java Date时间格式工具类DateUtil
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- package com.common;
- import java.sql.Timestamp;
- import java.text.DateFormat;
- import java.text.ParseException;
- import java.text.SimpleDateFormat;
- import java.util.ArrayList;
- import java.util.Calendar;
- import java.util.Date;
- import java.util.GregorianCalendar;
- import java.util.HashMap;
- import java.util.Iterator;
- import java.util.LinkedHashMap;
- import java.util.List;
- /**
- * 日期工具类
- */
- public class DateUtil{
- // ==格式到年==
- /**
- * 日期格式,年份,例如:2004,2008
- */
- public static final String DATE_FORMAT_YYYY = "yyyy";
- // ==格式到年月 ==
- /**
- * 日期格式,年份和月份,例如:200707,200808
- */
- public static final String DATE_FORMAT_YYYYMM = "yyyyMM";
- /**
- * 日期格式,年份和月份,例如:200707,2008-08
- */
- public static final String DATE_FORMAT_YYYY_MM = "yyyy-MM";
- // ==格式到年月日==
- /**
- * 日期格式,年月日,例如:050630,080808
- */
- public static final String DATE_FORMAT_YYMMDD = "yyMMdd";
- /**
- * 日期格式,年月日,用横杠分开,例如:06-12-25,08-08-08
- */
- public static final String DATE_FORMAT_YY_MM_DD = "yy-MM-dd";
- /**
- * 日期格式,年月日,例如:20050630,20080808
- */
- public static final String DATE_FORMAT_YYYYMMDD = "yyyyMMdd";
- /**
- * 日期格式,年月日,用横杠分开,例如:2006-12-25,2008-08-08
- */
- public static final String DATE_FORMAT_YYYY_MM_DD = "yyyy-MM-dd";
- /**
- * 日期格式,年月日,例如:2016.10.05
- */
- public static final String DATE_FORMAT_POINTYYYYMMDD = "yyyy.MM.dd";
- /**
- * 日期格式,年月日,例如:2016年10月05日
- */
- public static final String DATE_TIME_FORMAT_YYYY年MM月DD日 = "yyyy年MM月dd日";
- // ==格式到年月日 时分 ==
- /**
- * 日期格式,年月日时分,例如:200506301210,200808081210
- */
- public static final String DATE_FORMAT_YYYYMMDDHHmm = "yyyyMMddHHmm";
- /**
- * 日期格式,年月日时分,例如:20001230 12:00,20080808 20:08
- */
- public static final String DATE_TIME_FORMAT_YYYYMMDD_HH_MI = "yyyyMMdd HH:mm";
- /**
- * 日期格式,年月日时分,例如:2000-12-30 12:00,2008-08-08 20:08
- */
- public static final String DATE_TIME_FORMAT_YYYY_MM_DD_HH_MI = "yyyy-MM-dd HH:mm";
- // ==格式到年月日 时分秒==
- /**
- * 日期格式,年月日时分秒,例如:20001230120000,20080808200808
- */
- public static final String DATE_TIME_FORMAT_YYYYMMDDHHMISS = "yyyyMMddHHmmss";
- /**
- * 日期格式,年月日时分秒,年月日用横杠分开,时分秒用冒号分开
- * 例如:2005-05-10 23:20:00,2008-08-08 20:08:08
- */
- public static final String DATE_TIME_FORMAT_YYYY_MM_DD_HH_MI_SS = "yyyy-MM-dd HH:mm:ss";
- // ==格式到年月日 时分秒 毫秒==
- /**
- * 日期格式,年月日时分秒毫秒,例如:20001230120000123,20080808200808456
- */
- public static final String DATE_TIME_FORMAT_YYYYMMDDHHMISSSSS = "yyyyMMddHHmmssSSS";
- // ==特殊格式==
- /**
- * 日期格式,月日时分,例如:10-05 12:00
- */
- public static final String DATE_FORMAT_MMDDHHMI = "MM-dd HH:mm";
- /* ************工具方法*************** */
- /**
- * 获取某日期的年份
- * @param date
- * @return
- */
- public static Integer getYear(Date date) {
- Calendar cal = Calendar.getInstance();
- cal.setTime(date);
- return cal.get(Calendar.YEAR);
- }
- /**
- * 获取某日期的月份
- * @param date
- * @return
- */
- public static Integer getMonth(Date date) {
- Calendar cal = Calendar.getInstance();
- cal.setTime(date);
- return cal.get(Calendar.MONTH) + 1;
- }
- /**
- * 获取某日期的日数
- * @param date
- * @return
- */
- public static Integer getDay(Date date){
- Calendar cal = Calendar.getInstance();
- cal.setTime(date);
- int day=cal.get(Calendar.DATE);//获取日
- return day;
- }
- /**
- * 格式化Date时间
- * @param time Date类型时间
