runningOnCi.get() -> "from current time because CI"
                else -> "from current date"
            }
        }

    private
    fun Date.withoutTime(): Date = SimpleDateFormat("yyyy-MM-dd").run {
        parse(format(this@withoutTime))
    }

    override fun log(event: ResolverEvent) {
        eventLoop.accept(now() to event)
    }

    private
    val eventLoop = EventLoop<Pair<Date, ResolverEvent>> { poll ->

        val format = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ")

        bufferedAppendWriter().use { writer ->

            fun write(timestamp: Date, e: ResolverEvent) {
                try {

abstract class BuildReceipt : DefaultTask() {
    companion object {
        private
        val timestampFormat = newSimpleDateFormatUTC("yyyyMMddHHmmssZ")

        private
        val isoTimestampFormat = newSimpleDateFormatUTC("yyyy-MM-dd HH:mm:ss z")

        private
        fun newSimpleDateFormatUTC(pattern: String) = SimpleDateFormat(pattern).apply {
            timeZone = TimeZone.getTimeZone("UTC")
        }