标签：dateutil
package com.wiseweb.util;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class DateUtil {
private static String ymdhms = "yyyy-MM-dd HH:mm:ss";
private static String ymd = "yyyy-MM-dd";
public static SimpleDateFormat ymdSDF = new SimpleDateFormat(ymd);
private static String year = "yyyy";
private static String month = "MM";
private static String day = "dd";
public static SimpleDateFormat yyyyMMddHHmmss = new SimpleDateFormat(ymdhms);
public static SimpleDateFormat yearSDF = new SimpleDateFormat(year);
public static SimpleDateFormat monthSDF = new SimpleDateFormat(month);
public static SimpleDateFormat daySDF = new SimpleDateFormat(day);
public static SimpleDateFormat yyyyMMddHHmm = new SimpleDateFormat(
"yyyy-MM-dd HH:mm");
public static SimpleDateFormat yyyyMMdd = new SimpleDateFormat("yyyy-MM-dd");
public static SimpleDateFormat yyyyMMddHH_NOT_ = new SimpleDateFormat(
"yyyyMMdd");
public static long DATEMM = 86400L;
public static String getCurrentTime() {
return yyyyMMddHHmmss.format(new Date());
}
public static String getYesterdayYYYYMMDD() {
Date date = new Date(System.currentTimeMillis() - DATEMM * 1000L);
String str = yyyyMMdd.format(date);
try {
date = yyyyMMddHHmmss.parse(str + " 00:00:00");
return yyyyMMdd.format(date);
} catch (ParseException e) {
e.printStackTrace();
}
return "";
}
public static String getCurrentYear() {
return yearSDF.format(new Date());
}
public static String getCurrentMonth() {
return monthSDF.format(new Date());
}
public static String getCurrentDay() {
return daySDF.format(new Date());
}
public static String getCurrentymd() {
return ymdSDF.format(new Date());
}
public static long getTimeNumberToday() {
Date date = new Date();
String str = yyyyMMdd.format(date);
try {
date = yyyyMMdd.parse(str);
return date.getTime() / 1000L;
} catch (ParseException e) {
e.printStackTrace();
}
return 0L;
}
public static String getTodateString() {
Date date = new Date(System.currentTimeMillis());
String str = yyyyMMddHH_NOT_.format(date);
return str;
}
public static String getString(Date date) {
String str = yyyyMMddHHmmss.format(date);
return str;
}
public static String getYesterdayString() {
Date date = new Date(System.currentTimeMillis() - DATEMM * 1000L);
String str = yyyyMMddHH_NOT_.format(date);
return str;
}
/**
* 获得昨天零点
*
* @return
*/
public static Date getYesterDayZeroHour() {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, -1);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.HOUR, 0);
return cal.getTime();
}
/**
* 把long型日期转String ；---OK
*
* @param date
* long型日期；
* @param format
* 日期格式；
* @return
*/
public static String longToString(long date, String format) {
SimpleDateFormat sdf = new SimpleDateFormat(format);
// 前面的lSysTime是秒数，先乘1000得到毫秒数，再转为java.util.Date类型
java.util.Date dt2 = new Date(date * 1000L);
String sDateTime = sdf.format(dt2); // 得到精确到秒的表示：08/31/2006 21:08:00
return sDateTime;
}
/**
* 获得今天零点
*
* @return
*/
public static Date getTodayZeroHour() {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.HOUR, 0);
return cal.getTime();
}
/**
* 获得昨天23时59分59秒
*
* @return
*/
public static Date getYesterDay24Hour() {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, -1);
cal.set(Calendar.SECOND, 59);
cal.set(Calendar.MINUTE, 59);
cal.set(Calendar.HOUR, 23);
return cal.getTime();
}
/**
* String To Date ---OK
*
* @param date
* 待转换的字符串型日期；
* @param format
* 转化的日期格式
* @return 返回该字符串的日期型数据；
*/
public static Date stringToDate(String date, String format) {
SimpleDateFormat sdf = new SimpleDateFormat(format);
try {
return sdf.parse(date);
} catch (ParseException e) {
return null;
}
}
/**
* 获得指定日期所在的自然周的第一天，即周日
*
* @param date
* 日期
* @return 自然周的第一天
*/
public static Date getStartDayOfWeek(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK, 1);
date = c.getTime();
return date;
}
/**
* 获得指定日期所在的自然周的最后一天，即周六
*
* @param date
* @return
*/
public static Date getLastDayOfWeek(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_WEEK, 7);
date = c.getTime();
return date;
}
/**
* 获得指定日期所在当月第一天
*
* @param date
* @return
*/
public static Date getStartDayOfMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_MONTH, 1);
