本文章主要用于Java实现时间的各种格式的输入要求
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.*;/*** <p>* <p>Title:DateUtil.java</p >* <p>Description: 用于时间格式化的工具类</p >* <p>Date:2020/5/27 11:15</p >** @version 1.0*/
public class DateUtil {public static String datePattern = "yyyy-MM-dd";public static String timePattern = "yyyy-MM-dd HH:mm";public static String dateMoth = "yyyy-MM";public static String timePattern2 = "yyyy-MM-dd HH:mm:ss";public static String timeForAlarm = "yyyy.MM.dd HH:mm:ss";public static String timePattern3 = "yyyy年MM月dd日HH时";public static String timePattern4 = "yyyy年MM月dd日HH时mm分";public static String timePattern5 = "yyyyMMddHHmmss";public static String timePattern6 = "yyyy年MM月dd日";///public static final long SECOND_IN_MILLIS = 1000;public static final long MINITE_IN_MILLIS = SECOND_IN_MILLIS * 60;public static final long HOUR_IN_MILLIS = MINITE_IN_MILLIS * 60;public static final long DAY_IN_MILLIS = HOUR_IN_MILLIS * 24;public static final long WEEK_IN_MILLIS = DAY_IN_MILLIS * 7;public static final String STD_DATE_PATTERN = "yyyy-MM-dd";public static final String STD_TIME_PATTERN = "HH:mm:ss";public static final String STD_DATETIME_PATTERN = "yyyy-MM-dd HH:mm:ss";public static final String RFC822_DATETIME_PATTERN = "EEE, dd MMM yyyy HH:mm:ss 'GMT'";public static final String W3C_DATETIME_PATTERN = "yyyy-MM-dd'T'HH:mm:ss'Z'";//@formatter:offprivate static final String[] RFC822_PATTENRS = {"EEE, dd MMM yy HH:mm:ss z","EEE, dd MMM yy HH:mm z","dd MMM yy HH:mm:ss z","dd MMM yy HH:mm z",};private static final String[] W3CDATETIME_PATTERNS = {"yyyy-MM-dd'T'HH:mm:ss.SSSz","yyyy-MM-dd't'HH:mm:ss.SSSz","yyyy-MM-dd'T'HH:mm:ss.SSS'Z'","yyyy-MM-dd't'HH:mm:ss.SSS'z'","yyyy-MM-dd'T'HH:mm:ssz","yyyy-MM-dd't'HH:mm:ssz","yyyy-MM-dd'T'HH:mm:ss'Z'","yyyy-MM-dd't'HH:mm:ss'z'","yyyy-MM-dd'T'HH:mmz","yyyy-MM'T'HH:mmz","yyyy'T'HH:mmz","yyyy-MM-dd't'HH:mmz","yyyy-MM-dd'T'HH:mm'Z'","yyyy-MM-dd't'HH:mm'z'","yyyy-MM-dd","yyyy-MM","yyyy",};private static final String[] STD_PATTERNS = {"yyyy-MM-dd HH:mm:ss,SSS","yyyy-MM-dd HH:mm:ss.SSS","yyyy-MM-dd HH:mm:ss","yyyy-MM-dd HH:mm","yyyy-MM-dd","yyyy/MM/dd HH:mm:ss,SSS","yyyy/MM/dd HH:mm:ss.SSS","yyyy/MM/dd HH:mm:ss","yyyy/MM/dd HH:mm","yyyy/MM/dd","yyyyMMddHHmmss","yyyyMMdd","hh:mm:ss,SSS","hh:mm:ss.SSS","hh:mm:ss",};//@formatter:on/*** Return default date format (yyyy/MM/dd)** @return the date format will be show*/public static String getDatePattern() {return DateUtil.datePattern;}/***** @param aDate* @return*/public static final String getDate(Date aDate) {SimpleDateFormat df = null;String returnValue = "";if (aDate != null) {df = new SimpleDateFormat(DateUtil.datePattern);returnValue = df.format(aDate);}return (returnValue);}/***** @param aMask* @param strDate* @return Date* @see java.text.SimpleDateFormat* @throws ParseException*/public static final Date convertStringToDate(String aMask, String strDate) throws ParseException {SimpleDateFormat df = null;Date date = null;df = new SimpleDateFormat(aMask);try {date = df.parse(strDate);} catch (ParseException pe) {// log.error("ParseException: " + pe);throw new ParseException(pe.getMessage(), pe.getErrorOffset());}return (date);}/*** This method returns the current date time in the format:* yyyy/MM/dd HH:MM a** @param theTime* the current time* @return the current date/time*/public static String getTimeNow(Date theTime) {return DateUtil.getDateTime(DateUtil.timePattern, theTime);}public static Date getDateNow(Date theTime) {Date date = null;try {date = DateUtil.convertStringToDate(DateUtil.getDateTime(DateUtil.datePattern, theTime));} catch (ParseException e) {e.printStackTrace();}return date;}/*** This method returns the current date in the format: yyyy/MM/dd** @return the current date* @throws ParseException*/public static Calendar getToday() throws ParseException {Date today = new Date();SimpleDateFormat df = new SimpleDateFormat(DateUtil.datePattern);// This seems like quite a hack (date -> string -> date),// but it works ;-)String todayAsString = df.format(today);Calendar cal = new GregorianCalendar();cal.setTime(DateUtil.convertStringToDate(todayAsString));return cal;}/*** This method generates a string representation of a date's date/time* in the format you specify on input** @param aMask* the date pattern the string is in* @param aDate* a date object* @return a formatted string representation of the date** @see java.text.SimpleDateFormat*/public static final String getDateTime(String aMask, Date aDate) {SimpleDateFormat df = null;String returnValue = "";if (aDate == null) {// log.error("aDate is null!");} else {df = new SimpleDateFormat(aMask);returnValue = df.format(aDate);}return (returnValue);}/*** This method generates a string representation of a current datetimestamp* in the format you specify on input** @param* @param* @return a formatted string representation of the now** @see java.text.SimpleDateFormat* by woo 2009-06-11*/public static final String getDateTimeStamp() {String returnValue = "";Calendar calCurrent = Calendar.getInstance();int intDay = calCurrent.get(Calendar.DATE);int intMonth = calCurrent.get(Calendar.MONTH) + 1;int intYear = calCurrent.get(Calendar.YEAR);// int intHour=calCurrent.get(Calendar.HOUR);int intHour = calCurrent.get(Calendar.HOUR_OF_DAY);int intMin = calCurrent.get(Calendar.MINUTE);int intSec = calCurrent.get(Calendar.SECOND);if (intDay == 0) {// log.error("aDate is null!");} else {// df = new SimpleDateFormat(aMask);returnValue = String.format("%1$04d", intYear) + String.format("%1$02d", intMonth) +String.format("%1$02d", intDay) + String.format("%1$02d", intHour) +String.format("%1$02d", intMin) + String.format("%1$02d", intSec);}return (returnValue);}/***** @param aDate* @return*/public static final String convertDateToString(Date aDate) {return DateUtil.getDateTime(DateUtil.datePattern, aDate);}/***** @param aDate* @return*/public static final String convertDateToStringForAlarm(Date aDate) {return DateUtil.getDateTime(DateUtil.timeForAlarm, aDate);}/***** @param aDate* @return*/public static final String convertTimeToString(Date aDate) {return DateUtil.getDateTime(DateUtil.timePattern2, aDate);}public static final String convertTimeToStringForYu(Date aDate) {return DateUtil.getDateTime(DateUtil.timePattern3, aDate);}public static final String convertTimeToStringMin(Date aDate) {return DateUtil.getDateTime(DateUtil.timePattern4, aDate);}public static final String convertTimeToStringDay(Date