JAVA日期操作
public static final String FormatDayToChinaTime24H = "yyyy年MM月dd日";/** * 将yyyy-mm-dd转为yyyy-m-d ** @param day * 距离现在之后的天数 * @return Date:距离现在之后的若干天的日期; */public static String getYMDDays(String day){String dayTime=day; if(String.valueOf(day.charAt(8)).equals("0"))dayTime=day.substring(0,8)+day.substring(9); if(String.valueOf(day.charAt(5)).equals("0"))dayTime=dayTime.substring(0,5)+dayTime.substring(6); return dayTime; }/** * 两个日期间的天数 ** @param days * 距离现在之后的天数 * @return Date:距离现在之后的若干天的日期; */public static int getIntervalDays(Date startday,Date endday){ if(startday.after(endday)){ Date cal=startday; startday=endday; endday=cal; } long sl=startday.getTime(); long el=endday.getTime(); long ei=el-sl; return (int)(ei/(1000*60*60*24)); }/** * 取得距离现在多少天（距离现在之后的若干天） ** @param days * 距离现在之后的天数 * @return Date:距离现在之后的若干天的日期; */public static Date getDate(int days) {Date dateresult = new Date();try {DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.FULL);// Create our Gregorian Calendar.GregorianCalendar cal = new GregorianCalendar();// Set the date and time of our calendar// to the system&s date and timecal.setTime(new Date());cal.add(GregorianCalendar.DAY_OF_MONTH, days);dateresult = cal.getTime();} catch (Exception e) {System.out.println("exception" + e.toString());}return dateresult;}/** * @根据当前日期计算n天后的日期 * @return String */public static Date afterNDay(Date date, int n) {Calendar c = Calendar.getInstance();DateFormat df = new SimpleDateFormat("yyyy-MM-dd");c.setTime(date);c.add(Calendar.DATE, n);Date d2 = c.getTime();// String s=df.format(d2);return d2;}/** * @根据当前日期计算n天后的日期 * @return String */public static String afterDay(Date date, int n) {Calendar c = Calendar.getInstance();DateFormat df = new SimpleDateFormat("yyyy-MM-dd");// String s=df.format(d2);return df.toString();}/** * @获取当前时间是星期几，“星期日” * @return String */public static String getDayInWeek() {Date today = new Date(System.currentTimeMillis());SimpleDateFormat simpleDateFormat = new SimpleDateFormat("E");return simpleDateFormat.format(today);}/** ** @跟具字符串时间来获得星期几，(SimpleDateFormat("yyyy-MM-dd")) * @return */public static String getDayInWeek(String mydatestring) { SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); Date date = null; String showDate =""; try { date = dateFormat.parse(mydatestring); } catch (ParseException e) { } Calendar cd = Calendar.getInstance(); cd.setTime(date); int mydate = cd.get(Calendar.DAY_OF_WEEK); switch (mydate) { case 1: showDate = "星期日"; break; case 2: showDate = "星期一"; break; case 3: showDate = "星期二"; break; case 4: showDate = "星期三"; break; case 5: showDate = "星期四"; break; case 6: showDate = "星期五"; break; default: showDate = "星期六"; break; } return showDate;}/** * @根据日期时间，获取当前时间是星期几，“星期日” * @return String */public static String getDayInWeek(Date date) {if (date == null)return "";SimpleDateFormat simpleDateFormat = new SimpleDateFormat("E");return simpleDateFormat.format(date);}/** * @获取当前时间在这个月的天 * @return String */public static String getDayInMonth() {Date today = new Date(System.currentTimeMillis());SimpleDateFormat simpleDateFormat = new SimpleDateFormat("d");return simpleDateFormat.format(today);}/** * @根据日期，获取当前时间在这个月的天 * @return String */public static String getDayInMonth(Date date) {if (date == null)return "";SimpleDateFormat simpleDateFormat = new SimpleDateFormat("d");return simpleDateFormat.format(date);}/** * @根据在本年当中，获取月份格式"M" * @return String */public static String getMonthInYear() {Date today = new Date(System.currentTimeMillis());SimpleDateFormat simpleDateFormat = new SimpleDateFormat("M");return simpleDateFormat.format(today);}/** * @根据在本年当中，获取月份格式"MM" * @return String */public static