is Distant Past
Returns true if the instant is Instant.DISTANT_PAST or earlier.
Samples
import kotlinx.datetime.*
import kotlinx.datetime.format.*
import kotlin.random.*
import kotlin.test.*
import kotlin.time.Duration.Companion.hours
fun main() {
//sampleStart
// Checking if an instant is so far in the past that it's probably irrelevant
val currentInstant = Clock.System.now()
val tenThousandYearsAgo = currentInstant.minus(1_000, DateTimeUnit.YEAR, TimeZone.UTC)
check(!tenThousandYearsAgo.isDistantPast)
check(Instant.DISTANT_PAST.isDistantPast)
//sampleEnd
}