aDate) {return DateUtil.getDateTime(DateUtil.timePattern6, aDate);}/***** @param strDate* (format yyyy/MM/dd)* @return** @throws ParseException*/public static Date convertStringToDateMoth(String strDate) throws ParseException {Date aDate = null;try {aDate = DateUtil.convertStringToDate(DateUtil.dateMoth, strDate);} catch (ParseException pe) {pe.printStackTrace();throw new ParseException(pe.getMessage(), pe.getErrorOffset());}return aDate;}/***** @param strDate* (format yyyy/MM/dd)* @return** @throws ParseException*/public static Date convertStringToDate(String strDate) throws ParseException {Date aDate = null;try {aDate = DateUtil.convertStringToDate(DateUtil.datePattern, strDate);} catch (ParseException pe) {pe.printStackTrace();throw new ParseException(pe.getMessage(), pe.getErrorOffset());}return aDate;}public static Date convertStringToDateTime(String strDate) throws ParseException {Date aDate = null;try {aDate = DateUtil.convertStringToDate(DateUtil.timePattern, strDate);} catch (ParseException pe) {pe.printStackTrace();throw new ParseException(pe.getMessage(), pe.getErrorOffset());}return aDate;}public static String weekday(String date) {Calendar calendar = Calendar.getInstance();DateFormat dateFormat = DateFormat.getDateInstance();Date da = null;try {da = dateFormat.parse(date);} catch (ParseException e) {e.printStackTrace();}calendar.setTime(da);int num = calendar.get(Calendar.DAY_OF_WEEK);if (num == 1) {num = 7;} else {num = num - 1;}return num + "";}public static boolean isMorning() {boolean isMorning = false;Calendar cal = new GregorianCalendar();int hour = cal.get(Calendar.HOUR_OF_DAY);if ((hour >= 6) && (hour < 18)) {isMorning = true;}return isMorning;}public static boolean isMonthEnd() {boolean yes = false;Calendar cal = new GregorianCalendar();if (cal.get(Calendar.DATE) == cal.getActualMaximum(Calendar.DATE)) {yes = true;}return yes;}public static boolean isBeforeToday(Date date) {Date today = new Date();return date.before(today);}public static Date getTodayEnd() throws ParseException {Date today = new Date();SimpleDateFormat df = new SimpleDateFormat(DateUtil.datePattern);String todayAsString = df.format(today);todayAsString += " 23:59:59";return DateUtil.convertStringToDate("yyyy-MM-dd HH:mm:ss", todayAsString);}public static Date DateBefAft(int days, String format) {//if ((format == null) || "".equals(format)) {format = "yyyy-MM-dd";}Calendar now = Calendar.getInstance();SimpleDateFormat formatter = new SimpleDateFormat(format);now.add(Calendar.DAY_OF_YEAR, -days);Date d = null;try {d = DateUtil.convertStringToDate(formatter.format(now.getTime()));} catch (ParseException e) {e.printStackTrace();}return d;}/*** 字符串转换为日期型** @param dateString* @return*/public static Date stringToDate(String dateString) {if ((dateString == null) || "".equals(dateString)) {return null;}SimpleDateFormat df = new SimpleDateFormat(DateUtil.timePattern);return df.parse(dateString, new ParsePosition(0));}public static final String getYear() {String returnValue = "";Calendar calCurrent = Calendar.getInstance();int intYear = calCurrent.get(Calendar.YEAR);returnValue = String.valueOf(intYear);return returnValue;}public static final String getMonth() {String