- * @param timeFromat String类型格式
- * @return 格式化后的字符串
- */
- public static String parseDateToStr(Date time, String timeFromat){
- DateFormat dateFormat=new SimpleDateFormat(timeFromat);
- return dateFormat.format(time);
- }
- /**
- * 格式化Timestamp时间
- * @param timestamp Timestamp类型时间
- * @param timeFromat
- * @return 格式化后的字符串
- */
- public static String parseTimestampToStr(Timestamp timestamp,String timeFromat){
- SimpleDateFormat df = new SimpleDateFormat(timeFromat);
- return df.format(timestamp);
- }
- /**
- * 格式化Date时间
- * @param time Date类型时间
- * @param timeFromat String类型格式
- * @param defaultValue 默认值为当前时间Date
- * @return 格式化后的字符串
- */
- public static String parseDateToStr(Date time, String timeFromat, final Date defaultValue){
- try{
- DateFormat dateFormat=new SimpleDateFormat(timeFromat);
- return dateFormat.format(time);
- }catch (Exception e){
- if(defaultValue!=null)
- return parseDateToStr(defaultValue, timeFromat);
- else
- return parseDateToStr(new Date(), timeFromat);
- }
- }
- /**
- * 格式化Date时间
- * @param time Date类型时间
- * @param timeFromat String类型格式
- * @param defaultValue 默认时间值String类型
- * @return 格式化后的字符串
- */
- public static String parseDateToStr(Date time, String timeFromat, final String defaultValue){
- try{
- DateFormat dateFormat=new SimpleDateFormat(timeFromat);
- return dateFormat.format(time);
- }catch (Exception e){
- return defaultValue;
- }
- }
- /**
- * 格式化String时间
- * @param time String类型时间
- * @param timeFromat String类型格式
- * @return 格式化后的Date日期
- */
- public static Date parseStrToDate(String time, String timeFromat) {
- if (time == null || time.equals("")) {
- return null;
- }
- Date date=null;
- try{
- DateFormat dateFormat=new SimpleDateFormat(timeFromat);
- date=dateFormat.parse(time);
- }catch(Exception e){
- }
- return date;
- }
- /**
- * 格式化String时间
- * @param strTime String类型时间
- * @param timeFromat String类型格式
- * @param defaultValue 异常时返回的默认值
- * @return
- */
- public static Date parseStrToDate(String strTime, String timeFromat,
- Date defaultValue) {
- try {
- DateFormat dateFormat = new SimpleDateFormat(timeFromat);
- return dateFormat.parse(strTime);
- } catch (Exception e) {
- return defaultValue;
- }
- }
- /**
- * 当strTime为2008-9时返回为2008-9-1 00:00格式日期时间,无法转换返回null.
- * @param strTime
- * @return
- */
- public static Date strToDate(String strTime) {
- if(strTime==null || strTime.trim().length()<=0)
- return null;
- Date date = null;
- List<String> list = new ArrayList<String>(0);
- list.add(DATE_TIME_FORMAT_YYYY_MM_DD_HH_MI_SS);
- list.add(DATE_TIME_FORMAT_YYYYMMDDHHMISSSSS);
- list.add(DATE_TIME_FORMAT_YYYY_MM_DD_HH_MI);
- list.add(DATE_TIME_FORMAT_YYYYMMDD_HH_MI);
- list.add(DATE_TIME_FORMAT_YYYYMMDDHHMISS);
- list.add(DATE_FORMAT_YYYY_MM_DD);
- //list.add(DATE_FORMAT_YY_MM_DD);
- list.add(DATE_FORMAT_YYYYMMDD);
- list.add(DATE_FORMAT_YYYY_MM);
- list.add(DATE_FORMAT_YYYYMM);
- list.add(DATE_FORMAT_YYYY);
- for (Iterator iter = list.iterator(); iter.hasNext();) {
- String format = (String) iter.next();
- if(strTime.indexOf("-")>0 && format.indexOf("-")<0)
- continue;
- if(strTime.indexOf("-")<0 && format.indexOf("-")>0)
- continue;
- if(strTime.length()>format.length())
- continue;
- date = parseStrToDate(strTime, format);
- if (date != null)
- break;
- }
- return date;
- }
- /**
- * 解析两个日期之间的所有月份
- * @param beginDateStr 开始日期,至少精确到yyyy-MM
