Java中设置日期格式代码

Java中设置日期格式代码

分类： JAVA基础2008-11-04
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javadatestring数据库

import java.util.*;

import java.text.SimpleDateFormat;

import java.sql.Date;

import java.sql.Time;

import java.sql.Timestamp;

public class TestDateTime

{

public static void main(String[] argv)

{

long nCurrentTime = System.currentTimeMillis();

java.util.Date utilDate = new java.util.Date(nCurrentTime);

//以下是用于数据库操作的日期和时间类

java.sql.Date sqlDate = new java.sql.Date(utilDate.getTime()); //java.util.Date和java.sql.Date的转换

java.sql.Time sqlTime = new java.sql.Time(utilDate.getTime());

java.sql.Timestamp sqlTimestamp = new java.sql.Timestamp(nCurrentTime);

//Calendar用于获取指定的时间项（字段）

Calendar calendar = Calendar.getInstance();

calendar.setTimeInMillis(nCurrentTime);

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

int month = calendar.get(Calendar.MONTH) + 1; //注意：返回的月份是基于0的！

int day = calendar.get(Calendar.DAY_OF_MONTH);

int hour = calendar.get(Calendar.HOUR_OF_DAY);

int minute = calendar.get(Calendar.MINUTE);

int second = calendar.get(Calendar.SECOND);

System.out.println("Current date is: " + year + "年" + month + "月" + day + "日");

System.out.println("Current time is: " + hour + "时" + minute + "分" + second + "秒");

//SimpleDateFormat用于格式化日期和时间

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

String szDatetime1 = df.format(utilDate);

System.out.println("Current datetime is: " + szDatetime1);

//以下计算两个日期值之间相差的时间

java.util.Date date2 = new java.util.Date(nCurrentTime - 24600 * 1000);

long nMilliSeconds = utilDate.getTime() - date2.getTime();

long nSeconds = nMilliSeconds / 1000; //把毫秒换算成秒

double nDays = nSeconds / (24d * 60d * 60d); //把秒换算成天

String szDatetime2 = df.format(date2);

System.out.println("Time between " + szDatetime1 + " and " + szDatetime2 + " is " + nSeconds + " seconds (" + nDays + " days)");

}

}

-----------------------------------

<%@ page contentType="text/html;charset=gb2312"%>

<%@ page import="java.text.*,java.util.*"%>

<%

// 字符串转化成时间类型（字符串可以是任意类型，只要和SimpleDateFormat中的格式一致即可）

java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("M/dd/yyyy hh:mm:ss a",java.util.Locale.US);

java.util.Date d = sdf.parse("5/13/2003 10:31:37 AM");

out.println(d);

out.println("<br>");

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

String mDateTime1=formatter.format(d);

out.println(mDateTime1);

out.println("<br>");

out.println(d.getTime());

out.println("<br>");

//当前时间

Calendar cal = Calendar.getInstance();

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

String mDateTime=formatter.format(cal.getTime());

out.println(mDateTime);

out.println("<br>");

//1年前日期

java.util.Date myDate=new java.util.Date();

long myTime=(myDate.getTime()/1000)-60*60*24*365;

myDate.setTime(myTime*1000);

String mDate=formatter.format(myDate);

out.println(mDate);

out.println("<br>");

//明天日期

myDate=new java.util.Date();

myTime=(myDate.getTime()/1000)+60*60*24;

myDate.setTime(myTime*1000);

mDate=formatter.format(myDate);

out.println(mDate);

out.println("<br>");

//两个时间之间的天数

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

java.util.Date date= myFormatter.parse("2003-05-1");

java.util.Date mydate= myFormatter.parse("1899-12-30");

long day=(date.getTime()-mydate.getTime())/(24*60*60*1000);

out.println(day);

out.println("<br>");

//加半小时

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

java.util.Date date1 = format.parse("2002-02-28 23:16:00");

long Time=(date1.getTime()/1000)+60*30;

date1.setTime(Time*1000);

String mydate1=formatter.format(date1);

out.println(mydate1);

out.println("<br>");

//年月周求日期

SimpleDateFormat formatter2 = new SimpleDateFormat("yyyy-MM F E");

java.util.Date date2= formatter2.parse("2003-05 5 星期五");

SimpleDateFormat formatter3 = new SimpleDateFormat("yyyy-MM-dd");

String mydate2=formatter3.format(date2);

out.println(mydate2);

out.println("<br>");

//求是星期几

mydate= myFormatter.parse("2001-1-1");

SimpleDateFormat formatter4 = new SimpleDateFormat("E");

String mydate3=formatter4.format(mydate);

out.println(mydate3);

out.println("<br>");

%>