title: How can I convert a Long value to date time and convert current time to Long kotlin?
body: <p>The Code A can convert a long value to date value, just like 2018.01.10</p>
  
  <ol>
  <li><p>I hope to get Date + Time value , such as 2018.01.10 23:11, how can I do with Kotlin? </p></li>
  <li><p>I hope to convert current time to a long value , how can I do with Kotlin? </p></li>
  </ol>
  
  <p>Thanks!</p>
  
  <p><strong>Code A</strong></p>
  
  <pre><code>fun Long.toDateString(dateFormat: Int =  DateFormat.MEDIUM): String {
      val df = DateFormat.getDateInstance(dateFormat, Locale.getDefault())
      return df.format(this)
  }
  </code></pre>