从特定日期获取日期、月份和年份

Question

我想获取特定日期的日期、月份和年份。

我使用了以下代码：

 String dob = "01/08/1990";

        int month = 0, dd = 0, yer = 0;

        try {

            SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
            Date d = sdf.parse(dob);
            Calendar cal = Calendar.getInstance();
            cal.setTime(d);
            month = cal.get(Calendar.MONTH);
            dd = cal.get(Calendar.DATE);
            yer = cal.get(Calendar.YEAR);

        } catch (Exception e) {
            e.printStackTrace();
        }

所以从上面的代码我得到 month -0 , yer - 1990 and date - 8

但是我想要month - 01 , date - 08 and yer - 1990.

我也定义了日期格式，但我没有从日期、月份和年份中获得完美的值。

Answer 1

在 java.util.Calendar 中，月份是从零开始的，因此它为您提供正确的值。

检查日历中的常量class:

public final static int JANUARY = 0;
public final static int FEBRUARY = 1;
...
public final static int DECEMBER = 11;

Answer 2

public static void main (String[] args) throws java.lang.Exception
{
     String dob = "01/08/1990";

    int month = 0, dd = 0, yer = 0;

    try {

        SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
        Date d = sdf.parse(dob);
        Calendar cal = Calendar.getInstance();
        cal.setTime(d);
        month = cal.get(Calendar.MONTH);
        dd = cal.get(Calendar.DATE);
        yer = cal.get(Calendar.YEAR);

        System.out.println("Month - " + String.format("%02d", (month+1)));
        System.out.println("Day - " + String.format("%02d", dd));
        System.out.println("Year - " + yer);

    } catch (Exception e) {
        e.printStackTrace();
    }
}

Since months in the Calendar are considered from 0-11 so we need to add 1 to it.

我已经执行了一个示例，您可以查看 here

Answer 3

日历中的月份将从 0 到 11。您必须在月份中添加 +1。

String dob = "01/08/1990";
String month = 0, dd = 0, yer = 0;
try {
     SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
     Date d = sdf.parse(dob);
     Calendar cal = Calendar.getInstance();
     cal.setTime(d);
     month = checkDigit(cal.get(Calendar.MONTH)+1);
     dd = checkDigit(cal.get(Calendar.DATE));
     yer = checkDigit(cal.get(Calendar.YEAR));

} catch (Exception e) {
     e.printStackTrace();
}

用于添加前导零的 checkDigit 方法。 checkDigit() 方法 returns 字符串值。如果你想转换成整数那么你可以像 Integer.parseInt(YOUR_STRING);

// ADDS 0  e.g - 02 instead of 2
    public String checkDigit (int number) {
        return number <= 9 ? "0" + number : String.valueOf(number);
    }

从特定日期获取日期、月份和年份

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