Time

Prior to Kotlin 2.1, developers typically relied on the kotlinx-datetime library to work with time. This library provided utilities like Instant.now() and Clock.now() to retrieve the current time.

However, starting with Kotlin 2.1, the standard library (kotlin.time) includes a new Clock interface with a system implementation (Clock.System). The goal is to consolidate Kotlin’s time APIs into a single, built-in solution, removing duplication between kotlinx-datetime and kotlin.time.

As part of that transition:

You now use Clock.System.now() from kotlin.time

Kotlin 2.1 introduced this new Clock interface with the following annotation:

@SinceKotlin("2.1")
@ExperimentalTime
public interface Clock

How to Get the Current Time

import kotlin.time.Clock
import kotlin.time.Instan

@OptIn(ExperimentalTime::class)
val now = Clock.System.now()

Make sure you’re importing the standard library types.

You do not need to include kotlinx-datetime unless you’re doing timezone conversions or working across JVM/JS/Native platforms.

Kotlin - Time