'LocalDateTime in IntelliJ IDEA Kotlin shows as unresolved reference

java.time seems to be missing entirely. The code I'm trying it in is a simple

fun main(args: Array<String>) {
    println(LocalDateTime.now())
}

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.

intellij-idea kotlin

Solution 1:^[1]

The LocalDateTime class has only been introduced in Java SE 8, so you need to compile your project against JDK 8 or newer.

Make sure that:

You have an installed JDK 8 or newer;
Your project is compiled against this JDK 8+.

(In IntelliJ IDEA, Ctrl/?+Shift+Alt+S ? Project ? Project SDK; other build systems should be set up separately)

With the JDK configured correctly, the code should run fine as-is: (demo)

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Solution	Source
Solution 1