In Kotlin, you can use the built-in kotlin.time.Duration and kotlin.time.Instant classes to work with time intervals and timestamps.
To create a Duration instance, you can pass in a number and a TimeUnit value. For example, let's say you want to represent a duration of 2.5 seconds:
val duration = 2.5.seconds
You can also perform arithmetic operations with Duration instances, such as adding and subtracting them:
val duration1 = 2.5.seconds
val duration2 = 1.5.seconds
val totalDuration = duration1 + duration2 // 4.0 seconds
To create an Instant instance representing the current timestamp, you can use the kotlin.time.ExperimentalTime annotation and call the kotlin.time.Clock.System.now() function:
@ExperimentalTime
val currentTime = Instant.now()
You can also perform arithmetic operations with Instant instances, such as adding or subtracting a Duration:
val currentTime = Instant.now()
val futureTime = currentTime + 5.minutes
val pastTime = currentTime - 1.hour
You can then use these classes and operations to measure the duration of code execution, wait for a certain amount of time, or perform other time-related tasks in your Kotlin code.