Instant.kt

package kotlin.time

inline class Instant(val value: Duration) : Comparable<Instant> {

    companion object {
        val ZERO = Instant(Duration.ZERO)

        fun fromUnixTimeSeconds(time: Long): Instant =
            Instant(time.seconds)

        fun fromUnixTimeMilliSeconds(time: Long): Instant =
            Instant(time.milliseconds)
    }

    operator fun plus(duration: Duration): Instant =
        Instant(value + duration)

    operator fun minus(duration: Duration): Instant =
        Instant(value - duration)

    operator fun minus(duration: Instant): Duration =
        value - duration.value

    override operator fun compareTo(other: Instant): Int =
        value.compareTo(other.value)

    fun toUnixTimeSecondsLong(): Long =
        value.inSeconds.toLong()
}