java判断时间是今天_Java 判断一个日期 是否为 今天、昨天

package com.example.test;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class CalendarTest {

/**

* @param args

*/

public static void main(String[] args) {

String time = formatDateTime("2013-08-13 15:41");

System.out.println("time:"+time);

time = formatDateTime("2013-08-12 15:45");

System.out.println("time:"+time);

time = formatDateTime("2013-08-11 15:43");

System.out.println("time:"+time);

}

/**

* 格式化时间

* @param time

* @return

*/

private static String formatDateTime(String time) {

SimpleDateFormat format = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm");

if(time==null ||"".equals(time)){

return "";

}

Date date = null;

try {

date = format.parse(time);

} catch (ParseException e) {

e.printStackTrace();

}

Calendar current = Calendar.getInstance();

Calendar today = Calendar.getInstance();//今天

today.set(Calendar.YEAR, current.get(Calendar.YEAR));

today.set(Calendar.MONTH, current.get(Calendar.MONTH));

today.set(Calendar.DAY_OF_MONTH,current.get(Calendar.DAY_OF_MONTH));

// Calendar.HOUR——12小时制的小时数 Calendar.HOUR_OF_DAY——24小时制的小时数

today.set( Calendar.HOUR_OF_DAY, 0);

today.set( Calendar.MINUTE, 0);

today.set(Calendar.SECOND, 0);

Calendar yesterday = Calendar.getInstance();//昨天

yesterday.set(Calendar.YEAR, current.get(Calendar.YEAR));

yesterday.set(Calendar.MONTH, current.get(Calendar.MONTH));

yesterday.set(Calendar.DAY_OF_MONTH,current.get(Calendar.DAY_OF_MONTH)-1);

yesterday.set( Calendar.HOUR_OF_DAY, 0);

yesterday.set( Calendar.MINUTE, 0);

yesterday.set(Calendar.SECOND, 0);

current.setTime(date);

if(current.after(today)){

return "今天 "+time.split(" ")[1];

}else if(current.before(today) && current.after(yesterday)){

return "昨天 "+time.split(" ")[1];

}else{

int index = time.indexOf("-")+1;

return time.substring(index, time.length());

}

}

}

运行结果测试

time:今天 15:41

time:昨天 15:45

time:08-11 15:43