Java 日期操作类 【Calendar】

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;

}

}