title: How can I get last modified timestamp in Lua
body: <p>I am trying to work on Lua file handling.</p>
  
  <p>So, I am able to open, read, write, close the files.</p>
  
  <pre><code>local session_debug = io.open("/root/session_debug.txt", "a")
  session_debug:write("Some text\n")
  session_debug:close()
  </code></pre>
  
  <p>How can I know the last modified date timestamp of this file.</p>