import java.text.DateFormat; import java.text.ParseException; import java.text.ParsePosition; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar;public class MyTestDate {// 用來全局控制 上一周，本周，下一周的周數變化private int weeks = 0;private int MaxDate;// 一月最大天數private int MaxYear;// 一年最大天數public static void main(String[] args) {MyTestDate tt = new MyTestDate();System.out.println("獲取當天日期:" + tt.getNowTime("yyyy-MM-dd"));System.out.println("獲取本周一日期:" + tt.getMondayOFWeek());System.out.println("獲取本周日的日期~:" + tt.getCurrentWeekday());System.out.println("獲取上周一日期:" + tt.getPreviousWeekday());System.out.println("獲取上周日日期:" + tt.getPreviousWeekSunday());System.out.println("獲取下周一日期:" + tt.getNextMonday());System.out.println("獲取下周日日期:" + tt.getNextSunday());System.out.println("獲得相應周的周六的日期:" + tt.getNowTime("yyyy-MM-dd"));System.out.println("獲取本月第一天日期:" + tt.getFirstDayOfMonth());System.out.println("獲取本月最后一天日期:" + tt.getDefaultDay());System.out.println("獲取上月第一天日期:" + tt.getPreviousMonthFirst());System.out.println("獲取上月最后一天的日期:" + tt.getPreviousMonthEnd());System.out.println("獲取下月第一天日期:" + tt.getNextMonthFirst());System.out.println("獲取下月最后一天日期:" + tt.getNextMonthEnd());System.out.println("獲取本年的第一天日期:" + tt.getCurrentYearFirst());System.out.println("獲取本年最后一天日期:" + tt.getCurrentYearEnd());System.out.println("獲取去年的第一天日期:" + tt.getPreviousYearFirst());System.out.println("獲取去年的最后一天日期:" + tt.getPreviousYearEnd());System.out.println("獲取明年第一天日期:" + tt.getNextYearFirst());System.out.println("獲取明年最后一天日期:" + tt.getNextYearEnd());System.out.println("獲取本季度第一天到最后一天:" + tt.getThisSeasonTime(11));System.out.println("獲得本年有多少天：" + tt.getMaxYear() );System.out.println("獲得昨天的日期：" + tt.getYesterday(tt.getNowTime("yyyy-MM-dd")));System.out.println("獲得明天的日期：" + tt.getTomorrow(tt.getNowTime("yyyy-MM-dd")));System.out.println("獲取兩個日期之間間隔天數2008-12-1~2008-9.29:"+ MyTestDate.getTwoDay("2008-12-1", "2008-9-29"));}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 + "";}public static String getWeek(String sdate) {// 再轉換為時間Date date = MyTestDate.strToDate(sdate);Calendar c = Calendar.getInstance();c.setTime(date);// int hour=c.get(Calendar.DAY_OF_WEEK);// hour中存的就是星期幾了，其范圍 1~7// 1=星期日 7=星期六，其他類推return new SimpleDateFormat("EEEE").format(c.getTime());}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;}public static long getDays(String date1, String date2) {if (date1 == null || date1.equals(""))return 0;if (date2 == null || date2.equals(""))return 0;// 轉換為標準時間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;}// 計算當月最后一天,返回字符串public String getDefaultDay() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.set(Calendar.DATE, 1);// 設為當前月的1號lastDate.add(Calendar.MONTH, 1);// 加一個月，變為下月的1號lastDate.add(Calendar.DATE, -1);// 減去一天，變為當月最后一天str = sdf.format(lastDate.getTime());return str;}// 上月第一天public String getPreviousMonthFirst() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.set(Calendar.DATE, 1);// 設為當前月的1號lastDate.add(Calendar.MONTH, -1);// 減一個月，變為下月的1號// lastDate.add(Calendar.DATE,-1);//減去一天，變為當月最后一天str = sdf.format(lastDate.getTime());return str;}// 獲取當月第一天public String getFirstDayOfMonth() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.set(Calendar.DATE, 1);// 設為當前月的1號str = sdf.format(lastDate.getTime());return str;}// 獲得本周星期日的日期public String getCurrentWeekday() {weeks = 0;int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + 6);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}// 獲取當天時間public String getNowTime(String dateformat) {Date now = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);// 