returnValue = "";Calendar calCurrent = Calendar.getInstance();int intMonth = calCurrent.get(Calendar.MONTH);returnValue = String.valueOf(intMonth);return returnValue;}/*** 获得当天之后的N天日期** @return*/public static List<String> getNextDays(int num) {List<String> list = new ArrayList<String>();SimpleDateFormat sdf = new SimpleDateFormat(DateUtil.datePattern);for (int i = 1; i < num; i++) {list.add(sdf.format(DateUtil.getAfterDate(i)));}return list;}/*** 获得当天之前的N天日期** @return*/public static List<String> getBeforeDays(int num) {List<String> list = new ArrayList<String>();SimpleDateFormat sdf = new SimpleDateFormat(DateUtil.datePattern);for (int i = 1; i < num; i++) {list.add(sdf.format(DateUtil.getBeforeDate(i)));}return list;}/*** 获取当前日期n天后的日期** @param n* :返回当天后的第N天* @return 返回的日期*/public static Date getAfterDate(int n) {Calendar c = Calendar.getInstance();c.add(Calendar.DAY_OF_MONTH, n);return c.getTime();}/*** 获取当前日期n天钱的日期** @param n* :返回当天后的第N天* @return 返回的日期*/public static Date getBeforeDate(int n) {Calendar c = Calendar.getInstance();c.add(Calendar.DAY_OF_MONTH, -n);return c.getTime();}/*** 计算两个日期相差几天** @param startDate* @param endDate* @return 天数* @throws ParseException*/public static long getBeforeDate(String startDate, String endDate) throws ParseException {SimpleDateFormat sdf = new SimpleDateFormat(DateUtil.datePattern);Date d1 = sdf.parse(startDate);Date d2 = sdf.parse(endDate);long daysBetween = ((d2.getTime() - d1.getTime()) + 1000000) / (3600 * 24 * 1000);return daysBetween;}/*** 获得当前月份的第一天和最后一天。** 数组中第一个存的是第一天，第二个存的是最后一天** @return*/public static String[] getMonthStartEnd(Calendar today) {String[] dateStr = new String[2];int month = today.get(Calendar.MONTH) + 1;SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");if ((month == 1) || (month == 3) || (month == 5) || (month == 7) || (month == 8) || (month == 10) ||(month == 12)) {today.set(Calendar.DAY_OF_MONTH, 1);dateStr[0] = format.format(today.getTime()) + " 00:00:00";Calendar lastDay = DateUtil.getJumpDateSimple(today, 30, true);dateStr[1] = format.format(lastDay.getTime()) + " 00:00:00";return dateStr;} else if (month == 2) {today.set(Calendar.DAY_OF_MONTH, 1);dateStr[0] = format.format(today.getTime()) + " 00:00:00";if (DateUtil.isProYear(today.get(Calendar.YEAR))) {Calendar lastDay = DateUtil.getJumpDateSimple(today, 28, true);dateStr[1] = format.format(lastDay.getTime()) + " 00:00:00";} else {Calendar lastDay = DateUtil.getJumpDateSimple(today, 27, true);dateStr[1] = format.format(lastDay.getTime()) + " 00:00:00";}return dateStr;} else {today.set(Calendar.DAY_OF_MONTH, 1);dateStr[0] = format.format(today.getTime()) + " 00:00:00";Calendar lastDay = DateUtil.getJumpDateSimple(today, 29, true);dateStr[1] = format.format(lastDay.getTime()) + " 00:00:00";return dateStr;}}/*** 获得特定日期多少天前（后）的日前** @param oldD* [Calendar] 特定日期* @param days* [int] 天数* @param b* [boolean][false前][true后] notice: days<=365**/public static java.util.Calendar getJumpDateSimple(java.util.Calendar oldD, int days, boolean b) {if (days > 365) {return null;}// int nowYear = oldD.getYear();int nowYear = oldD.get(Calendar.YEAR);// Calendar ca = Calendar.getInstance();// ca.setTime(oldD);Calendar ca = oldD;int nowDay = ca.get(Calendar.DAY_OF_YEAR);int newYear = 0;int newDay = 0;if (b) { // 向后加newDay = nowDay + days;newYear = nowYear;if (DateUtil.isProYear(nowYear)) {if (newDay > 366) {newDay = newDay - 366;newYear = nowYear + 1;}} else {if (newDay > 365) {newDay = newDay - 365;newYear = nowYear + 1;}}} else { // 向前减newDay = nowDay - days;newYear = nowYear;if (DateUtil.isProYear(nowYear)) {if (newDay < 0) {newDay = newDay + 366;newYear = nowYear - 1;}} else {if (newDay < 0) {newDay = newDay + 365;newYear = nowYear - 1;}}}java.util.Calendar newDate = DateUtil.getDateByday(newYear, newDay);return newDate;}/*** 判别是否是润年** @param year* [int] 输入的年份* @return boolean [ture润年][false非润年]*/public static boolean isProYear(int year) {boolean isproyear = false;if (((year % 400) == 0) | (((year % 100) != 0) && ((year % 4) == 0))) {isproyear = true;} else {isproyear = false;}return isproyear;}/*** 根据特定年中的第多少天，获得新日期** @param year* [int] 输入特定年份* @param day* [int] 输入的第多少天* @return Calendar* @author : 胡长城 Date: 2002-01-14*/public static java.util.Calendar getDateByday(int year, int day) {if (day > 366) {return null;}boolean isproyear = DateUtil.isProYear(year);int dayofmonth = 0;int i = day;int month = 0;if (isproyear) {// 润年情况if (i <= 31) {dayofmonth = day;month = 1;} else if ((i > 31) && (i <= 60)) {dayofmonth = day - 31;month = 2;} else if ((i > 60) && (i <= 91)) {dayofmonth = day - 60;month = 3;} else if ((i > 91) && (i <= 121)) {dayofmonth = day - 91;month = 4;} else if ((i > 121) && (i <= 152)) {dayofmonth = day - 121;month = 5;} else if ((i > 152) && (i <= 182)) {dayofmonth = day - 152;month = 6;} else if ((i > 182) && (i <= 213)) {dayofmonth = day - 182;month = 7;} else if ((i > 213) && (i <= 244)) {dayofmonth = day - 213;month = 8;} else if ((i > 244) && (i <= 274)) {dayofmonth = day - 244;month = 9;} else if ((i > 274) && (i <= 305)) {dayofmonth = day - 274;month = 10;} else if ((i > 305) && (i <= 335)) {dayofmonth = day - 305;month = 11;} else if ((i > 335) && (i <= 366)) {dayofmonth = day - 335;month = 12;}} else {// 非润年情况if (i <= 31) {dayofmonth = day;month = 1;} else if ((i > 31) && (i <= 59)) {dayofmonth = day - 31;month = 2;} else if ((i > 59) && (i <= 90)) {dayofmonth = day - 59;month = 3;} else if ((i > 90) && (i <= 120)) {dayofmonth = day - 90;month = 4;} else if ((i > 120) && (i <= 151)) {dayofmonth = day - 120;month = 5;} else if ((i > 151) && (i <= 181)) {dayofmonth = day - 151;month = 6;} else if ((i > 181) && (i <= 212)) {dayofmonth = day - 181;month = 7;} else if ((i > 212) && (i <= 243)) {dayofmonth = day - 212;month = 8;} else if ((i > 243) && (i <= 273)) {dayofmonth = day - 243;month = 9;} else if ((i > 273) && (i <= 304)) {dayofmonth = day - 273;month = 10;} else if ((i > 304) && (i <= 334)) {dayofmonth = day - 304;month = 11;} else if ((i > 334) && (i <= 365)) {dayofmonth = day - 334;month = 12;}}java.util.Calendar ca = java.util.Calendar.getInstance();// 设定时间从当前的0时0分1秒开始// 所有的月份均是0 based:0-11ca.set(year, month - 1, dayofmonth, 0, 0, 1);return ca;}// 日期转化为大小写public static String dataToUpper(Date date) {Calendar ca = Calendar.getInstance();ca.setTime(date);int year = ca.get(Calendar.YEAR);int month = ca.get(Calendar.MONTH) + 1;int day = ca.get(Calendar.DAY_OF_MONTH);return