title: How to detect the user's locale date and time format
body: <p>Is there a possibility to determine, with pure Javascript, what date time <strong>FORMAT</strong> has user configured on his operating system (Windows, Linux, MAC OS, etc.)?</p>
  
  <p>Thanks in advance.</p>
  
  <p>EDIT: I know about the method toLocaleString(), but this isn't help me to get the <strong>format</strong> that client has configured on his local machine.</p>