显示某一个文件的最后修改时间。
例如，我们可以不断地更新文件的最后修改时间。
For example, we could move the last-modified time for our file a minute further into the future.
解压缩文件解压缩较新的基础上最后修改时间。
函数的作用是：返回指定文件的最后修改时间。
The ftp_mdtm() function returns when the specified file was last modified.
times选项保持每个文件的访问权限、创建和最后修改时间。
The -times option preserves the access, creation, and last modified time of each file.
最后，在列出目录内容时，可以按照文件的最后修改时间进行排序，这样做有时很有帮助。
Finally, it's sometimes helpful when listing the contents of a directory to view the files sorted by their time of last modification.
例如，当写入一个文件的时候，这个文件的长度和最后修改时间都要在元数据缓存器里面更新。
For example, when we write to a file, the new length and the last modification timestamp are updated in the metadata cache.
这个网格文件系统不仅需要存储区块，还要存储元数据信息，像目录、文件名、文件大小、最后修改时间等。
The grid file system needs to not only store chunks, but also metadata information, such as directories, files, file sizes, last modification times and so on.
您可以选择性地为每个URL列出额外的信息，包括URL的最后修改时间、更改频率、终止日期和优先值。
Optionally, you can list additional information for each URL, including its last modification date, its change frequency, an expiration date, and a priority value.
如果以前面相同的方式再次检查基本属性，您会发现最后修改时间已被修改，但是创建时间和最后访问时间还保持原样。
If you check the basic attributes again, in the same way we did earlier, you should see that the last modified time has been altered but the creation time and last access time have remained the same.
元数据缓存器将目录和文件的路径名称保存为键，将元数据保存为值（如文件长度、最后修改时间、标记该条目是文件还是目录等）。
The metadata cache contains the full path names of directories and files as keys and metadata (e.g. file length, last modification date, and whether the key is a file or a directory) as values.
或者，如果关系记录中有最后一次修改的时间戳，可以使用LCLS x来将它与Notes文档的最后修改时间作比较。
Or, if there's a "last modified" timestamp in the relational record, use the LC LSX to compare it with the last modified time of the Notes document.
st_mtime——最后的修改时间。
st_mtime——最后的修改时间。
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