DateUtil.numToUpper(year) + "年" + DateUtil.monthToUppder(month) + "月" + DateUtil.dayToUppder(day) + "日";}// 将数字转化为大写public static String numToUpper(int num) {// String u[] = {"零","壹","贰","叁","肆","伍","陆","柒","捌","玖"};String u[] = { "零", "一", "二", "三", "四", "五", "六", "七", "八", "九" };char[] str = String.valueOf(num).toCharArray();String rstr = "";for (int i = 0; i < str.length; i++) {rstr = rstr + u[Integer.parseInt(str[i] + "")];}return rstr;}// 月转化为大写public static String monthToUppder(int month) {if (month < 10) {return DateUtil.numToUpper(month);} else if (month == 10) {return "十";} else {return "十" + DateUtil.numToUpper(month - 10);}}// 日转化为大写public static String dayToUppder(int day) {if (day < 20) {return DateUtil.monthToUppder(day);} else {char[] str = String.valueOf(day).toCharArray();if (str[1] == '0') {return DateUtil.numToUpper(Integer.parseInt(str[0] + "")) + "十";} else {return DateUtil.numToUpper(Integer.parseInt(str[0] + "")) + "十" +DateUtil.numToUpper(Integer.parseInt(str[1] + ""));}}}/*** 在给定日期上增减一段时间*** @param dayAmount* 天数* @param date* 给定日期* @return 增减后的日期*/public static Date addDay2Date(int dayAmount, Date date) {Date newDate = null;if (date != null) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.add(Calendar.DAY_OF_MONTH, dayAmount);newDate = calendar.getTime();}return newDate;}/*** 用指定的格式格式化当前时间.*/public static String format(String pattern) {return format(new Date(), pattern);}/*** 用指定的格式格式化指定时间.*/public static String format(Date date, String pattern) {SimpleDateFormat df = new SimpleDateFormat(pattern);return df.format(date);}/*** 用尝试多种格式解析日期时间.** @param date 时间字符串* @return 如果无法解析，那么返回 {@code null}*/public static Date parse(String date) {Date d = parse(date, STD_PATTERNS);if (d == null) {d = parseRFC822Date(date);}if (d == null) {d = parseW3CDateTime(date);}if (d == null) {try {d = DateFormat.getInstance().parse(date);} catch (ParseException e) {d = null;}}return d;}/*** 用指定的格式解析日期时间.** @param date 时间字符串* @param pattern see {@link java.text.SimpleDateFormat}* @return 如果无法解析，那么返回 {@code null}*/public static Date parse(String date, String pattern) {SimpleDateFormat df = new SimpleDateFormat(pattern);df.setLenient(false);try {ParsePosition pp = new ParsePosition(0);Date d = df.parse(date, pp);if (d != null && pp.getIndex() == date.length()) {return d;}} catch (Exception e) {}return null;}/*** 用指定的格式解析日期时间.** @param date 时间字符串* @param patterns 多个模式，see {@link java.text.SimpleDateFormat}* @return 如果无法解析，那么返回 {@code null}*/public static Date parse(String date, String[] patterns) {if (date == null || date.length() == 0) {return null;}date = date.trim();for (String pattern : patterns) {SimpleDateFormat df = new SimpleDateFormat(pattern);df.setLenient(false);try {ParsePosition pp = new ParsePosition(0);Date d = df.parse(date, pp);if (d != null && pp.getIndex() == date.length()) {return d;}} catch (Exception e) {}}return null;}public static Date parseRFC822Date(String date) {int ipos = date.indexOf(" UT");if (ipos > -1) {String pre = date.substring(0, ipos);String post = date.substring(ipos + 3);date = pre + " GMT" + post;}return parse(date, RFC822_PATTENRS);}public static Date parseW3CDateTime(String date) {// if sDate