关于日期的问题，请大家帮忙

Question

两个Date类型的日期，怎样用java写程序判断是否是同一年，同一个月呢？

Answer 1

Date d1 = new Date();
Date d2 = new Date();
System.out.println(d1.getYear() == d2.getYear() && d1.getMonth() == d2.getMonth());

Answer 2

Date.getter方法已经deprecated了
可以考虑用Calendar c = Calendar.getInstance();
c.setDate(Date date);
Calendar.get(Calendar.YEAR)

Answer 3

通过java提供的日期api方法分别对日期取年份，月份，日再进行比较就可以了

Answer 4

   /**
     * 判断二个时间是否在同一个周
     *
     * @param date1
     * @param date2
     * @return
     */
    public static boolean isSameWeekDates(Date date1, Date date2) {
        Calendar cal1 = Calendar.getInstance();
        Calendar cal2 = Calendar.getInstance();
        cal1.setTime(date1);
        cal2.setTime(date2);
        int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR);
        if (0 == subYear) {
            if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
                return true;
        } else if (1 == subYear && 11 == cal2.get(Calendar.MONTH)) {
            // 如果12月的最后一周横跨来年第一周的话则最后一周即算做来年的第一周
            if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
                return true;
        } else if (-1 == subYear && 11 == cal1.get(Calendar.MONTH)) {
            if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR))
                return true;
        }
        return false;
    }http://javaprogram.5d6d.com/thread-322-1-1.html

Answer 5

DateFormat   df   =   new   SimpleDateFormat( "yyyy-MM-dd",Locale.SIMPLIFIED_CHINESE); 
                                                  Date   d11   =   df.parse("2007-11-27"); 
                                                  Date   d22   =   df.parse("2007-11-27"); 
                                                  boolean   a   =   d11.before(d22); 

Answer 6

package test;import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;public class TestD
{
 public static boolean isSameYearMonth(Date date1, Date date2) { 
     Calendar cal1 = Calendar.getInstance(); 
     Calendar cal2 = Calendar.getInstance(); 
     cal1.setTime(date1); 
     cal2.setTime(date2); 
     int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR); 
     int subMonth=cal1.get(Calendar.MONTH)-cal2.get(Calendar.MONTH);
     
     if (0 == subYear&& 0==subMonth)
      return true;
     return false; 
   } 

public static void main(String[] args) throws ParseException
{
    TestD x=new TestD ();
    Date x1= new Date();
    Date x2= new Date();
    SimpleDateFormat d = new SimpleDateFormat("yyyy-MM-dd");
    x1=d.parse("2007-12-1");
    x2=d.parse("2007-12-31");
   if( x.isSameYearMonth(x1, x2))
   {
   System.out.println(x1.toString()+"和"+x2.toGMTString()+"同年同月");
   }
   else
   {
   System.out.println(x1.toLocaleString()+"和"+x2.toLocaleString()+"不同年同月");
   } }
}