Buffer Date Stamps

When a file is read into a buffer its (the file's) time of last modification is recorded, this can later be used to see if the file (on disk) has been modified since it was loaded into a buffer.

Variable: buffer-file-modtime

This buffer-local variable contains the file-modtime of the file stored in the buffer when it (the file) was last read from disk.

See section File Information.

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