- * @param endDateStr 结束日期,至少精确到yyyy-MM
- * @return yyyy-MM日期集合
- */
- public static List<String> getMonthListOfDate(String beginDateStr, String endDateStr) {
- // 指定要解析的时间格式
- SimpleDateFormat f = new SimpleDateFormat("yyyy-MM");
- // 返回的月份列表
- String sRet = "";
- // 定义一些变量
- Date beginDate = null;
- Date endDate = null;
- GregorianCalendar beginGC = null;
- GregorianCalendar endGC = null;
- List<String> list = new ArrayList<String>();
- try {
- // 将字符串parse成日期
- beginDate = f.parse(beginDateStr);
- endDate = f.parse(endDateStr);
- // 设置日历
- beginGC = new GregorianCalendar();
- beginGC.setTime(beginDate);
- endGC = new GregorianCalendar();
- endGC.setTime(endDate);
- // 直到两个时间相同
- while (beginGC.getTime().compareTo(endGC.getTime()) <= 0) {
- sRet = beginGC.get(Calendar.YEAR) + "-"
- + (beginGC.get(Calendar.MONTH) + 1);
- list.add(sRet);
- // 以月为单位,增加时间
- beginGC.add(Calendar.MONTH, 1);
- }
- return list;
- } catch (Exception e) {
- e.printStackTrace();
- return null;
- }
- }
- /**
- * 解析两个日期段之间的所有日期
- * @param beginDateStr 开始日期 ,至少精确到yyyy-MM-dd
- * @param endDateStr 结束日期 ,至少精确到yyyy-MM-dd
- * @return yyyy-MM-dd日期集合
- */
- public static List<String> getDayListOfDate(String beginDateStr, String endDateStr) {
- // 指定要解析的时间格式
- SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");
- // 定义一些变量
- Date beginDate = null;
- Date endDate = null;
- Calendar beginGC = null;
- Calendar endGC = null;
- List<String> list = new ArrayList<String>();
- try {
- // 将字符串parse成日期
- beginDate = f.parse(beginDateStr);
- endDate = f.parse(endDateStr);
- // 设置日历
- beginGC = Calendar.getInstance();
- beginGC.setTime(beginDate);
- endGC = Calendar.getInstance();
- endGC.setTime(endDate);
- SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
- // 直到两个时间相同
- while (beginGC.getTime().compareTo(endGC.getTime()) <= 0) {
- list.add(sdf.format(beginGC.getTime()));
- // 以日为单位,增加时间
- beginGC.add(Calendar.DAY_OF_MONTH, 1);
- }
- return list;
- } catch (Exception e) {
- e.printStackTrace();
- return null;
- }
- }
- /**
- * 获取当下年份指定前后数量的年份集合
- * @param before 当下年份前年数
- * @param behind 当下年份后年数
- * @return 集合
- */
- public static List<Integer> getYearListOfYears(int before,int behind) {
- if (before<0 || behind<0) {
- return null;
- }
- List<Integer> list = new ArrayList<Integer>();
- Calendar c = null;
- c = Calendar.getInstance();
- c.setTime(new Date());
- int currYear = Calendar.getInstance().get(Calendar.YEAR);
- int startYear = currYear - before;
- int endYear = currYear + behind;
- for (int i = startYear; i < endYear; i++) {
- list.add(Integer.valueOf(i));
- }
- return list;
- }
- /**
- * 获取当前日期是一年中第几周
- * @param date
- * @return
- */
- public static Integer getWeekthOfYear(Date date) {
- Calendar c = new GregorianCalendar();
- c.setFirstDayOfWeek(Calendar.MONDAY);
- c.setMinimalDaysInFirstWeek(7);
- c.setTime(date);
- return c.get(Calendar.WEEK_OF_YEAR);
- }
- /**
- * 获取某一年各星期的始终时间
- * 实例:getWeekList(2016),第52周(从2016-12-26至2017-01-01)
- * @param 年份
- * @return
- */
- public static HashMap<Integer,String> getWeekTimeOfYear(int year) {
- HashMap<Integer,String> map = new LinkedHashMap<Integer,String>();
- Calendar c = new GregorianCalendar();
- c.set(year, Calendar.DECEMBER, 31, 23, 59, 59);
- int count = getWeekthOfYear(c.getTime());
- SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
