如何从当前日期获得准确的年龄（包括年份和月份）？

Question

我想找到准确的年龄，不仅以年为单位，还应该获得准确的月份。即当前date:18-05-2015，我要测试的日期是01-01-2010-输出应该是 4年8个月。

public float getAge (int _year, int _month, int _day) {

    GregorianCalendar cal = new GregorianCalendar();
    int y, m, d,a,b;
    //float ans = 0;         
    y = cal.get(Calendar.YEAR);
    m = cal.get(Calendar.MONTH);
    d = cal.get(Calendar.DAY_OF_MONTH);
    cal.set(_year, _month, _day);
    a = y - (cal.get(Calendar.YEAR));
   // b=m-(cal.get(Calendar.MONTH));
    if ((m < cal.get(Calendar.MONTH))
                    || ((m == cal.get(Calendar.MONTH)) && (d < cal
                                    .get(Calendar.DAY_OF_MONTH)))) {
            --a;
    }
    if(a < 0)
            throw new IllegalArgumentException("Age < 0");

    ans=a;
    return ans;
}

Answer 1

使用Joda时间。最好计算日期差异。Download joda-time.jar and将其粘贴到库中。

然后使用下面的代码：

public static String getTimestampDiff() {
        final DateTime start = new DateTime(datefrom.getTime());
        final DateTime end = new DateTime(dateto.getTime());
        Period p = new Period(start, end);
        PeriodFormatter formatter = new PeriodFormatterBuilder()
        .printZeroAlways().minimumPrintedDigits(2).appendYears()
        .appendSuffix(" year", " years").appendSeparator(", ")
        .appendMonths().appendSuffix(" month", " months").toFormatter();
        /* .appendSeparator(", ").appendDays()
                        .appendSuffix(" day", " days").appendSeparator(" and ")
                        .appendHours().appendLiteral(":").appendMinutes()
                        .appendLiteral(":").appendSeconds().toFormatter();*/
        return p.toString(formatter);
    }

您应该将 datefrom 和 dateto 声明为 Date class 的引用，例如：static Date datefrom,dateto; 并形成 datefrom 对象，例如：

private DatePickerDialog.OnDateSetListener pickerListener1 = new DatePickerDialog.OnDateSetListener() {

        // when dialog box is closed, below method will be called.
        @SuppressWarnings("deprecation")
        @Override
        public void onDateSet(DatePicker view, int selectedYear,
                int selectedMonth, int selectedDay) {

            datepickeryear  = selectedYear;
            datepickermonth = selectedMonth;
            datepickerday   = selectedDay;
            // Show selected date
            edfromdate.setText(new StringBuilder().append(datepickeryear)
                    .append("-").append(datepickermonth + 1)
                    .append("-").append(datepickerday).append(" "));

            datefrom =new Date(datepickeryear, datepickermonth+1, datepickerday);

        }
    };

这里我使用了日期选择器，但是你可以自己构造一个日期对象。

如何从当前日期获得准确的年龄（包括年份和月份）？

How to get accurate age(including year and months) from current date?

android

methods

datepicker

monthcalendar