String getMonthInYear2() {java.util.Date today = new Date(System.currentTimeMillis());SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MM");return simpleDateFormat.format(today);}/** * @根据日期，获取月份格式"MM" * @return String */public static String getMonthInYear2(String formatDate) {java.util.Date day = getDate(formatDate, "yyyy-MM-dd");SimpleDateFormat simpleDateFormat = new SimpleDateFormat("MM");return simpleDateFormat.format(day);}/** * @获取当前时间的年，格式"yyyy" * @return String */public static String getYear() {java.util.Date today = new java.util.Date(System.currentTimeMillis());SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy");return simpleDateFormat.format(today);}/** * @根据时间，获取年，格式"yyyy" * @return String */public static String getYear(String formatDate) {java.util.Date day = getDate(formatDate, "yyyy-MM-dd");SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy");return simpleDateFormat.format(day);}/** * @根据日期以及日期格式，获取日期字符串表达 * @return String */public static String getFormatDate(java.util.Date thisDate, String format) {if (thisDate == null)return "";SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);return simpleDateFormat.format(thisDate);}/** * @根据日期以及日期格式，获取日期 * @return String */public static java.util.Date getDate(String date, String format) {SimpleDateFormat simpleDateFormat = new SimpleDateFormat(format);try {return simpleDateFormat.parse(date);} catch (ParseException ex) {return null;}}/** * @返回系统当前月的第一天所表示的日期 * @param monthDate * Date * @return Date */public static java.util.Date getFirstDateMonth() {try {String date_s = getYear() + "-" + getMonthInYear2() + "-01";return getDate(date_s, "yyyy-MM-dd");} catch (Exception er) {er.printStackTrace();}return null;}/** * @返回系统当前月的第一天所表示的日期 * @param monthDate * Date * @return Date */public static java.util.Date getFirstDateMonth(String formatDate) {try {String date_s = getYear(formatDate) + "-"+ getMonthInYear2(formatDate) + "-01";return getDate(date_s, "yyyy-MM-dd");} catch (Exception er) {er.printStackTrace();}return null;}/** * @返回系统当前月的第一天所表示的日期 * @param monthDate * Date * @return Date */public static String getFirstDateMonthToString() {try {return getYear() + "-" + getMonthInYear2() + "-01";} catch (Exception er) {er.printStackTrace();}return null;}/** * @返回系统当前月的第一天所表示的日期 * @param monthDate * Date * @return Date */public static String getFirstDateMonthToString(String formatDate) {try {return getYear(formatDate) + "-" + getMonthInYear2(formatDate)+ "-01";} catch (Exception er) {er.printStackTrace();}return null;}/** * @返回系统当前月的最后一天所表示的日期 * @return Date */public static java.util.Date getLastDateMonth() {try {int lastday = getDaySumInTheMonth();String date_s;if (lastday < 10)date_s = getYear() + "-" + getMonthInYear2() + "-0" + lastday;elsedate_s = getYear() + "-" + getMonthInYear2() + "-" + lastday;return getDate(date_s, "yyyy-MM-d");} catch (Exception er) {er.printStackTrace();}return null;}/** * @返回系统当前月的最后一天所表示的日期 * @return Date */public static String getLastDateMonthToString(String formatDate) {try {int lastday = getDaySumInTheMonth(formatDate);if (lastday < 10)return getYear(formatDate) + "-" + getMonthInYear2(formatDate)+ "-0" + lastday;elsereturn getYear(formatDate) + "-" + getMonthInYear2(formatDate)+ "-" + lastday;} catch (Exception er) {er.printStackTrace();}return null;}/** * @根据时间，返回最后一天所表示的日期 * @param formatDate * String * @return Date */public static java.util.Date getLastDateMonth(String formatDate) {try {int lastday = getDaySumInTheMonth(formatDate);String month = getMonthInYear2(formatDate);String year = getYear(formatDate);String date_s;if (lastday < 10)date_s = year + "-" + month + "-0" + lastday;elsedate_s = year + "-" + month + "-" + lastday;System.out.println(date_s);return getDate(date_s, "yyyy-MM-d");} catch (Exception er) {er.printStackTrace();}return null;}/** * @获得这个月的天数 * @return int */public static int getDaySumInTheMonth() {String month = DayFormat.getMonthInYear();if (month.equalsIgnoreCase("12"))return 31;int mon = Integer.parseInt(month);java.util.Date date = DayFormat.getDate(DayFormat.getYear() + "-"+ (mon + 1) + "-" + "1", "yyyy-MM-d");Calendar cal = Calendar.getInstance();cal.setTime(date);cal.add(Calendar.DATE, -1);return Integer.parseInt(new SimpleDateFormat("dd").format(cal.getTime()));}/** * @获得所在日期月份的天数 * @return int */public static int getDaySumInTheMonth(java.util.Date date) {String month = new SimpleDateFormat("MM").format(date);if (month.equalsIgnoreCase("12"))return 31;int mon = Integer.parseInt(month);java.util.Date date2 = DayFormat.getDate(new SimpleDateFormat("yyyy").format(date)+ "-" + (mon + 1) + "-" + "1", "yyyy-MM-d");Calendar cal = Calendar.getInstance();cal.setTime(date2);cal.add(Calendar.DATE, -1);return Integer.parseInt(new SimpleDateFormat("dd").format(cal.getTime()));}/** * @获得所在日期月份的天数 * @return int */public static int getDaySumInTheMonth(String formatDate) {String month = DayFormat.getMonthInYear2(formatDate);if (month.equalsIgnoreCase("12"))return 31;int mon = Integer.parseInt(month);java.util.Date date = DayFormat.getDate(DayFormat.getYear(formatDate)+ "-" + (mon + 1) + "-" + "1", "yyyy-MM-d");Calendar cal = Calendar.getInstance();cal.setTime(date);cal.add(Calendar.DATE, -1);return Integer.parseInt(new SimpleDateFormat("dd").format(cal.getTime()));}/** * @把日期格式转换成字符串格式,格式为'yyyy-MM-dd' * @param date * Date * @return String */public static String getFormatDate(java.util.Date date) {SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");return simpleDateFormat.format(date);}public final static String FormatDay1 = "yyyy-MM-dd";public final static String FormatDay2 = "yyyy年MM月dd日";public final static String FormatDay3 = "yyyy年MM月dd日 HH:mm:ss";public final static String FormatDay4 = "yyyy-MM-dd HH:mm";public static final String Format24Datetime1 = "yyyy-MM-dd HH:mm:ss";// 24public static final String Format12Datetime1 = "yyyy-MM-dd hh:mm:ss";// 12/** * 获取当前时间 ** @return */public static String getToday() {return getToday(FormatDay1);}public static java.sql.Timestamp getCurrentTimestamp() {return new Timestamp(System.currentTimeMillis());}public static java.util.Date getCurrentUtilDate() {return new java.util.Date(System.currentTimeMillis());}public static String getToday(String formatDay) {java.util.Date today = new java.util.Date();SimpleDateFormat df = new SimpleDateFormat(formatDay);return df.format(today).toString();}public static String get24DateTime() {return get24DateTime(Format24Datetime1);}public static String get24DateTime(String format24DateTime) {java.util.Date today = new java.util.Date();SimpleDateFormat df = new SimpleDateFormat(format24DateTime);return df.format(today).toString();}public static String get12DateTime() {return get12DateTime(Format12Datetime1);}public static String get12DateTime(String format12DateTime) {java.util.Date today = new java.util.Date();SimpleDateFormat df = new SimpleDateFormat(format12DateTime);return df.format(today).toString();}public static String get24DateTime(Timestamp timestamp) {SimpleDateFormat df = new SimpleDateFormat(Format24Datetime1);return df.format(timestamp).toString();}public static String get12DateTime(Timestamp timestamp) {SimpleDateFormat df = new SimpleDateFormat(Format12Datetime1);return df.format(timestamp).toString();}// STRING到日期public static java.sql.Date stringToDate(String dateStr) {return