http://blog.csdn.net/liwenfeng1022/article/details/6534176
//字符串日期加1天
String sgrq = "20140101";
SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");
try {
Date d = formatter.parse(sgrq);
String qxrq = formatter.format(d.getTime() + (1 * 24 * 60 * 60 * 1000));
} catch (ParseException e) {
e.printStackTrace();
}
1.用java.util.Calender來實(shí)現(xiàn)
Calendar calendar=Calendar.getInstance();
calendar.setTime(new Date());
System.out.println(calendar.get(Calendar.DAY_OF_MONTH));//今天的日期
calendar.set(Calendar.DAY_OF_MONTH,calendar.get(Calendar.DAY_OF_MONTH)+1);//讓日期加1
System.out.println(calendar.get(Calendar.DATE));//加1之后的日期Top
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2.用java.text.SimpleDateFormat和java.util.Date來實(shí)現(xiàn)
Date d=new Date();
SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
System.out.println("今天的日期："+df.format(d));
System.out.println("兩天前的日期：" + df.format(new Date(d.getTime() - 2 * 24 * 60 * 60 * 1000)));
System.out.println("三天后的日期：" + df.format(new Date(d.getTime() + 3 * 24 * 60 * 60 * 1000)));
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GregorianCalendar gc=new GregorianCalendar();
gc.setTime(new Date);
gc.add(field,value);
value為正則往后,為負(fù)則往前
field取1加1年,取2加半年,取3加一季度,取4加一周
取5加一天....
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/*
*java中對日期的加減操作
*gc.add(1,-1)表示年份減一.
*gc.add(2,-1)表示月份減一.
*gc.add(3.-1)表示周減一.
*gc.add(5,-1)表示天減一.
*以此類推應(yīng)該可以精確的毫秒吧.沒有再試.大家可以試試.
*GregorianCalendar類的add(int field,int amount)方法表示年月日加減.
*field參數(shù)表示年,月.日等.
*amount參數(shù)表示要加減的數(shù)量.
*
* UseDate.java 測試如下:
*/
package temp.util;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.text.SimpleDateFormat;
public class UseDate {
Date d=new Date();
GregorianCalendar gc =new GregorianCalendar();
SimpleDateFormat sf =new SimpleDateFormat("yyyy-MM-dd");
public String getYears()
{
gc.setTime(d);
gc.add(1,+1);
gc.set(gc.get(Calendar.YEAR),gc.get(Calendar.MONTH),gc.get(Calendar.DATE));
return sf.format(gc.getTime());
}
public String getHalfYear()
{
gc.setTime(d);
gc.add(2,+6);
gc.set(gc.get(Calendar.YEAR),gc.get(Calendar.MONTH),gc.get(Calendar.DATE));
return sf.format(gc.getTime());
}
public String getQuarters()
{
gc.setTime(d);
gc.add(2,+3);
gc.set(gc.get(Calendar.YEAR),gc.get(Calendar.MONTH),gc.get(Calendar.DATE));
return sf.format(gc.getTime());
}
public String getLocalDate()
{
return sf.format(d);
}
public static void main(String[] args)
{
UseDate ud= new UseDate();
System.out.println(ud.getLocalDate());
System.out.println(ud.getYears());
System.out.println(ud.getHalfYear());
System.out.println(ud.getQuarters());
}
}
//當(dāng)月第一天和最后一天
SimpleDateFormat sf =new SimpleDateFormat("yyyyMMdd");
Calendar a=Calendar.getInstance();
int MaxDate=a.get(Calendar.DATE);
System.out.println("該月最大天數(shù):"+MaxDate+","+sf.format(a.getTime()));
a.set(Calendar.DATE, 1);//把日期設(shè)置為當(dāng)月第一天
System.out.println("當(dāng)月第一天:"+sf.format(a.getTime()));
a.roll(Calendar.DATE, -1);//日期回滾一天，也就是最后一天
System.out.println("當(dāng)月最后一天:"+sf.format(a.getTime()));
4 ,
GregorianCalendar gc=new GregorianCalendar();
try {
gc.setTime( new SimpleDateFormat("yyyyMM").parse("200901"));
gc.add(2, -Integer.parseInt("7"));
} catch (ParseException e) {
// TODO 自動生成された catch ブロック
e.printStackTrace();
}
System.out.println(new SimpleDateFormat("yyyyMM").format(gc.getTime()));
運(yùn)行結(jié)果：200806