Java中Date转换大全，返回yyyy-MM-dd的Date类型
?/**
? * 获取现在时间,这个好用
? *
? * @return返回长时间格式 yyyy-MM-dd HH:mm:ss
? */
?public static Date getSqlDate() {
??Date sqlDate = new java.sql.Date(new Date().getTime());
??return sqlDate;
?}
?/**
? * 获取现在时间
? *
? * @return返回长时间格式 yyyy-MM-dd HH:mm:ss
? */
?public static Date getNowDate() {
??Date currentTime = new Date();
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??String dateString = formatter.format(currentTime);
??ParsePosition pos = new ParsePosition(8);
??Date currentTime_2 = formatter.parse(dateString, pos);
??return currentTime_2;
?}
?/**
? * 获取现在时间
? *
? * @return返回短时间格式 yyyy-MM-dd
? */
?public static Date getNowDateShort() {
??Date currentTime = new Date();
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
??String dateString = formatter.format(currentTime);
??ParsePosition pos = new ParsePosition(8);
??Date currentTime_2 = formatter.parse(dateString, pos);
??return currentTime_2;
?}
?/**
? * 获取现在时间
? *
? * @return返回字符串格式 yyyy-MM-dd HH:mm:ss
? */
?public static String getStringDate() {
??Date currentTime = new Date();
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??String dateString = formatter.format(currentTime);
??return dateString;
?}
?/**
? * 获取现在时间
? *
? * @return 返回短时间字符串格式yyyy-MM-dd
? */
?public static String getStringDateShort() {
??Date currentTime = new Date();
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
??String dateString = formatter.format(currentTime);
??return dateString;
?}
?/**
? * 获取时间 小时:分;秒 HH:mm:ss
? *
? * @return
? */
?public static String getTimeShort() {
??SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");
??Date currentTime = new Date();
??String dateString = formatter.format(currentTime);
??return dateString;
?}
?/**
? * 将长时间格式字符串转换为时间 yyyy-MM-dd HH:mm:ss
? *
? * @param strDate
? * @return
? */
?public static Date strToDateLong(String strDate) {
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??ParsePosition pos = new ParsePosition(0);
??Date strtodate = formatter.parse(strDate, pos);
??return strtodate;
?}
?/**
? * 将长时间格式时间转换为字符串 yyyy-MM-dd HH:mm:ss
? *
? * @param dateDate
? * @return
? */
?public static String dateToStrLong(java.util.Date dateDate) {
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??String dateString = formatter.format(dateDate);
??return dateString;
?}
?/**
? * 将短时间格式时间转换为字符串 yyyy-MM-dd
? *
? * @param dateDate
? * @param k
? * @return
? */
?public static String dateToStr(java.util.Date dateDate) {
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
??String dateString = formatter.format(dateDate);
??return dateString;
?}
?/**
? * 将短时间格式字符串转换为时间 yyyy-MM-dd
? *
? * @param strDate
? * @return
? */
?public static Date strToDate(String strDate) {
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
??ParsePosition pos = new ParsePosition(0);
??Date strtodate = formatter.parse(strDate, pos);
??return strtodate;
?}
?/**
? * 得到现在时间
? *
? * @return
? */
?public static Date getNow() {
??Date currentTime = new Date();
??return currentTime;
?}
?/**
? * 提取一个月中的最后一天
? *
? * @param day
? * @return
? */
?public static Date getLastDate(long day) {
??Date date = new Date();
??long date_3_hm = date.getTime() - 3600000 * 34 * day;
??Date date_3_hm_date = new Date(date_3_hm);
??return date_3_hm_date;
?}
?/**
? * 得到现在时间
? *
? * @return 字符串 yyyyMMdd HHmmss
? */
?public static String getStringToday() {
??Date currentTime = new Date();
??SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd HHmmss");
??String dateString = formatter.format(currentTime);
??return dateString;
?}
?/**
? * 得到现在小时
? */
?public static String getHour() {
??Date currentTime = new Date();
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??String dateString = formatter.format(currentTime);
??String hour;
??hour = dateString.substring(11, 13);
??return hour;
?}
?/**
? * 得到现在分钟
? *
? * @return
? */
?public static String getTime() {
??Date currentTime = new Date();
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??String dateString = formatter.format(currentTime);
??String min;
??min = dateString.substring(14, 16);
??return min;
?}
?/**
? * 根据用户传入的时间表示格式，返回当前时间的格式 如果是yyyyMMdd，注意字母y不能大写。
? *
? * @param sformat
? *??????????? yyyyMMddhhmmss
? * @return
? */
?public static String getUserDate(String sformat) {
??Date currentTime = new Date();
??SimpleDateFormat formatter = new SimpleDateFormat(sformat);
??String dateString = formatter.format(currentTime);
??return dateString;
?}
?/**
? * 二个小时时间间的差值,必须保证二个时间都是"HH:MM"的格式，返回字符型的分钟
? */
?public static String getTwoHour(String st1, String st2) {
??String[] kk = null;
??String[] jj = null;
??kk = st1.split(":");
??jj = st2.split(":");
??if (Integer.parseInt(kk[0]) < Integer.parseInt(jj[0]))
???return "0";
??else {
???double y = Double.parseDouble(kk[0]) + Double.parseDouble(kk[1])
?????/ 60;
???double u = Double.parseDouble(jj[0]) + Double.parseDouble(jj[1])
?????/ 60;
???if ((y - u) > 0)
????return y - u + "";
???else
????return "0";
??}
?}
?/**
? * 得到二个日期间的间隔天数
? */
?public static String getTwoDay(String sj1, String sj2) {
??SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
??long day = 0;
??try {
???java.util.Date date = myFormatter.parse(sj1);
???java.util.Date mydate = myFormatter.parse(sj2);
???day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
??} catch (Exception e) {
???return "";
??}
??return day + "";
?}
?/**
? * 时间前推或后推分钟,其中JJ表示分钟.
