使用 JAVA 中的数字获取日期和月份

Question

我想通过给定的数字获取日期和月份。我如何使用日历 class 轻松做到这一点？

示例：079 是 3 月 19 日。

Answer 1

试试这个：

      // Get the year, month, day, hour, minute, second   
      import java.util.Calendar;
      public class GetYMDHMS {
      public static void main(String[] args) {
      Calendar cal = Calendar.getInstance();
        // You cannot use Date class to extract individual Date fields
       int year = cal.get(Calendar.YEAR);
       int month = cal.get(Calendar.MONTH);      // 0 to 11
       int day = cal.get(Calendar.DAY_OF_MONTH);
       int hour = cal.get(Calendar.HOUR_OF_DAY);
       int minute = cal.get(Calendar.MINUTE);
       int second = cal.get(Calendar.SECOND);

      System.out.printf("Now is %4d/%02d/%02d %02d:%02d:%02d\n",  // Pad with zero
      year, month+1, day, hour, minute, second);
  }
  }

Answer 2

你需要这样的东西：

 Calendar localCalendar = Calendar.getInstance(TimeZone.getDefault());
 localCalendar.set(Calendar.DAY_OF_YEAR, 79);
 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
 String formatted = sdf.format(localCalendar.getTime());
 System.out.println(formatted);

这将输出“2015-03-20”。

使用 JAVA 中的数字获取日期和月份

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