java实用工具（时间日期）

时间工具：


package com.omg.web.util;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class DateUtil {

private static final Log LOG = LogFactory.getLog(DateUtil.class);

private static final SimpleDateFormat DF_YMD = new SimpleDateFormat(
"yyyyMMdd");

private static final SimpleDateFormat DF_YMDHMS2 = new SimpleDateFormat(
"yyyyMMddHHmmss");

private static final SimpleDateFormat DF_YMD2 = new SimpleDateFormat(
"yyyy-MM-dd");

private static final SimpleDateFormat DF_YMDHMS = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
// 11/23/2012 2:34:11 PM
private static final SimpleDateFormat DF_MDYHMS = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a", Locale.US);


private static final SimpleDateFormat DF_MDHM = new SimpleDateFormat("MM/dd HH:mm");

private static final SimpleDateFormat DF_YMDTHMS = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");

/**
* 判断是否是当天
*
* @param date
* @return <p>
*         true: 是当天
*         </p>
*         <p>
*         false: 不是当天
*         </p>
*/
public static boolean compareCurrDay(Date date) {
if (null == date) {
return false;
}
Calendar cal = Calendar.getInstance();
cal.setTime(date);
Calendar curr = Calendar.getInstance();
if (cal.get(Calendar.YEAR) == curr.get(Calendar.YEAR)
&& cal.get(Calendar.MONTH) == curr.get(Calendar.MONTH)
&& cal.get(Calendar.DAY_OF_MONTH) == curr
.get(Calendar.DAY_OF_MONTH)) {
return true;
}
return false;
}

/**
* 获得当前时间
*
* @return yyyyMMdd
*/
public static String getDisplayYMD() {
try {
Calendar calendar = Calendar.getInstance();
return ((SimpleDateFormat) DF_YMD.clone()).format(calendar
.getTime());
} catch (Exception e) {
return null;
}
}

/**
* 获得date时间
*
* @param date
* @return yyyyMMdd
*/
public static String getDisplayYMD(Date date) {
try {
if (null == date) {
return null;
}
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return ((SimpleDateFormat) DF_YMD.clone()).format(calendar
.getTime());
} catch (Exception e) {
return null;
}
}

/**
* 获得date时间
*
* @param date
* @return yyyy-MM-dd HH:mm:ss
*/
public static String getDisplayYMDHMS(Date date) {
try {
if (null == date) {
return null;
}
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return ((SimpleDateFormat) DF_YMDHMS.clone()).format(calendar
.getTime());
} catch (Exception e) {
return null;
}
}

/**
* 获得date时间
*
* @param date
* @return MM/dd HH:ss
*/
public static String getMDHM(Date date) {
try {
if (null == date) {
return "";
}
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return ((SimpleDateFormat) DF_MDHM.clone()).format(calendar
.getTime());
} catch (Exception e) {
return "";
}
}


/**
* 获得当前时间
*
* @return yyyy-MM-dd
*/
public static String getDisplayYMD2() {
try {
Calendar calendar = Calendar.getInstance();
return ((SimpleDateFormat) DF_YMD2.clone()).format(calendar
.getTime());
} catch (Exception e) {
return null;
}
}

/**
* 获得date时间
*
* @param date
* @return yyyy-MM-dd
*/
public static String getDisplayYMD2(Date date) {
try {
if (null == date) {
return null;
}
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return ((SimpleDateFormat) DF_YMD2.clone()).format(calendar
.getTime());
} catch (Exception e) {
return null;
}
}

/**
* 获得当前date时间
*
* @return yyyyMMddHHmmss
*/
public static String getDisplayYMDHHMMSS() {
try {
Calendar calendar = Calendar.getInstance();
return ((SimpleDateFormat) DF_YMDHMS2.clone()).format(calendar
.getTime());
} catch (Exception e) {
return null;
}
}

/**
* 比较时间
*
* @param date
*            比较的时间点
* @param field
*            日历
* @param amount
*            时间量
* @return
*/
public static boolean compareTime(Date date, int field, int amount) {
try {
Calendar cal = Calendar.getInstance();
cal.add(field, amount);

Calendar c = Calendar.getInstance();
c.setTime(date);

return cal.before(c);
} catch (Exception e) {
return false;
}
}

/**
* 取得日期
*
* @param date
*            yyyy-MM-dd
* @return
*/
public static Date getDate(String date) {
try {
return ((SimpleDateFormat) DF_YMD2.clone()).parse(date);
} catch (ParseException e) {
return null;
}
}

/**
* 取得日期
*
* @param date
*            MM/dd/yyyy hh:mm:ss AM
* @return
*/
public static Date getDateByMDYHMS(String date) {
try {
return ((SimpleDateFormat) DF_MDYHMS.clone()).parse(date);
} catch (ParseException e) {
return null;
}
}

/**
* 取得日期
*
* @param date
*            yyyy-MM-dd HH:mm:ss
* @return
*/
public static Date getDate2(String date) {
try {
return ((SimpleDateFormat) DF_YMDHMS.clone()).parse(date);
} catch (ParseException e) {
return null;
}
}

/**
* 取得日期
*
* @param date
*            2012-03-29T11:25:11+08:00
* @return
*/
public static Date getDateTime(String date) {
try {
if (StringUtil.isBlank(date))
return null;

return ((SimpleDateFormat) DF_YMDTHMS.clone()).parse(date);
} catch (Exception e) {
return null;
}
}


/**
* 时间间隔
*
* @param d1
* @param d2
* @return
*/
public static String getCompareTime(Date d1, Date d2) {
try {
SimpleDateFormat DF = new SimpleDateFormat("Z");
Calendar calendar = Calendar.getInstance();
String zone = ((SimpleDateFormat) DF.clone()).format(calendar
.getTime());
//LOG.info("当前时区：" + zone);

if (!StringUtil.isBlank(zone) && zone.length() >= 5) {
Integer z = Integer.valueOf(zone.substring(1));
if (zone.indexOf("-") != -1) {
z += 800;
} else {
z = 800 - z;
}
int t1 = z/100;
int t2 = z%100;
calendar.add(Calendar.HOUR_OF_DAY, t1);
calendar.add(Calendar.MINUTE, t2);

}

//LOG.info("中国时间：" + DF_MDYHMS.format(calendar.getTime()));

long currTime = calendar.getTimeInMillis();
long time = currTime - d1.getTime();


long day = time/(1000*60*60*24);
if (day > 0) {
long year = day/365;
if (year > 0) {
return  year + "y";
}

long month = day/30;
if (month > 0) {
return month + "M";
}

return day + "d";
}

long hour = time/(1000*60*60);
if (hour > 0) {
return hour + "h";
}
return time/(1000*60) + "m";

} catch (Exception e) {
return "";
}
}

public static void main(String[] args) {
//System.out.println(DateUtil.getDisplayYMDHMS(DateUtil.getDateByMDYHMS("11/23/2012 2:34:11 PM")));


try {
SimpleDateFormat DF = new SimpleDateFormat("Z");
Calendar calendar = Calendar.getInstance();
calendar.set(2013, 2, 20, 22, 30, 13);
String zone = "-0430";
System.out.println("当前时区：" + zone);

if (!StringUtil.isBlank(zone) && zone.length() >= 5) {
Integer z = Integer.valueOf(zone);
z = 800 - z;
int t1 = z/100;
int t2 = z%100;
calendar.add(Calendar.HOUR_OF_DAY, t1);
calendar.add(Calendar.MINUTE, t2);

}

System.out.println("中国时间：" + DF_MDYHMS.format(calendar.getTime()));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}