may check out the official documentation here as a reference.
How to sort Dropbox files and fold
https://help.dropbox.com/installs-integrations/sync-uploads/sort-files
If you are referring to your Windows / Mac file system, then it really depends on the OS version.
Also, Dropbox got an advanced feature called "Automated folder" that could automatically house your files into subfolders based on month that may be helpful as well. For details, please check out another official documentation here.
Dropbox automation options
https://help.dropbox.com/files-folders/sort-preview/dropbox-automations
Happy Dropboxing