date = c.getTime();
return date;
}
/**
* 获得指定日期所在当月最后一天
*
* @param date
* @return
*/
public static Date getLastDayOfMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DATE, 1);
c.add(Calendar.MONTH, 1);
c.add(Calendar.DATE, -1);
date = c.getTime();
return date;
}
/**
* 获得指定日期的下一个月的第一天
*
* @param date
* @return
*/
public static Date getStartDayOfNextMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.add(Calendar.MONTH, 1);
c.set(Calendar.DAY_OF_MONTH, 1);
date = c.getTime();
return date;
}
/**
* 获得指定日期的下一个月的最后一天
*
* @param date
* @return
*/
public static Date getLastDayOfNextMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DATE, 1);
c.add(Calendar.MONTH, 2);
c.add(Calendar.DATE, -1);
date = c.getTime();
return date;
}
/**
*
* 求某一个时间向前多少秒的时间(currentTimeToBefer)---OK
*
* @param givedTime
* 给定的时间
* @param interval
* 间隔时间的毫秒数；计算方式 ：n(天)*24(小时)*60(分钟)*60(秒)(类型)
* @param format_Date_Sign
* 输出日期的格式；如yyyy-MM-dd、yyyyMMdd等；
*/
public static String givedTimeToBefer(String givedTime, long interval,
String format_Date_Sign) {
String tomorrow = null;
try {
SimpleDateFormat sdf = new SimpleDateFormat(format_Date_Sign);
Date gDate = sdf.parse(givedTime);
long current = gDate.getTime(); // 将Calendar表示的时间转换成毫秒
long beforeOrAfter = current - interval * 1000L; // 将Calendar表示的时间转换成毫秒
Date date = new Date(beforeOrAfter); // 用timeTwo作参数构造date2
tomorrow = new SimpleDateFormat(format_Date_Sign).format(date);
} catch (ParseException e) {
e.printStackTrace();
}
return tomorrow;
}
/**
* 把String 日期转换成long型日期；---OK
*
* @param date
* String 型日期；
* @param format
* 日期格式；
* @return
*/
public static long stringToLong(String date, String format) {
SimpleDateFormat sdf = new SimpleDateFormat(format);
Date dt2 = null;
long lTime = 0;
try {
dt2 = sdf.parse(date);
// 继续转换得到秒数的long型
lTime = dt2.getTime() / 1000;
} catch (ParseException e) {
e.printStackTrace();
}
return lTime;
}
/**
* 得到二个日期间的间隔日期；
*
* @param endTime
* 结束时间
* @param beginTime
* 开始时间
* @param isEndTime
* 是否包含结束日期；
* @return
*/
public static Map<String, String> getTwoDay(String endTime,
String beginTime, boolean isEndTime) {
Map<String, String> result = new HashMap<String, String>();
if ((endTime == null || endTime.equals("") || (beginTime == null || beginTime
.equals(""))))
return null;
try {
java.util.Date date = ymdSDF.parse(endTime);
endTime = ymdSDF.format(date);
java.util.Date mydate = ymdSDF.parse(beginTime);
long day = (date.getTime() - mydate.getTime())
/ (24 * 60 * 60 * 1000);
result = getDate(endTime, Integer.parseInt(day + ""), isEndTime);
} catch (Exception e) {
}
return result;
}
/**
* 得到二个日期间的间隔日期；
*
* @param endTime
* 结束时间
* @param beginTime
* 开始时间
* @param isEndTime
* 是否包含结束日期；
* @return
*/
public static Integer getTwoDayInterval(String endTime, String beginTime,
boolean isEndTime) {
if ((endTime == null || endTime.equals("") || (beginTime == null || beginTime
.equals(""))))
return 0;
long day = 0l;
try {
java.util.Date date = ymdSDF.parse(endTime);
endTime = ymdSDF.format(date);
java.util.Date mydate = ymdSDF.parse(beginTime);
day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
} catch (Exception e) {
return 0 ;
}
return Integer.parseInt(day + "");
}
/**
* 根据结束时间以及间隔差值，求符合要求的日期集合；
*
* @param endTime
* @param interval
* @param isEndTime
* @return
*/
public static Map<String, String> getDate(String endTime, Integer interval,
boolean isEndTime) {
Map<String, String> result = new HashMap<String, String>();
if (interval == 0 || isEndTime) {
if (isEndTime)
result.put(endTime, endTime);
}
if (interval > 0) {
int begin = 0;
for (int i = begin; i < interval; i++) {
endTime = givedTimeToBefer(endTime, DATEMM, ymd);
result.put(endTime, endTime);
}
}
return result;
}
@SuppressWarnings("unchecked")
public static String getFirstDate(String endTime, int intervalTime) {
Map<String, String> result = DateUtil.getDate(endTime, intervalTime,
true);
result = ElintUtil.sortByValue(result, true);
Set<String> keySet = result.keySet();
Iterator<String> it = keySet.iterator();
return it.next();
}
public static void main(String[] a) { }
}
标签：dateutil
原文地址：http://blog.csdn.net/benjamin_whx/article/details/40344669