? */
?public static String getPreTime(String sj1, String jj) {
??SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??String mydate1 = "";
??try {
???Date date1 = format.parse(sj1);
???long Time = (date1.getTime() / 1000) + Integer.parseInt(jj) * 60;
???date1.setTime(Time * 1000);
???mydate1 = format.format(date1);
??} catch (Exception e) {
??}
??return mydate1;
?}
?/**
? * 得到一个时间延后或前移几天的时间,nowdate为时间,delay为前移或后延的天数
? */
?public static String getNextDay(String nowdate, String delay) {
??try {
???SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
???String mdate = "";
???Date d = strToDate(nowdate);
???long myTime = (d.getTime() / 1000) + Integer.parseInt(delay) * 24
?????* 60 * 60;
???d.setTime(myTime * 1000);
???mdate = format.format(d);
???return mdate;
??} catch (Exception e) {
???return "";
??}
?}
?/**
? * 判断是否润年
? *
? * @param ddate
? * @return
? */
?public static boolean isLeapYear(String ddate) {
??/**
?? * 详细设计： 1.被400整除是闰年，否则： 2.不能被4整除则不是闰年 3.能被4整除同时不能被100整除则是闰年
?? * 3.能被4整除同时能被100整除则不是闰年
?? */
??Date d = strToDate(ddate);
??GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
??gc.setTime(d);
??int year = gc.get(Calendar.YEAR);
??if ((year % 400) == 0)
???return true;
??else if ((year % 4) == 0) {
???if ((year % 100) == 0)
????return false;
???else
????return true;
??} else
???return false;
?}
?/**
? * 返回美国时间格式 26 Apr 2006
? *
? * @param str
? * @return
? */
?public static String getEDate(String str) {
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
??ParsePosition pos = new ParsePosition(0);
??Date strtodate = formatter.parse(str, pos);
??String j = strtodate.toString();
??String[] k = j.split(" ");
??return k[2] + k[1].toUpperCase() + k[5].substring(2, 4);
?}
?/**
? * 获取一个月的最后一天
? *
? * @param dat
? * @return
? */
?public static String getEndDateOfMonth(String dat) {// yyyy-MM-dd
??String str = dat.substring(0, 8);
??String month = dat.substring(5, 7);
??int mon = Integer.parseInt(month);
??if (mon == 1 || mon == 3 || mon == 5 || mon == 7 || mon == 8
????|| mon == 10 || mon == 12) {
???str += "31";
??} else if (mon == 4 || mon == 6 || mon == 9 || mon == 11) {
???str += "30";
??} else {
???if (isLeapYear(dat)) {
????str += "29";
???} else {
????str += "28";
???}
??}
??return str;
?}
?/**
? * 判断二个时间是否在同一个周
? *
? * @param date1
? * @param date2
? * @return
? */
?public static boolean isSameWeekDates(Date date1, Date date2) {
??Calendar cal1 = Calendar.getInstance();
??Calendar cal2 = Calendar.getInstance();
??cal1.setTime(date1);
??cal2.setTime(date2);
??int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR);
??if (0 == subYear) {
???if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2
?????.get(Calendar.WEEK_OF_YEAR))
????return true;
??} else if (1 == subYear && 11 == cal2.get(Calendar.MONTH)) {
???// 如果12月的最后一周横跨来年第一周的话则最后一周即算做来年的第一周
???if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2
?????.get(Calendar.WEEK_OF_YEAR))
????return true;
??} else if (-1 == subYear && 11 == cal1.get(Calendar.MONTH)) {
???if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2
?????.get(Calendar.WEEK_OF_YEAR))
????return true;
??}
??return false;
?}
?/**
? * 产生周序列,即得到当前时间所在的年度是第几周
? *
? * @return
? */
?public static String getSeqWeek() {
??Calendar c = Calendar.getInstance(Locale.CHINA);
??String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));
??if (week.length() == 1)
???week = "0" + week;
??String year = Integer.toString(c.get(Calendar.YEAR));
??return year + week;
?}
?/**
? * 获得一个日期所在的周的星期几的日期，如要找出2002年2月3日所在周的星期一是几号
? *
? * @param sdate
? * @param num
? * @return
? */
?public static String getWeek(String sdate, String num) {
??// 再转换为时间
??Date dd = strToDate(sdate);
??Calendar c = Calendar.getInstance();
