计算两个日期之间的月份、分钟等[重复]

Question

m0skit0 在.Net 中。八行代码。用 Java 显示它。如果你认为你可以证明它。

Dim StartDate As Date = Now
Dim EndDate As Date = Now

EndDate = EndDate.AddSeconds(15)

Dim Months As Long = DateDiff(DateInterval.Month, StartDate, EndDate)
Dim Days As Long = DateDiff(DateInterval.Day, StartDate, EndDate)
Dim Hours As Long = DateDiff(DateInterval.Hour, StartDate, EndDate)
Dim Minutes As Long = DateDiff(DateInterval.Minute, StartDate, EndDate)
Dim Seconds As Long = DateDiff(DateInterval.Second, StartDate, EndDate)

下面的代码是错误的。以 Calendar cal2 = 开头的后半部分将在 TimerTask 中计算两次之间的差异并将其分解为月、日、小时、分钟和秒。

在顶部，我得到当前日期/时间，然后添加 15 秒。然后尝试计算差异。它似乎取决于我添加到第二个日期的时间。这几天我一直在为此苦苦挣扎。在某一时刻，除了工作时间是 4 小时之外，一切都匹配了，但我是 GMT+8，所以这没有任何意义。这就是我在时区（UTC）中添加的内容。我阅读了有关 Joda 时间的信息，但我对 Java 和 Android 仍然很陌生，并且在多次尝试安装这些库并回到纯 Java 之后。痛苦。

设计日期/时间的 Java 要么是疯子，要么是受虐狂，要么两者兼而有之。

（在 .Net 中这是 8 行代码。八行！）

Calendar cal = Calendar.getInstance();
TimeZone UTC = TimeZone.getTimeZone("UTC");
cal.setTimeZone(UTC);

int year = cal.get(Calendar.YEAR);
int month = cal.get(Calendar.MONTH);
int day = cal.get(Calendar.DAY_OF_MONTH);
int hour = cal.get(Calendar.HOUR);
int minutes = cal.get(Calendar.MINUTE);
int seconds = cal.get(Calendar.SECOND);

DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

try {
    endDate = dateFormat.parse(String.valueOf(year) + "-" + String.valueOf(month)
            + "-" + String.valueOf(day) + " " + String.valueOf(hour)
            + ":" + String.valueOf(minutes) + ":" + String.valueOf(seconds +15));
    dateFormat.setTimeZone(UTC);

} catch (ParseException ex) {
    Log.d("ParseException", ex.toString());
}

Calendar cal2 = Calendar.getInstance();
TimeZone UTC2 = TimeZone.getTimeZone("UTC");
cal.setTimeZone(UTC2);
Date beginDate = cal.getTime();

long millis = endDate.getTime() - beginDate.getTime();

if (TimeZone.getDefault().inDaylightTime( new Date())) {
    millis += 3600000;
}

String Months = (new SimpleDateFormat("M")).format(new Date(millis));
String Days = (new SimpleDateFormat("d")).format(new Date(millis));
String Hours = (new SimpleDateFormat("h")).format(new Date(millis));
String Minutes = (new SimpleDateFormat("m")).format(new Date(millis));
String Seconds = (new SimpleDateFormat("s")).format(new Date(millis));

Answer 1

这在没有任何额外导入的情况下有效，并且它占闰年！

import java.util.Calendar;

public class Interval {

    int currentYear, currentMonth, currentDay, currentHour, currentMinute, currentSecond,
        otherYear, otherMonth, otherDay, otherHour, otherMinute, otherSecond;

    public static void main(String[] args) {
        new Interval();
    }

    public Interval() {
        Calendar cal = Calendar.getInstance();

        //Set current date values
        currentYear = cal.get(Calendar.YEAR);
        currentMonth = cal.get(Calendar.MONTH);
        currentDay = cal.get(Calendar.DAY_OF_MONTH);
        currentHour = cal.get(Calendar.HOUR_OF_DAY); //Automatically in military time
        currentMinute = cal.get(Calendar.MINUTE);
        currentSecond = cal.get(Calendar.SECOND);

        //Set other date values for testing
        otherYear = 2015;//year is the same
        otherMonth = 5;//months start at 0 (0-11)
        otherDay = 1;//days start at 1
        otherHour = 19;//hours start at 0 (0-23, military time)
        otherMinute = 59;//minutes start at 0 (0-59)
        otherSecond = 0;//seconds start at 0 (0-59)

        int yearDifference = 0, monthDifference = 0, dayDifference = 0, hourDifference = 0,
                minuteDifference = 0, secondDifference = 0;

        //Calculate Differences
        yearDifference = otherYear - currentYear;
        monthDifference = otherMonth - currentMonth;
        dayDifference = otherDay - currentDay;
        hourDifference = otherHour - currentHour;
        minuteDifference = otherMinute - currentMinute;
        secondDifference = otherSecond - currentSecond;

        //Determine Days in given month
        int daysInCurrentMonth = 0;
        if(currentMonth == 1) {

            //Check for Leap Year
            if(currentYear % 4 == 0) {
                daysInCurrentMonth = 29;
            }
            else {
                daysInCurrentMonth = 28;
            }
        }
        else if(currentMonth == 0 || currentMonth == 2 || currentMonth == 4 || currentMonth == 6 ||
                currentMonth == 7 || currentMonth == 9 || currentMonth == 11) {
            daysInCurrentMonth = 31;
        }
        else {
            daysInCurrentMonth = 30;
        }

        //Deduct 1 from upper value if current is negative
        if(secondDifference < 0) {
            minuteDifference--;
            secondDifference += 60; 
        }
        if(minuteDifference < 0) {
            hourDifference--;
            minuteDifference += 60; 
        }
        if(hourDifference < 0) {
            dayDifference--;
            hourDifference += 24; 
        }
        if(dayDifference < 0) {
            monthDifference--;
            dayDifference += daysInCurrentMonth; 
        }
        if(monthDifference < 0) {
            yearDifference--;
            monthDifference += 12; 
        }

        System.out.println("Difference of " + yearDifference + " years, " + monthDifference + " months, " + dayDifference + " days, " +
            hourDifference + " hours, " + minuteDifference + " minutes, and " + secondDifference + " seconds.");
    }
}