has time on it, it injects 'GTM' before de TZ displacement// to allow the SimpleDateFormat parser to parse it properlyint tIndex = date.indexOf("T");if (tIndex > -1) {if (date.endsWith("Z")) {date = date.substring(0, date.length() - 1) + "+00:00";}int tzdIndex = date.indexOf("+", tIndex);if (tzdIndex == -1) {tzdIndex = date.indexOf("-", tIndex);}if (tzdIndex > -1) {String pre = date.substring(0, tzdIndex);int secFraction = pre.indexOf(",");if (secFraction > -1) {pre = pre.substring(0, secFraction);}String post = date.substring(tzdIndex);date = pre + "GMT" + post;}} else {date += "T00:00GMT";}return parse(date, W3CDATETIME_PATTERNS);}public static String formatRFC822(Date date) {SimpleDateFormat df = new SimpleDateFormat(RFC822_DATETIME_PATTERN);df.setTimeZone(TimeZone.getTimeZone("GMT"));return df.format(date);}public static String formatW3CDateTime(Date date) {SimpleDateFormat df = new SimpleDateFormat(W3C_DATETIME_PATTERN);df.setTimeZone(TimeZone.getTimeZone("GMT"));return df.format(date);}// Date类型转化为XMLGregorianCalendar类型public static XMLGregorianCalendar converDateToXML(Date date){if (date != null) {// Date类型转化为XMLGregorianCalendar类型GregorianCalendar cal = new GregorianCalendar();cal.setTime(date);XMLGregorianCalendar gc = null;try {gc = DatatypeFactory.newInstance().newXMLGregorianCalendar(cal);} catch (Exception e) {e.printStackTrace();}return gc;}else{return null;}}/*** 获取给定日期一年前的日期** @param n,date* @return 返回的日期*/public static String getBeforeDate(int n,String date) {String getBeforeDate = "";try {Date d = convertStringToDate(DateUtil.datePattern,date);Calendar c = Calendar.getInstance();c.setTime(d);c.add(Calendar.YEAR, n);//当前时间减去一年，即一年前的时间Date time = c.getTime();getBeforeDate = format(time, DateUtil.datePattern);return getBeforeDate;} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();}return getBeforeDate;}public static String getMonths(String start,String end) {Date d1 = parse(start, DateUtil.datePattern);Date d2 = parse(end, DateUtil.datePattern);Calendar bef = Calendar.getInstance();Calendar aft = Calendar.getInstance();bef.setTime(d1);aft.setTime(d2);int result = aft.get(Calendar.MONTH) - bef.get(Calendar.MONTH);int month = (aft.get(Calendar.YEAR) - bef.get(Calendar.YEAR)) * 12;int str = Math.abs(month + result);return String.valueOf(str);}public static String[] getStartAndEndDate() {// 获取当前年份、月份、日期Calendar cale = Calendar.getInstance();// 获取当月第一天和最后一天SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");String firstday, lastday;// 获取前月的第一天cale = Calendar.getInstance();cale.add(Calendar.MONTH, 0);cale.set(Calendar.DAY_OF_MONTH, 1);firstday = format.format(cale.getTime());// 获取前月的最后一天cale = Calendar.getInstance();cale.add(Calendar.MONTH, 1);cale.set(Calendar.DAY_OF_MONTH, 0);lastday = format.format(cale.getTime());String[] str = new String[2];str[0] = firstday;str[1] = lastday;return str;}public static String getLastDayOfMonth(String date) {Date d = parse(date, "yyyy-MM-dd");Calendar cal = Calendar.getInstance();cal.setTime(d);int last = cal.getActualMaximum(Calendar.DAY_OF_MONTH);cal.set(Calendar.DAY_OF_MONTH, last);String str = format(cal.getTime(), "yyyy-MM-dd");return str;}
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