日期
package com.test.jedis;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class Test {
public static void main(String[] args) throws ParseException {
plusDay2(-1);
}
/**
* 指定日期加上天数后的日期
* @param num 为增加的天数
* @param newDate 创建时间
* @return
* @throws ParseException
*/
public static String plusDay(int num,String newDate) throws ParseException{
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date currdate = format.parse(newDate);
System.out.println("现在的日期是:" + currdate);
Calendar ca = Calendar.getInstance();
ca.add(Calendar.DATE, num);// num为增加的天数,可以改变的
currdate = ca.getTime();
String enddate = format.format(currdate);
System.out.println("增加天数以后的日期:" + enddate);
return enddate;
}
//当前日期加上天数:
/**
* 当前日期加上天数后的日期
* @param num 为增加的天数
* @return
*/
public static String plusDay2(int num){
Date d = new Date();
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String currdate = format.format(d);
System.out.println("现在的日期是:" + currdate);
Calendar ca = Calendar.getInstance();
//如果想设置为特定日期,用ca.setTime(Date date)
ca.add(Calendar.DATE, num);// num为增加的天数,可以改变的
d = ca.getTime();
String enddate = format.format(d);
System.out.println("增加天数以后的日期:" + enddate);
return enddate;
}
}
1.Calendar 转化 String
//获取当前时间的具体情况,如年,月,日,week,date,分,秒等
Calendar calendat = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String dateStr = sdf.format(calendar.getTime());
2.String 转化Calendar
String str="2010-5-27";
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
Date date =sdf.parse(str);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
3.Date 转化String
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
String dateStr=sdf.format(new Date());
4.String 转化Date
String str="2010-5-27";
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
Date birthday = sdf.parse(str);
5.Date 转化Calendar
Calendar calendar = Calendar.getInstance();
calendar.setTime(new java.util.Date());
6.Calendar转化Date
Calendar calendar = Calendar.getInstance();
java.util.Date date =calendar.getTime();