Modification dates are not propagated up the directory tree. Modification dates are only changed when something in the folder actually changes and not something in its sub-folders. In other words, it is possible to have a folder that has a newer modification date than its parent. For example, the modification date on my hard drive is 6/20/94 8:33 AM but the modification date for the system folder is 6/20/94 11:37 AM.
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