??c.setTime(dd);
??if (num.equals("1")) // 返回星期一所在的日期
???c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
??else if (num.equals("2")) // 返回星期二所在的日期
???c.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY);
??else if (num.equals("3")) // 返回星期三所在的日期
???c.set(Calendar.DAY_OF_WEEK, Calendar.WEDNESDAY);
??else if (num.equals("4")) // 返回星期四所在的日期
???c.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY);
??else if (num.equals("5")) // 返回星期五所在的日期
???c.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
??else if (num.equals("6")) // 返回星期六所在的日期
???c.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
??else if (num.equals("0")) // 返回星期日所在的日期
???c.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
??return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime());
?}
?/**
? * 根据一个日期，返回是星期几的字符串
? *
? * @param sdate
? * @return
? */
?public static String getWeek(String sdate) {
??// 再转换为时间
??Date date = strToDate(sdate);
??Calendar c = Calendar.getInstance();
??c.setTime(date);
??// int hour=c.get(Calendar.DAY_OF_WEEK);
??// hour中存的就是星期几了，其范围 1~7
??// 1=星期日 7=星期六，其他类推
??return new SimpleDateFormat("EEEE").format(c.getTime());
?}
?public static String getWeekStr(String sdate) {
??String str = "";
??str = getWeek(sdate);
??if ("1".equals(str)) {
???str = "星期日";
??} else if ("2".equals(str)) {
???str = "星期一";
??} else if ("3".equals(str)) {
???str = "星期二";
??} else if ("4".equals(str)) {
???str = "星期三";
??} else if ("5".equals(str)) {
???str = "星期四";
??} else if ("6".equals(str)) {
???str = "星期五";
??} else if ("7".equals(str)) {
???str = "星期六";
??}
??return str;
?}
?/**
? * 两个时间之间的天数
? *
? * @param date1
? * @param date2
? * @return
? */
?public static long getDays(String date1, String date2) {
??if (date1 == null || date1.equals(""))
???return 0;
??if (date2 == null || date2.equals(""))
???return 0;
??// 转换为标准时间
??SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
??java.util.Date date = null;
??java.util.Date mydate = null;
??try {
???date = myFormatter.parse(date1);
???mydate = myFormatter.parse(date2);
??} catch (Exception e) {
??}
??long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
??return day;
?}
?/**
? * 形成如下的日历 ， 根据传入的一个时间返回一个结构 星期日 星期一 星期二 星期三 星期四 星期五 星期六 下面是当月的各个时间
? * 此函数返回该日历第一行星期日所在的日期
? *
? * @param sdate
? * @return
? */
?public static String getNowMonth(String sdate) {
??// 取该时间所在月的一号
??sdate = sdate.substring(0, 8) + "01";
??// 得到这个月的1号是星期几
??Date date = strToDate(sdate);
??Calendar c = Calendar.getInstance();
??c.setTime(date);
??int u = c.get(Calendar.DAY_OF_WEEK);
??String newday = getNextDay(sdate, (1 - u) + "");
??return newday;
?}
?/**
? * 取得数据库主键 生成格式为yyyymmddhhmmss+k位随机数
? *
? * @param k
? *??????????? 表示是取几位随机数，可以自己定
? */
?public static String getNo(int k) {
??return getUserDate("yyyyMMddhhmmss") + getRandom(k);
?}
?/**
? * 返回一个随机数
? *
? * @param i
? * @return
? */
?public static String getRandom(int i) {
??Random jjj = new Random();
??// int suiJiShu = jjj.nextInt(9);
??if (i == 0)
???return "";
??String jj = "";
??for (int k = 0; k < i; k++) {
???jj = jj + jjj.nextInt(9);
??}
??return jj;
?}
?/**
? * @param args
? */
?public static boolean RightDate(String date) {
??SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
??;
??if (date == null)
???return false;
??if (date.length() > 10) {
???sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
??} else {
???sdf = new SimpleDateFormat("yyyy-MM-dd");
??}
??try {
???sdf.parse(date);
??} catch (ParseException pe) {
???return false;
??}
??return true;
?}
?/***************************************************************************
? * //nd=1表示返回的值中包含年度 //yf=1表示返回的值中包含月份 //rq=1表示返回的值中包含日期 //format表示返回的格式 1
? * 以年月日中文返回 2 以横线-返回 // 3 以斜线/返回 4 以缩写不带其它符号形式返回 // 5 以点号.返回
