“Stuff I always forget how to do and have to google it”

Calculate elapsed in millis in kotlin:

val elapsed = measureTimeMillis {
    Thread.sleep(1000L)
}
assertThat(elapsed).isGreaterThan(1000L)

Calculate elapsed in seconds, nano seconds, milliseconds:

val elapsed = measureTime {
    Thread.sleep(1100L)
}
assertThat(elapsed.inSeconds).isGreaterThan(1.0)

println("micro=${elapsed.inMicroseconds}, nano=${elapsed.inNanoseconds}, milli=${elapsed.inMilliseconds}")

Obs: Needs @ExperimentalTime annotation

Source code: Here