Modification Time (mtime)
A file's modification time describes when the content of the file most recently changed. Because most file systems do not compare data written to a file with what is already there, if a program overwrites part of a file with the same data as previously existed in that location, the modification time will be updated even though the contents did not technically change.
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“Now comes this Russian diversion. If it is more than just that it will mean the liberation of Europe from Nazi domination—and at the same time I do not think we need to worry about the possibility of any Russian domination.”
—Franklin D. Roosevelt (1882–1945)