kotlin-stdlib/kotlin.time/Instant/epochSeconds

epochSeconds

val epochSeconds: Long(source)

The number of seconds from the epoch instant 1970-01-01T00:00:00Z rounded down to a Long number.

The difference between the rounded number of seconds and the actual number of seconds is returned by nanosecondsOfSecond property expressed in nanoseconds.

Note that this number doesn't include leap seconds added or removed since the epoch.

Since Kotlin

2.1

See also

Samples

import kotlin.test.*
import kotlin.time.*
import kotlin.time.Duration.Companion.hours
import kotlin.time.Duration.Companion.nanoseconds

fun main() { 
   //sampleStart 
   val currentInstant = Clock.System.now()
// The number of whole seconds that have passed since the Unix epoch.
println(currentInstant.epochSeconds)
// The number of nanoseconds that passed since the start of the second.
println(currentInstant.nanosecondsOfSecond) 
   //sampleEnd
}
import kotlin.test.*
import kotlin.time.*
import kotlin.time.Duration.Companion.hours
import kotlin.time.Duration.Companion.nanoseconds

fun main() { 
   //sampleStart 
   // When nanosecondAdjustment is within the range `0..999_999_999`,
// epochSeconds and nanosecondsOfSecond hold the exact values provided.
val instant1 = Instant.fromEpochSeconds(999_999, nanosecondAdjustment = 123_456_789)
println(instant1.epochSeconds) // 999999
println(instant1.nanosecondsOfSecond) // 123456789

// When nanosecondAdjustment exceeds `999_999_999`, the excess contributes to whole seconds,
// increasing epochSeconds. The remainder forms the new value of nanosecondsOfSecond.
val instant2 = Instant.fromEpochSeconds(1_000_000, nanosecondAdjustment = 100_123_456_789)
println(instant2.epochSeconds) // 1000100
println(instant2.nanosecondsOfSecond) // 123456789

// When nanosecondAdjustment is negative, epochSeconds is decreased
// to offset the negative nanoseconds and ensure nanosecondsOfSecond remains non-negative.
val instant3 = Instant.fromEpochSeconds(1_000_000, nanosecondAdjustment = -100_876_543_211)
println(instant3.epochSeconds) // 999899
println(instant3.nanosecondsOfSecond) // 123456789 
   //sampleEnd
}