- String dayOfWeekStart = "";
- String dayOfWeekEnd = "";
- for (int i = 1; i <= count; i++) {
- dayOfWeekStart = sdf.format(getFirstDayOfWeek(year, i));
- dayOfWeekEnd = sdf.format(getLastDayOfWeek(year, i));
- map.put(Integer.valueOf(i), "第"+i+"周(从"+dayOfWeekStart + "至" + dayOfWeekEnd+")");
- }
- return map;
- }
- /**
- * 获取某一年的总周数
- * @param year
- * @return
- */
- public static Integer getWeekCountOfYear(int year){
- Calendar c = new GregorianCalendar();
- c.set(year, Calendar.DECEMBER, 31, 23, 59, 59);
- int count = getWeekthOfYear(c.getTime());
- return count;
- }
- /**
- * 获取指定日期所在周的第一天
- * @param date
- * @return
- */
- public static Date getFirstDayOfWeek(Date date) {
- Calendar c = new GregorianCalendar();
- c.setFirstDayOfWeek(Calendar.MONDAY);
- c.setTime(date);
- c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); // Monday
- return c.getTime();
- }
- /**
- * 获取指定日期所在周的最后一天
- * @param date
- * @return
- */
- public static Date getLastDayOfWeek(Date date) {
- Calendar c = new GregorianCalendar();
- c.setFirstDayOfWeek(Calendar.MONDAY);
- c.setTime(date);
- c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); // Sunday
- return c.getTime();
- }
- /**
- * 获取某年某周的第一天
- * @param year 目标年份
- * @param week 目标周数
- * @return
- */
- public static Date getFirstDayOfWeek(int year, int week) {
- Calendar c = new GregorianCalendar();
- c.set(Calendar.YEAR, year);
- c.set(Calendar.MONTH, Calendar.JANUARY);
- c.set(Calendar.DATE, 1);
- Calendar cal = (GregorianCalendar) c.clone();
- cal.add(Calendar.DATE, week * 7);
- return getFirstDayOfWeek(cal.getTime());
- }
- /**
- * 获取某年某周的最后一天
- * @param year 目标年份
- * @param week 目标周数
- * @return
- */
- public static Date getLastDayOfWeek(int year, int week) {
- Calendar c = new GregorianCalendar();
- c.set(Calendar.YEAR, year);
- c.set(Calendar.MONTH, Calendar.JANUARY);
- c.set(Calendar.DATE, 1);
- Calendar cal = (GregorianCalendar) c.clone();
- cal.add(Calendar.DATE, week * 7);
- return getLastDayOfWeek(cal.getTime());
- }
- /**
- * 获取某年某月的第一天
- * @param year 目标年份
- * @param month 目标月份
- * @return
- */
- public static Date getFirstDayOfMonth(int year,int month){
- month = month-1;
- Calendar c = Calendar.getInstance();
- c.set(Calendar.YEAR, year);
- c.set(Calendar.MONTH, month);
- int day = c.getActualMinimum(c.DAY_OF_MONTH);
- c.set(Calendar.DAY_OF_MONTH, day);
- c.set(Calendar.HOUR_OF_DAY, 0);
- c.set(Calendar.MINUTE, 0);
- c.set(Calendar.SECOND, 0);
- c.set(Calendar.MILLISECOND, 0);
- return c.getTime();
- }
- /**
- * 获取某年某月的最后一天
- * @param year 目标年份
- * @param month 目标月份
- * @return
- */
- public static Date getLastDayOfMonth(int year,int month){
- month = month-1;
- Calendar c = Calendar.getInstance();
- c.set(Calendar.YEAR, year);
- c.set(Calendar.MONTH, month);
- int day = c.getActualMaximum(c.DAY_OF_MONTH);
- c.set(Calendar.DAY_OF_MONTH, day);
- c.set(Calendar.HOUR_OF_DAY, 23);
- c.set(Calendar.MINUTE, 59);
- c.set(Calendar.SECOND, 59);
- c.set(Calendar.MILLISECOND, 999);
- return c.getTime();
- }
- /**
- * 获取某个日期为星期几
- * @param date
- * @return String "星期*"
- */
- public static String getDayWeekOfDate1(Date date) {
- String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
- Calendar cal = Calendar.getInstance();
- cal.setTime(date);
- int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
