[转载]Java中常用日期功能综合

JAVA日期（JAVA Date class）处理类，常用日期功能综合，JAVA日期工具
2009年04月10日 星期五 下午 12:07
package com.yao.util.date;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtil {

public static String defaultSimpleFormater = "yyyy-MM-dd hh:mm:ss";

/**
* 默认简单日期字符串
*
* @return
*/
public static String getDefaultSimpleFormater() {
return defaultSimpleFormater;
}

/**
* 设置默认简单日期格式字符串
*
* @param defaultFormatString
*/
public static void setDefaultSimpleFormater(String defaultFormatString) {
DateUtil.defaultSimpleFormater = defaultFormatString;
}

/**
* 格式化日期
*
* @param date
* @param formatString
* @return
*/
public static String format(Date date, String formatString) {
SimpleDateFormat df = new SimpleDateFormat(formatString);
return df.format(date);
}

/**
* 格式化日期(使用默认格式)
*
* @param date
* @return
*/
public static String format(Date date) {
return format(date, defaultSimpleFormater);
}

/**
* 转换成日期
*
* @param dateString
* @param formatString
* @return
*/
public static Date parse(String dateString, String formatString) {
SimpleDateFormat df = new SimpleDateFormat(formatString);
try {
return df.parse(dateString);
} catch (ParseException e) {
return null;
}
}

/**
* 转换成日期(使用默认格式)
*
* @param dateString
* @return
*/
public static Date parse(String dateString) {
return parse(dateString, defaultSimpleFormater);
}

/**
* 昨天
*
* @return
*/
public static Date yesterday() {
return addDay(-1);
}

/**
* 明天
*
* @return
*/
public static Date tomorrow() {
return addDay(1);
}

/**
* 现在
*
* @return
*/
public static Date now() {
return new Date(System.currentTimeMillis());
}

/**
* 按日加
*
* @param value
* @return
*/
public static Date addDay(int value) {
Calendar now = Calendar.getInstance();
now.add(Calendar.DAY_OF_YEAR, value);
return now.getTime();
}

/**
* 按日加,指定日期
*
* @param date
* @param value
* @return
*/
public static Date addDay(Date date, int value) {
Calendar now = Calendar.getInstance();
now.setTime(date);
now.add(Calendar.DAY_OF_YEAR, value);
return now.getTime();
}

/**
* 按月加
*
* @param value
* @return
*/
public static Date addMonth(int value) {
Calendar now = Calendar.getInstance();
now.add(Calendar.MONTH, value);
return now.getTime();
}

/**
* 按月加,指定日期
*
* @param date
* @param value
* @return
*/
public static Date addMonth(Date date, int value) {
Calendar now = Calendar.getInstance();
now.setTime(date);
now.add(Calendar.MONTH, value);
return now.getTime();
}

/**
* 按年加
*
* @param value
* @return
*/
public static Date addYear(int value) {
Calendar now = Calendar.getInstance();
now.add(Calendar.YEAR, value);
return now.getTime();
}

/**
* 按年加,指定日期
*
* @param date
* @param value
* @return
*/
public static Date addYear(Date date, int value) {
Calendar now = Calendar.getInstance();
now.setTime(date);
now.add(Calendar.YEAR, value);
return now.getTime();
}

/**
* 按小时加
*
* @param value
* @return
*/
public static Date addHour(int value) {
Calendar now = Calendar.getInstance();
now.add(Calendar.HOUR_OF_DAY, value);
return now.getTime();
}

/**
* 按小时加,指定日期
*
* @param date
* @param value
* @return
*/
public static Date addHour(Date date, int value) {
Calendar now = Calendar.getInstance();
now.setTime(date);
now.add(Calendar.HOUR_OF_DAY, value);
return now.getTime();
}

/**
* 按分钟加
*
* @param value
* @return
*/
public static Date addMinute(int value) {
Calendar now = Calendar.getInstance();
now.add(Calendar.MINUTE, value);
return now.getTime();
}

/**
* 按分钟加,指定日期
*
* @param date
* @param value
* @return
*/
public static Date addMinute(Date date, int value) {
Calendar now = Calendar.getInstance();
now.setTime(date);
now.add(Calendar.MINUTE, value);
return now.getTime();
}

/**
* 年份
*
* @return
*/
public static int year() {
Calendar now = Calendar.getInstance();
return now.get(Calendar.YEAR);
}

/**
* 月份
*
* @return
*/
public static int month() {
Calendar now = Calendar.getInstance();
return now.get(Calendar.MONTH);
}

/**
* 日(号)
*
* @return
*/
public static int day() {
Calendar now = Calendar.getInstance();
return now.get(Calendar.DAY_OF_MONTH);
}

/**
* 小时(点)
*
* @return
*/
public static int hour() {
Calendar now = Calendar.getInstance();
return now.get(Calendar.HOUR);
}

/**
* 分钟
*
* @return
*/
public static int minute() {
Calendar now = Calendar.getInstance();
return now.get(Calendar.MINUTE);
}

/**
* 秒
*
* @return
*/
public static int second() {
Calendar now = Calendar.getInstance();
return now.get(Calendar.SECOND);
}

/**
* 星期几(礼拜几)
*
* @return
*/
public static int weekday() {
Calendar now = Calendar.getInstance();
return now.get(Calendar.DAY_OF_WEEK) - 1;
}

/**
* 是上午吗?
*
* @return
*/
public static boolean isAm() {
Calendar now = Calendar.getInstance();
return now.get(Calendar.AM_PM) == 0;
}

/**
* 是下午吗?
*
* @return
*/
public static boolean isPm() {
Calendar now = Calendar.getInstance();
return now.get(Calendar.AM_PM) == 1;
}