Measure elapsed time in Kotlin

This article explores different ways to measure the elapsed time of the program in Kotlin.

1. Using `System.nanoTime()` function

The recommended approach to measure the elapsed time of the program in Kotlin is with System.nanoTime(), which returns the current value of JVM’s time source with nanosecond precision.

fun main() {

val begin = System.nanoTime()

/* code starts */

// sleep for 2 seconds

Thread.sleep(2000)

/* code ends */

val end = System.nanoTime()

println("Elapsed time in nanoseconds: ${end-begin}")

}

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2. Using `System.currentTimeMillis()` function

You can also measure the elapsed time with System.currentTimeMillis(), but the results might not be that accurate.

fun main() {

val begin = System.currentTimeMillis()

/* code starts */

// sleep for 2 seconds

Thread.sleep(2000)

/* code ends */

val end = System.currentTimeMillis()

println("Elapsed time in milliseconds: ${end-begin}")

}

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Here’s alternative solution using Instant.now() which internally uses System.currentTimeMillis().

import java.time.Instant

fun main() {

val begin = Instant.now().toEpochMilli()

/* code starts */

// sleep for 2 seconds

Thread.sleep(2000)

/* code ends */

val end = Instant.now().toEpochMilli()

println("Elapsed time in milliseconds: ${end-begin}")

}

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3. Using `Date.getTime()` function

The Date class also offers the getTime() function that returns the milliseconds’ number since epoch. We can also use this to measure elapsed time in Kotlin, as shown below:

import java.util.Date

fun main() {

val begin = Date().time

/* code starts */

// sleep for 2 seconds

Thread.sleep(2000)

/* code ends */

val end = Date().time

println("Elapsed time in milliseconds: ${end-begin}")

}

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That’s all about measuring elapsed time in Kotlin.

Measure elapsed time in Kotlin

1. Using System.nanoTime() function

2. Using System.currentTimeMillis() function

3. Using Date.getTime() function

Share this:

1. Using `System.nanoTime()` function

2. Using `System.currentTimeMillis()` function

3. Using `Date.getTime()` function