Unix Timestamp in Kotlin

Use `kotlinx-datetime` for multiplatform code, or `java.time` if you're JVM-only.

import kotlinx.datetime.Clock
val ts = Clock.System.now().epochSeconds
// 1706745600

import java.time.Instant
val ts = Instant.now().epochSecond
// 1706745600

import kotlinx.datetime.Instant
val instant = Instant.fromEpochSeconds(1706745600)

Clock.System.now().toString()
// '2024-01-31T22:40:00Z'