title: LocalDateTime in IntelliJ IDEA Kotlin shows as unresolved reference
body: <p>java.time seems to be missing entirely. The code I'm trying it in is a simple </p>
  
  <pre><code>fun main(args: Array&lt;String&gt;) {
      println(LocalDateTime.now())
  }
  </code></pre>
  
  <p>Seems like I am missing something fundamental, but all I have been doing is following along in a tutorial and it just worked for the tutor.</p>