Question

我想找出下一个3PM纽约时间和当前时间之间的毫秒差异。即如果现在是纽约时间下午5点。我应该在第二天下午5点到纽约时间下午3点之间得到区别。我怎么能用Java做呢？我很高兴使用JodaTime，请你做一个例子，如何做到这一点。

请帮忙。

Answer 1

以下是使用最流行的库选择的三种解决方案。它们都遵循相同的模式，只使用给定库的命名法。

Joda解决方案：

DateTime dt = new DateTime(DateTimeZone.forID("US/Eastern"));
DateTime target = dt
    .withHourOfDay(15)
    .withMinuteOfHour(0)
    .withSecondOfMinute(0)
    .withMillisOfSecond(0);

if (target.isBefore(dt)) {
  target = target.plusDays(1);
}

System.out.println(target.getMillis() - dt.getMillis());

Java 8解决方案

非常喜欢until()方法：

ZonedDateTime zdt = ZonedDateTime.now(ZoneId.of("US/Eastern"));
ZonedDateTime target2 = zdt
    .withHour(15)
    .withMinute(0)
    .withSecond(0)
    .withNano(0);

if (target2.isBefore(zdt)) {
  zdt = zdt.plusDays(1);
}

System.out.println(zdt.until(target2, ChronoUnit.MILLIS));

Java＆lt; = 7解决方案

Calendar c = Calendar.getInstance(TimeZone.getTimeZone("US/Eastern"));
Calendar target3 = Calendar.getInstance(TimeZone.getTimeZone("US/Eastern"));
target3.set(Calendar.HOUR_OF_DAY, 15);
target3.set(Calendar.MINUTE, 0);
target3.set(Calendar.SECOND, 0);
target3.set(Calendar.MILLISECOND, 0);

if (target3.before(c)) {
  target3.add(Calendar.DATE, 1);
}

System.out.println(target3.getTimeInMillis() - c.getTimeInMillis());

Answer 2

这个怎么样？

    Date now = new Date();
    Calendar ny3pmCalendar = new GregorianCalendar(TimeZone.getTimeZone("America/New_York"));
    ny3pmCalendar.setTime(now);
    if(ny3pmCalendar.get(Calendar.HOUR_OF_DAY) >= 15) {
        // next day
        ny3pmCalendar.add(Calendar.DAY_OF_YEAR, 1);
    }
    ny3pmCalendar.set(Calendar.HOUR, 15);
    ny3pmCalendar.set(Calendar.MINUTE, 0);
    ny3pmCalendar.set(Calendar.SECOND, 0);
    ny3pmCalendar.set(Calendar.MILLISECOND, 0);

    long diff = ny3pmCalendar.getTimeInMillis() - now.getTime();
    System.out.println(diff);

Answer 3

尝试joda DateTime和Period

    Date oldDate = new Date();
    DateTime old = new DateTime(oldDate);
    DateTime now = new DateTime();
    Period period = new Period(old, now, PeriodType.yearMonthDayTime());
    period.getYears();// give the difference in year
    period.getMonths();
    period.getDays();
    period.getMinutes();
    period.getSeconds();

Joda Time - 它具有许多日期时间操作功能

如何在java中找到当前时间和特定时间之间的差异

3 个答案:

Joda解决方案：

Java 8解决方案

Java＆lt; = 7解决方案