Sync Time between two devices

SyncTime.kt

import kotlin.*
import kotlin.jvm.*
import java.util.*
import java.lang.*
import java.time.*
import java.time.temporal.*

/**
 * We declare a package-level function main which returns Unit and takes
 * an Array of strings as a parameter. Note that semicolons are optional.
 */
fun main(args: Array<String>) {
    
    val zoneId = ZoneId.of("America/Chicago")
    var serverDate = ZonedDateTime.of(2017, 12, 8, 13, 30, 0, 0, zoneId)
    val nowDate = ZonedDateTime.now(zoneId)
    
    val timeOffset: Long = -7759 //fixed for test, almost 8 seconds - 7.759s
    //val timeOffset = ChronoUnit.MILLIS.between(nowDate, serverDate)
    
    val dateTimeProvider = OffsetDateTimeProvider(timeOffset) { nowDate }
    val providerNowDate = dateTimeProvider.now()
    
    println(nowDate)
    println(timeOffset)
    println(providerNowDate)
    
    println(ChronoUnit.SECONDS.between(nowDate, providerNowDate))
    println(ChronoUnit.SECONDS.between(nowDate, providerNowDate) * 1000 - ChronoUnit.MILLIS.between(nowDate, providerNowDate))
}

class OffsetDateTimeProvider(val milisecondsOffset: Long, val nowFn: () -> ZonedDateTime){
    fun now(): ZonedDateTime {
        
        val nowDateTime = this.nowFn()
        val result = nowDateTime.plus(milisecondsOffset, ChronoUnit.MILLIS)
        
        return result
    }
}

Device1 fire a "Start Stopwatch event";
Device[n] obtains the time, compares with its own (in milliseconds);
Device[n] will know the time difference to sync when getting DateTimes