- if (w < 0)
- w = 0;
- return weekDays[w];
- }
- /**
- * 获得指定日期的星期几数
- * @param date
- * @return int
- */
- public static Integer getDayWeekOfDate2(Date date){
- Calendar aCalendar = Calendar.getInstance();
- aCalendar.setTime(date);
- int weekDay = aCalendar.get(Calendar.DAY_OF_WEEK);
- return weekDay;
- }
- /**
- * 验证字符串是否为日期
- * 验证格式:YYYYMMDD、YYYY_MM_DD、YYYYMMDDHHMISS、YYYYMMDD_HH_MI、YYYY_MM_DD_HH_MI、YYYYMMDDHHMISSSSS、YYYY_MM_DD_HH_MI_SS
- * @param strTime
- * @return null时返回false;true为日期,false不为日期
- */
- public static boolean validateIsDate(String strTime) {
- if (strTime == null || strTime.trim().length() <= 0)
- return false;
- Date date = null;
- List<String> list = new ArrayList<String>(0);
- list.add(DATE_TIME_FORMAT_YYYY_MM_DD_HH_MI_SS);
- list.add(DATE_TIME_FORMAT_YYYYMMDDHHMISSSSS);
- list.add(DATE_TIME_FORMAT_YYYY_MM_DD_HH_MI);
- list.add(DATE_TIME_FORMAT_YYYYMMDD_HH_MI);
- list.add(DATE_TIME_FORMAT_YYYYMMDDHHMISS);
- list.add(DATE_FORMAT_YYYY_MM_DD);
- //list.add(DATE_FORMAT_YY_MM_DD);
- list.add(DATE_FORMAT_YYYYMMDD);
- //list.add(DATE_FORMAT_YYYY_MM);
- //list.add(DATE_FORMAT_YYYYMM);
- //list.add(DATE_FORMAT_YYYY);
- for (Iterator iter = list.iterator(); iter.hasNext();) {
- String format = (String) iter.next();
- if(strTime.indexOf("-")>0 && format.indexOf("-")<0)
- continue;
- if(strTime.indexOf("-")<0 && format.indexOf("-")>0)
- continue;
- if(strTime.length()>format.length())
- continue;
- date = parseStrToDate(strTime.trim(), format);
- if (date != null)
- break;
- }
- if (date != null) {
- System.out.println("生成的日期:"+DateUtil.parseDateToStr(date, DateUtil.DATE_TIME_FORMAT_YYYY_MM_DD_HH_MI_SS, "--null--"));
- return true;
- }
- return false;
- }
- /**
- * 将指定日期的时分秒格式为零
- * @param date
- * @return
- */
- public static Date formatHhMmSsOfDate(Date date) {
- Calendar cal = Calendar.getInstance();
- cal.setTime(date);
- cal.set(Calendar.HOUR_OF_DAY, 0);
- cal.set(Calendar.MINUTE, 0);
- cal.set(Calendar.SECOND, 0);
- cal.set(Calendar.MILLISECOND, 0);
- return cal.getTime();
- }
- /**
- * 获得指定时间加减参数后的日期(不计算则输入0)
- * @param date 指定日期
- * @param year 年数,可正可负
- * @param month 月数,可正可负
- * @param day 天数,可正可负
- * @param hour 小时数,可正可负
- * @param minute 分钟数,可正可负
- * @param second 秒数,可正可负
- * @param millisecond 毫秒数,可正可负
- * @return 计算后的日期
- */
- public static Date addDate(Date date,int year,int month,int day,int hour,int minute,int second,int millisecond){
- Calendar c = Calendar.getInstance();
- c.setTime(date);
- c.add(Calendar.YEAR, year);//加减年数
- c.add(Calendar.MONTH, month);//加减月数
- c.add(Calendar.DATE, day);//加减天数
- c.add(Calendar.HOUR,hour);//加减小时数
- c.add(Calendar.MINUTE, minute);//加减分钟数
- c.add(Calendar.SECOND, second);//加减秒
- c.add(Calendar.MILLISECOND, millisecond);//加减毫秒数
- return c.getTime();
- }
- /**
- * 获得两个日期的时间戳之差
- * @param startDate
- * @param endDate
- * @return
- */
- public static Long getDistanceTimestamp(Date startDate,Date endDate){
- long daysBetween=(endDate.getTime()-startDate.getTime()+1000000)/(3600*24*1000);
- return daysBetween;
- }
- /**
- * 判断二个时间是否为同年同月
- * @param date1
- * @param date2
- * @return
- */
- public static Boolean compareIsSameMonth(Date date1,Date date2){
- boolean flag = false;
- int year1 = getYear(date1);
- int year2 = getYear(date2);
- if(year1 == year2){
- int month1 = getMonth(date1);
