Java代码

public class test1 {

public static void main(String[] args) {

Calendar c = Calendar.getInstance();

int year=c.get(Calendar.YEAR);

int month=c.get(Calendar.MONTH)+1;

int date=c.get(Calendar.DATE);

System.out.println("今天是"+year+"年"+month+"月"+date+"日");

System.out.println("是今年的第"+c.get(Calendar.DAY_OF_YEAR)+"天");

System.out.println("c.getTime()的结果: "+c.getTime());

System.out.println("new Date()的结果: "+new Date());

c.set(Calendar.DAY_OF_YEAR, date + 30);

System.out.println("17天后是"+c.getTime());

}

}

Java代码

public static Date getDateBefore(Date d, int day) {

Calendar now = Calendar.getInstance();

now.setTime(d);

now.set(Calendar.DATE, now.get(Calendar.DATE) - day);

return now.getTime();

}

public static Date getDateAfter(Date d, int day) {

Calendar now = Calendar.getInstance();

now.setTime(d);

now.set(Calendar.DATE, now.get(Calendar.DATE) + day);

return now.getTime();

}

注意int month=c.get(Calendar.MONTH)+1哦，好像系统是从0开始计月份，到了12月就归零了。所以单独取月份时，要在后面加一才能得到当前的月份。

calender日期加减后赋值给Date类型

Java代码

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

String time=sdf.format(new Date());

Calendar cd = Calendar.getInstance();

try {

cd.setTime(sdf.parse(time));

} catch (ParseException e) {

e.printStackTrace();

}

cd.add(Calendar.DATE, 1);//增加一天

//cal.add(Calendar.DATE, -1); //减一天

//cd.add(Calendar.MONTH, 1);//增加一月

Date date=cd.getTime();

System.out.println(sdf.format(date));

将yyyy//MM/dd的字符串类型转为Date类型

Java代码

SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd");

str12 = format.parse(str12_1);

在excel导入数据时，日期类型的数据直接获取

Java代码

CellType t1 = st.getCell(11, row).getType();

Date regDate = null;

Date str12=null;//出生年月,不能为空

if (t1 == CellType.DATE)

{

DateCell regCell = (DateCell) st.getCell(11, row);

str12 = regCell.getDate();

}

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