// otherwise we'll use the current timestamp by default and miss
            val formatter = SimpleDateFormat("yyyyMMddHHmmssZ").apply {
                timeZone = TimeZone.getTimeZone("UTC")
            }
            return formatter.format(Date(0L))
        }

        val buildTimestampFromReceipt = buildTimestampFromBuildReceipt.orNull

import java.util.TimeZone


data class ReleasedVersion(val version: String, val buildTime: String) {
    fun gradleVersion() = GradleVersion.version(version)
    fun buildTimeStamp(): Date = SimpleDateFormat("yyyyMMddHHmmssZ").apply { timeZone = TimeZone.getTimeZone("UTC") }.parse(buildTime)

import spock.lang.Specification
import spock.lang.TempDir

import java.text.SimpleDateFormat

class UpdateReleasedVersionsIntegrationTest extends Specification {

    def format = new SimpleDateFormat('yyyyMMddHHmmssZ')

    @TempDir
    File tmpDir

    def setup() {
        format.timeZone = TimeZone.getTimeZone("UTC")
    }

    def "updated released version file has expected format"() {
        given:

@DisableCachingByDefault(because = "Not worth caching")
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 {

import spock.lang.Specification

import java.text.SimpleDateFormat

import static java.util.concurrent.TimeUnit.DAYS

class UpdateReleasedVersionsTest extends Specification {

    def format = new SimpleDateFormat('yyyyMMddHHmmssZ')

    def setup() {
        format.timeZone = TimeZone.getTimeZone("UTC")
    }

    def "final release is added to list"() {
        def snapshot = snapshot('4.3')

            Provider<String> buildTimestamp = moduleIdentity.getBuildTimestamp();
            DateTimeFormatter inputFormatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmssZ");
            DateTimeFormatter outputFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");