倒计时到一天结束

Question

public String getCountdown(UUID uuid, Quest quest) {

    String countdownTimePlaceholder = "";
    long questCompletedTimeMillis = plugin.getDatabaseManager().getQuestCompletedMillis(uuid, quest);
    long currentTimeMillis = System.currentTimeMillis();
    int hour = new Date().getHours();
    int minutes = new Date().getMinutes();
   

 int second = new Date().getSeconds();
        long seconds = ((24*60*60) - ((hour*60*60) + (minutes*60) + second));
        long seconds2 = seconds * 1000L;
        long waitingTime = currentTimeMillis - questCompletedTimeMillis;
        long waitingTimeDiv = waitingTime / 1000L;
        long waitingTimeSeconds = seconds - waitingTimeDiv, waitingTimeMinutes = waitingTimeSeconds / 60L, waitingTimeHours = waitingTimeMinutes / 60L;
        
        if (questCompletedTimeMillis + seconds2 > currentTimeMillis && questCompletedTimeMillis != 0L) {
            
            if (waitingTimeSeconds > 59L) waitingTimeSeconds -= 60L * waitingTimeMinutes;
            
            if (waitingTimeSeconds != 0L) countdownTimePlaceholder = waitingTimeSeconds + "s";
            
            if (waitingTimeMinutes > 59L) waitingTimeMinutes -= 60L * waitingTimeHours;
            
            if (waitingTimeMinutes > 0L) countdownTimePlaceholder = waitingTimeMinutes + "m " + countdownTimePlaceholder;
            
            if (waitingTimeHours > 0L) countdownTimePlaceholder = waitingTimeHours + "h " + countdownTimePlaceholder;
            
            return countdownTimePlaceholder;
        }
        return "-1";
    }

Answer 1

你说：

直到一天结束（23:59）

瞄准23:59是一个有缺陷的方法。首先，在某些时区的某些日期上，一天中的那个时间可能不存在。另一方面，你不能覆盖一整天，忽略了新一天开始前的整个一分钟。你不能把日子整齐地联系在一起，因为错过了一分钟的空隙。相反，通常最好的方法是半开放的，即开始是包容的，而结束是独占的。因此，一天一直到第二天的开始，但不包括第二天的开始。

ZoneId z = ZoneId.of( "Africa/Tunis" ) ;
ZonedDateTime now = ZonedDateTime.now( z ) ;

LocalDate tomorrow = now.toLocalDate().plusDays( 1 ) ;
ZonedDateTime tomorrowStart = tomorrow.atStartOfDay( z ) ;

Duration d = Duration.between( now.toInstant() , tomorrowStart.toInstant() ) ;