? **************************************************************************/
?public static String getStringDateMonth(String sdate, String nd, String yf,
???String rq, String format) {
??Date currentTime = new Date();
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
??String dateString = formatter.format(currentTime);
??String s_nd = dateString.substring(0, 4); // 年份
??String s_yf = dateString.substring(5, 7); // 月份
??String s_rq = dateString.substring(8, 10); // 日期
??String sreturn = "";
??if (sdate == null || sdate.equals("") || !Isdate(sdate)) { // 处理空值情况
???if (nd.equals("1")) {
????sreturn = s_nd;
????// 处理间隔符
????if (format.equals("1"))
?????sreturn = sreturn + "年";
????else if (format.equals("2"))
?????sreturn = sreturn + "-";
????else if (format.equals("3"))
?????sreturn = sreturn + "/";
????else if (format.equals("5"))
?????sreturn = sreturn + ".";
???}
???// 处理月份
???if (yf.equals("1")) {
????sreturn = sreturn + s_yf;
????if (format.equals("1"))
?????sreturn = sreturn + "月";
????else if (format.equals("2"))
?????sreturn = sreturn + "-";
????else if (format.equals("3"))
?????sreturn = sreturn + "/";
????else if (format.equals("5"))
?????sreturn = sreturn + ".";
???}
???// 处理日期
???if (rq.equals("1")) {
????sreturn = sreturn + s_rq;
????if (format.equals("1"))
?????sreturn = sreturn + "日";
???}
??} else {
???// 不是空值，也是一个合法的日期值，则先将其转换为标准的时间格式
???// sdate = roc.util.RocDate.getOKDate(sdate);
???s_nd = sdate.substring(0, 4); // 年份
???s_yf = sdate.substring(5, 7); // 月份
???s_rq = sdate.substring(8, 10); // 日期
???if (nd.equals("1")) {
????sreturn = s_nd;
????// 处理间隔符
????if (format.equals("1"))
?????sreturn = sreturn + "年";
????else if (format.equals("2"))
?????sreturn = sreturn + "-";
????else if (format.equals("3"))
?????sreturn = sreturn + "/";
????else if (format.equals("5"))
?????sreturn = sreturn + ".";
???}
???// 处理月份
???if (yf.equals("1")) {
????sreturn = sreturn + s_yf;
????if (format.equals("1"))
?????sreturn = sreturn + "月";
????else if (format.equals("2"))
?????sreturn = sreturn + "-";
????else if (format.equals("3"))
?????sreturn = sreturn + "/";
????else if (format.equals("5"))
?????sreturn = sreturn + ".";
???}
???// 处理日期
???if (rq.equals("1")) {
????sreturn = sreturn + s_rq;
????if (format.equals("1"))
?????sreturn = sreturn + "日";
???}
??}
??return sreturn;
?}
?public static String getNextMonthDay(String sdate, int m) {
??sdate = getOKDate(sdate);
??int year = Integer.parseInt(sdate.substring(0, 4));
??int month = Integer.parseInt(sdate.substring(5, 7));
??month = month + m;
??if (month < 0) {
???month = month + 12;
???year = year - 1;
??} else if (month > 12) {
???month = month - 12;
???year = year + 1;
??}
??String smonth = "";
??if (month < 10)
???smonth = "0" + month;
??else
???smonth = "" + month;
??return year + "-" + smonth + "-10";
?}
?public static String getOKDate(String sdate) {
??if (sdate == null || sdate.equals(""))
???return getStringDateShort();
??if (!Isdate(sdate)) {
???sdate = getStringDateShort();
??}
??// 将“/”转换为“-”
??sdate = sdate.replace("/", "-");
??// 如果只有8位长度，则要进行转换
??if (sdate.length() == 8)
???sdate = sdate.substring(0, 4) + "-" + sdate.substring(4, 6) + "-"
?????+ sdate.substring(6, 8);
??SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
??ParsePosition pos = new ParsePosition(0);
??Date strtodate = formatter.parse(sdate, pos);
??String dateString = formatter.format(strtodate);
??return dateString;
?}
?public static void main(String[] args) throws Exception {
??try {
???// System.out.print(Integer.valueOf(getTwoDay("2006-11-03 12:22:10",
???// "2006-11-02 11:22:09")));
??} catch (Exception e) {
???throw new Exception();
??}
??// System.out.println("sss");
?}