- int month2 = getMonth(date2);
- if(month1 == month2)flag = true;
- }
- return flag;
- }
- /**
- * 获得两个时间相差距离多少天多少小时多少分多少秒
- * @param str1 时间参数 1 格式:1990-01-01 12:00:00
- * @param str2 时间参数 2 格式:2009-01-01 12:00:00
- * @return long[] 返回值为:{天, 时, 分, 秒}
- */
- public static long[] getDistanceTime(Date one, Date two) {
- long day = 0;
- long hour = 0;
- long min = 0;
- long sec = 0;
- try {
- long time1 = one.getTime();
- long time2 = two.getTime();
- long diff ;
- if(time1<time2) {
- diff = time2 - time1;
- } else {
- diff = time1 - time2;
- }
- day = diff / (24 * 60 * 60 * 1000);
- hour = (diff / (60 * 60 * 1000) - day * 24);
- min = ((diff / (60 * 1000)) - day * 24 * 60 - hour * 60);
- sec = (diff/1000-day*24*60*60-hour*60*60-min*60);
- } catch (Exception e) {
- e.printStackTrace();
- }
- long[] times = {day, hour, min, sec};
- return times;
- }
- /**
- * 两个时间相差距离多少天多少小时多少分多少秒
- * @param str1 时间参数 1 格式:1990-01-01 12:00:00
- * @param str2 时间参数 2 格式:2009-01-01 12:00:00
- * @return String 返回值为:{天, 时, 分, 秒}
- */
- public static long[] getDistanceTime(String str1, String str2) {
- DateFormat df = new SimpleDateFormat(DATE_TIME_FORMAT_YYYY_MM_DD_HH_MI_SS);
- Date one;
- Date two;
- long day = 0;
- long hour = 0;
- long min = 0;
- long sec = 0;
- try {
- one = df.parse(str1);
- two = df.parse(str2);
- long time1 = one.getTime();
- long time2 = two.getTime();
- long diff ;
- if(time1<time2) {
- diff = time2 - time1;
- } else {
- diff = time1 - time2;
- }
- day = diff / (24 * 60 * 60 * 1000);
- hour = (diff / (60 * 60 * 1000) - day * 24);
- min = ((diff / (60 * 1000)) - day * 24 * 60 - hour * 60);
- sec = (diff/1000-day*24*60*60-hour*60*60-min*60);
- } catch (ParseException e) {
- e.printStackTrace();
- }
- long[] times = {day, hour, min, sec};
- return times;
- }
- /**
- * 两个时间之间相差距离多少天
- * @param one 时间参数 1:
- * @param two 时间参数 2:
- * @return 相差天数
- */
- public static Long getDistanceDays(String str1, String str2) throws Exception{
- DateFormat df = new SimpleDateFormat(DATE_TIME_FORMAT_YYYY_MM_DD_HH_MI_SS);
- Date one;
- Date two;
- long days=0;
- try {
- one = df.parse(str1);
- two = df.parse(str2);
- long time1 = one.getTime();
- long time2 = two.getTime();
- long diff ;
- if(time1<time2) {
- diff = time2 - time1;
- } else {
- diff = time1 - time2;
- }
- days = diff / (1000 * 60 * 60 * 24);
- } catch (ParseException e) {
- e.printStackTrace();
- }
- return days;
- }
- /**
- * 获取指定时间的那天 00:00:00.000 的时间
- * @param date
- * @return
- */
- public static Date getDayBeginTime(final Date date) {
- Calendar c = Calendar.getInstance();
- c.setTime(date);
- c.set(Calendar.HOUR_OF_DAY, 0);
- c.set(Calendar.MINUTE, 0);
- c.set(Calendar.SECOND, 0);
- c.set(Calendar.MILLISECOND, 0);
- return c.getTime();
- }
- /**
- * 获取指定时间的那天 23:59:59.999 的时间
- * @param date
- * @return
- */
- public static Date getDayEndTime(final Date date) {
- Calendar c = Calendar.getInstance();
- c.setTime(date);
- c.set(Calendar.HOUR_OF_DAY, 23);
- c.set(Calendar.MINUTE, 59);
- c.set(Calendar.SECOND, 59);
- c.set(Calendar.MILLISECOND, 999);
- return c.getTime();
- }
- public static void main(String [] args){
- try {
- DateUtil dateUtil = new DateUtil();
- System.out.println();
- } catch (Exception e) {
- // TODO: handle exception
- }
- }
- }
http://blog.csdn.net/w410589502/article/details/54342192