java.sql.Date.valueOf(dateStr);}public static java.sql.Timestamp stringToTimestamp(String timestampStr) {if (timestampStr == null || timestampStr.length() < 1)return null;return java.sql.Timestamp.valueOf(timestampStr);}public static java.sql.Timestamp stringToTimestamp2(String dateStr) {if (dateStr == null || dateStr.length() < 1)return null;return java.sql.Timestamp.valueOf(dateStr + " 00:00:00.000000000");}public static java.sql.Timestamp stringToTimestamp3(String dateStr) {if (dateStr == null || dateStr.length() < 1)return null;return java.sql.Timestamp.valueOf(dateStr + ":00.000000000");}public static java.sql.Time stringToTime(String timeStr) {return java.sql.Time.valueOf(timeStr);}// 日期到STRINGpublic static String dateToString(java.sql.Date datee) {return datee.toString();}public static String timestampToString(java.sql.Timestamp timestampe) {return timestampe.toString();}public static String timestampToStringForFormat(Timestamp timestamp,String format) {if (timestamp == null)return "";SimpleDateFormat df = new SimpleDateFormat(format);return df.format(timestamp).toString();}public static String getTimestampToDateTime15Len(java.sql.Timestamp timestampe) {if (timestampe == null || timestampe.toString().length() < 1)return "";return timestampe.toString().substring(0, 16);}public static String timeToString(java.sql.Time timee) {return timee.toString();}public static java.sql.Timestamp StringToTimestamp(String dateString)throws ParseException {java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat(FormatDay1);formatter.setLenient(false);return new java.sql.Timestamp((formatter.parse(dateString).getTime()));}public static java.sql.Timestamp StringToTimestampAll(String dateString)throws ParseException {return java.sql.Timestamp.valueOf(dateString);}//获得周日的日期 public static String getSunday(Date date){ Calendar c = Calendar.getInstance(); c.setTime(date); c.set(Calendar.DAY_OF_WEEK,Calendar.SUNDAY); return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime()); } //获得周一的日期 public static String getMonday(Date date){ Calendar c = Calendar.getInstance(); c.setTime(date); c.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY); return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime()); } //获得周二的日期 public static String getTuesday(Date date){ Calendar c = Calendar.getInstance(); c.setTime(date); c.set(Calendar.DAY_OF_WEEK,Calendar.TUESDAY); return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime()); } //获得周三的日期 public static String getWednesday(Date date){ Calendar c = Calendar.getInstance(); c.setTime(date); c.set(Calendar.DAY_OF_WEEK,Calendar.WEDNESDAY); return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime()); } //获得周四的日期 public static String getThursday(Date date){ Calendar c = Calendar.getInstance(); c.setTime(date); c.set(Calendar.DAY_OF_WEEK,Calendar.THURSDAY); return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime()); } //获得周五的日期 public static String getFriday(Date date){ Calendar c = Calendar.getInstance(); c.setTime(date); c.set(Calendar.DAY_OF_WEEK,Calendar.FRIDAY); return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime()); } //获得周六的日期 public static String getSaturday(Date date){ Calendar c = Calendar.getInstance(); c.setTime(date); c.set(Calendar.DAY_OF_WEEK,Calendar.SATURDAY); return new SimpleDateFormat("yyyy-MM-dd").format(c.getTime()); }public static void main(String args[]) {try {String d = "2007-05-15 19:23:48.703";System.out.println(d);java.sql.Timestamp timestampe = java.sql.Timestamp.valueOf(d);System.out.println(timestampe.toString());} catch (Exception er) {er.printStackTrace();}}
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