java中的日期比较大小

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方法一:

DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd"); 

String dateBegin=fmt.format(carrierCommand.getDateBegin()); 

String dateEnd=fmt.format(carrierCommand.getDateEnd()); 

//如果获得的日期格式不是'2008-05-22',就必须要格式化一下日期 

String dateBegin = request.getParameter("dateBegin"); 

String dateEnd = request.getParameter("dateEnd"); 

if(java.sql.Date.valueOf(dateBegin).after(java.sql.Date.valueOf(dateEnd))){ 

//起始日期大于结束日期 

errors.rejectValue("dateEnd", null, "起始日期必须小于结束日期!"); 

StringBuffer timeBegin = new StringBuffer(); 

StringBuffer timeEnd = new StringBuffer(); 

timeBegin.append(request.getParameter("timeBegin")); 

timeEnd.append(request.getParameter("timeEnd")); 

timeBegin.append(":00"); 

timeEnd.append(":00"); 

if(java.sql.Date.valueOf(dateBegin).equals(java.sql.Date.valueOf(dateEnd))) 

{ //起始日期等于结束日期 

if(java.sql.Time.valueOf(timeBegin.toString()).equals(java.sql.Time.valueOf 

(timeEnd.toString())))//时间相同 

errors.rejectValue("timeEnd", null, "起始与结束日期相同,起始时间必须小于结束时间!"); 

if(java.sql.Time.valueOf(timeBegin.toString()).after(java.sql.Time.valueOf 

(timeEnd.toString())))//时间相同 

errors.rejectValue("timeEnd", null, "起始与结束日期相同,起始时间必须小于结束时间!"); 

}

方法二:

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Date; 

/**

*

* @author hp

*/

public class test {

public static void main(String args[]) {

int i= compare_date("1995-11-12 15:21", "1999-12-11 09:59");

System.out.println("i=="+i);

}

public static int compare_date(String DATE1, String DATE2) {

DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm");

try {

Date dt1 = df.parse(DATE1);

Date dt2 = df.parse(DATE2);

if (dt1.getTime() > dt2.getTime()) {

System.out.println("dt1 在dt2前");

return 1;

} else if (dt1.getTime() < dt2.getTime()) {

System.out.println("dt1在dt2后");

return -1;

} else {

return 0;

}

} catch (Exception exception) {

exception.printStackTrace();

}

return 0;

}

}

方法三:

比如:现在是2004-03-26 13:31:40

过去是:2004-01-02 11:30:24

我现在要获得两个日期差,差的形式为:XX天XX小时XX分XX秒

java计算时间差及比较时间大小

比如:现在是2004-03-26 13:31:40

过去是:2004-01-02 11:30:24

我现在要获得两个日期差,差的形式为:XX天XX小时XX分XX秒

一:

DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

try

{

Date d1 = df.parse("2004-03-26 13:31:40");

Date d2 = df.parse("2004-01-02 11:30:24");

long diff = d1.getTime() - d2.getTime();

long days = diff / (1000 * 60 * 60 * 24);

}

catch (Exception e)

{

}

二:

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

java.util.Date now = df.parse("2004-03-26 13:31:40");

java.util.Date date=df.parse("2004-01-02 11:30:24");

long l=now.getTime()-date.getTime();

long day=l/(24*60*60*1000);

long hour=(l/(60*60*1000)-day*24);

long min=((l/(60*1000))-day*24*60-hour*60);

long s=(l/1000-day*24*60*60-hour*60*60-min*60);

System.out.println(""+day+"天"+hour+"小时"+min+"分"+s+"秒");

三:

SimpleDateFormat dfs = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

java.util.Date begin=dfs.parse("2004-01-02 11:30:24");

java.util.Date end = dfs.parse("2004-03-26 13:31:40");

long between=(end.getTime()-begin.getTime())/1000;//除以1000是为了转换成秒

long day1=between/(24*3600);

long hour1=between%(24*3600)/3600;

long minute1=between%3600/60;

long second1=between%60/60;

System.out.println(""+day1+"天"+hour1+"小时"+minute1+"分"+second1+"秒");

====================================================

java 比较时间大小

String s1="2008-01-25 09:12:09";

String s2="2008-01-29 09:12:11";

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

java.util.Calendar c1=java.util.Calendar.getInstance();

java.util.Calendar c2=java.util.Calendar.getInstance();

try

{

c1.setTime(df.parse(s1));

c2.setTime(df.parse(s2));

}catch(java.text.ParseException e){

System.err.println("格式不正确");

}

int result=c1.compareTo(c2);

if(result==0)

System.out.println("c1相等c2");

else if(result<0)

System.out.println("c1小于c2");

else

System.out.println("c1大于c2");

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