How do you use Mtime?

Modified timestamp (mtime) indicates the last time the contents of a file were modified. For example, if new contents were added, deleted, or replaced in a file, the modified timestamp is changed. To view the modified timestamp, we can simple use the ls command with -l option.

How does Linux Mtime work?

mtime changes when you write to the file. It is the age of the data in the file. Whenever mtime changes, so does ctime. But ctime changes a few extra times.