如何获取日期的剩余天数并打印小时、分钟和秒Java8开发者社区

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"endValidityDate": "2021-11-18T22:59:59Z"

DateTime.now().plusSeconds(172800)

val diff = endValidityDate.toDate().time - Date().time
val daysRemaining = TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS)
return if (daysRemaining > 1) "$daysRemaining days}"
       else TimeUnit.DAYS.convert(diff, TimeUnit.SECONDS).toString()

val expireDate = LocalDateTime.now()
                   .plusSeconds(uiState.endValidityDate.timeLeft.toLong())
                   .toEpochSecond(ZoneOffset.UTC)
val currentTime = LocalDateTime.now().toEpochSecond(ZoneOffset.UTC)

val duration = Duration.ofSeconds(it)
binding.myTextView.text = String.format(
    "%02dh: %02dm: %02ds",
    duration.seconds / 3600,
    (duration.seconds % 3600) / 60,
    duration.seconds % 60,
)

00h: 33m: 50s

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
}

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)
}

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)
}

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)
}

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

回答 1

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