现在和将来的日期时间都可以使用 ZonedDateTime 来完成，然后计算一个 Duration.between ，而不是先计算剩余的秒，然后使用 Duration.ofSeconds() 。

下面是一个Kotlin的例子：

fun main() {
    val utc = ZoneId.of("UTC")
    val now = ZonedDateTime.now(utc)
    val twoDaysFromNow = now.plusDays(2)
    val remaining = Duration.between(now, twoDaysFromNow)
    println(
        String.format("%02dh: %02dm: %02ds",
                        remaining.seconds / 3600,
                        (remaining.seconds % 3600) / 60,
                        remaining.seconds % 60
}

输出： 48h: 00m: 00s

如果您只对剩下的一整天感兴趣，那么请考虑使用 ChronoUnit.DAYS.between ，可能如下所示：

fun main() {
    val utc = ZoneId.of("UTC")
    val now = ZonedDateTime.now(utc)
    val twoDaysFromNow = now.plusDays(2)
    val remainingDays = ChronoUnit.DAYS.between(now, twoDaysFromNow)
    println(
        String.format("%d days", remainingDays)
}

输出： 2 days

补充：

由于我不清楚您试图使用什么数据类型来计算到有效期结束前的时间，所以您必须在 中选择在问题 中提供更详细的信息，还是使用下列 fun 之一：

ZonedDateTime 传递

private fun getRemainingTime(endValidityDate: ZonedDateTime): String {
    // get the current moment in time as a ZonedDateTime in UTC
    val now = ZonedDateTime.now(ZoneId.of("UTC"))
    // calculate the difference directly
    val timeLeft = Duration.between(now, endValidityDate)
    // return the messages depending on hours left
    return if (timeLeft.toHours() >= 24) "${timeLeft.toDays()} days"
    else String.format("%02dh: %02dm: %02ds",
                        timeLeft.toHours(),
                        timeLeft.toMinutes() % 60,
                        timeLeft.toSeconds() % 60)
}

Instant 传递

private fun getRemainingTime(endValidityDate: Instant): String {
    // get the current moment in time, this time as an Instant directly
    val now = Instant.now()
    // calculate the difference
    val timeLeft = Duration.between(now, endValidityDate)
    // return the messages depending on hours left
    return if (timeLeft.toHours() >= 24) "${timeLeft.toDays()} days"
    else String.format("%02dh: %02dm: %02ds",
                        timeLeft.toHours(),
                        timeLeft.toMinutes() % 60,
                        timeLeft.toSeconds() % 60)
}

String 直接传递

private fun getRemainingTime(endValidityDate: String): String {
    // get the current moment in time as a ZonedDateTime in UTC
    val now = ZonedDateTime.now(ZoneId.of("UTC"))
    // parse the endValidtyDate String
    val then = ZonedDateTime.parse(endValidityDate)
    // calculate the difference
    val timeLeft = Duration.between(now, then)
    // return the messages depending on hours left