Question

public long compareTwoTimeStamps(Timestamp currentTime, Timestamp oldTime) 
{
  long milliseconds1 = oldTime.getTime();
  long milliseconds2 = currentTime.getTime();
  long diff = milliseconds2 - milliseconds1;
  long diffMinutes = diff / (60 * 1000);
  return diffMinutes;
}

上述代码也考虑了日期。我需要比较时间戳的2个实例，并仅比较时间戳的时间部分。不应考虑日期。每当我比较它时，比较也会考虑日期。

Answer 1

一个解决方案，在时间戳上使用getHours，getMinutes：

public long compareTwoTimeStamps(java.sql.Timestamp currentTime, java.sql.Timestamp oldTime) 
{
    long min1 = oldTime.getHours() * 60 + oldTime.getMinutes();
    long min2 = currentTime.getHours() * 60 + currentTime.getMinutes();
    return min2 - min1;
}

或没有任何弃用的方法：

public long compareTwoTimeStamps(java.sql.Timestamp currentTime, java.sql.Timestamp oldTime)
{
    final Calendar oldCal = Calendar.getInstance();
    oldCal.setTime(oldTime);
    long min1 = oldCal.get(Calendar.HOUR) * 60 + oldCal.get(Calendar.MINUTE);
    final Calendar currentCal = Calendar.getInstance();
    oldCal.setTime(currentTime);
    long min2 = currentCal.get(Calendar.HOUR) * 60 + currentCal.get(Calendar.MINUTE);
    return min2 - min1;
}

Answer 2

我认为最安全的方法是使用Calendars：

public static boolean sameTime(Date a, Date b) {
    Calendar ca = Calendar.getInstance();
    ca.setTime(a);
    Calendar cb = Calendar.getInstance();
    cb.setTime(b);
    return ca.get(Calendar.HOUR_OF_DAY) == cb.get(Calendar.HOUR_OF_DAY)
            && ca.get(Calendar.MINUTE) == cb.get(Calendar.MINUTE)
            && ca.get(Calendar.SECOND) == cb.get(Calendar.SECOND)
            && ca.get(Calendar.MILLISECOND) == cb.get(Calendar.MILLISECOND);
}

这将考虑夏令时。

更新：

哦，它没有使用任何弃用的方法。

Answer 3

另一种方法是使用JODA Time的LocalTime：

public static boolean sameTime(Date a, Date b) {
    return new LocalTime(a).compareTo(new LocalTime(b)) == 0;
    // equals() or isEquals() may also work depending on your case, you may try
}

Answer 4

您可以通过使用modulo截断日期来仅比较表示时间的getTime（）的毫秒数：

private static long MILLIS_PER_DAY = 1000 * 60 * 60 * 24l;
private static long MILLIS_PER_MINUTE = 1000 * 60l;
public long compareTwoTimeStamps(Timestamp currentTime, Timestamp oldTime) 
{

  long milliseconds1 = oldTime.getTime() % MILLIS_PER_DAY;
  long milliseconds2 = currentTime.getTime() % MILLIS_PER_DAY;
  return milliseconds2 - milliseconds1;
  // for minutes:
  // return (milliseconds2 - milliseconds1) / MILLIS_PER_MINUTE;
}

如何比较java.sql.TimeStamp中的时间

4 个答案: