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 + "";elsereturn "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;elsereturn true;} elsereturn 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-ddString 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;elsesmonth = "" + 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");}