可以方便地修改日期格式String hehe = dateFormat.format(now);return hehe;}// 獲得當前日期與本周日相差的天數private int getMondayPlus() {Calendar cd = Calendar.getInstance();// 獲得今天是一周的第幾天，星期日是第一天，星期二是第二天......int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; // 因為按中國禮拜一作為第一天所以這里減1if (dayOfWeek == 1) {return 0;} else {return 1 - dayOfWeek;}}// 獲得本周一的日期public String getMondayOFWeek() {weeks = 0;int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}// 獲得相應周的周六的日期public String getSaturday() {int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}// 獲得上周星期日的日期public String getPreviousWeekSunday() {weeks = 0;weeks--;int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + weeks);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}// 獲得上周星期一的日期public String getPreviousWeekday() {weeks--;int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}// 獲得下周星期一的日期public String getNextMonday() {weeks++;int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + 7);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}// 獲得下周星期日的日期public String getNextSunday() {int mondayPlus = this.getMondayPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 + 6);Date monday = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preMonday = df.format(monday);return preMonday;}private int getMonthPlus() {Calendar cd = Calendar.getInstance();int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);cd.set(Calendar.DATE, 1);// 把日期設置為當月第一天cd.roll(Calendar.DATE, -1);// 日期回滾一天，也就是最后一天MaxDate = cd.get(Calendar.DATE);if (monthOfNumber == 1) {return -MaxDate;} else {return 1 - monthOfNumber;}}// 獲得上月最后一天的日期public String getPreviousMonthEnd() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.add(Calendar.MONTH, -1);// 減一個月lastDate.set(Calendar.DATE, 1);// 把日期設置為當月第一天lastDate.roll(Calendar.DATE, -1);// 日期回滾一天，也就是本月最后一天str = sdf.format(lastDate.getTime());return str;}// 獲得下個月第一天的日期public String getNextMonthFirst() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.add(Calendar.MONTH, 1);// 減一個月lastDate.set(Calendar.DATE, 1);// 把日期設置為當月第一天str = sdf.format(lastDate.getTime());return str;}// 獲得下個月最后一天的日期public String getNextMonthEnd() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.add(Calendar.MONTH, 1);// 加一個月lastDate.set(Calendar.DATE, 1);// 把日期設置為當月第一天lastDate.roll(Calendar.DATE, -1);// 日期回滾一天，也就是本月最后一天str = sdf.format(lastDate.getTime());return str;}// 獲得明年最后一天的日期public String getNextYearEnd() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.add(Calendar.YEAR, 1);// 加一個年lastDate.set(Calendar.DAY_OF_YEAR, 1);lastDate.roll(Calendar.DAY_OF_YEAR, -1);str = sdf.format(lastDate.getTime());return str;}// 獲得明年第一天的日期public String getNextYearFirst() {String str = "";SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Calendar lastDate = Calendar.getInstance();lastDate.add(Calendar.YEAR, 1);// 加一個年lastDate.set(Calendar.DAY_OF_YEAR, 1);str = sdf.format(lastDate.getTime());return str;}// 獲得本年有多少天private int getMaxYear() {Calendar cd = Calendar.getInstance();cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期設為當年第一天cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滾一天。int MaxYear = cd.get(Calendar.DAY_OF_YEAR);return MaxYear;}private int getYearPlus() {Calendar cd = Calendar.getInstance();int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);// 獲得當天是一年中的第幾天cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期設為當年第一天cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滾一天。int MaxYear = cd.get(Calendar.DAY_OF_YEAR);if (yearOfNumber == 1) {return -MaxYear;} else {return 1 - yearOfNumber;}}// 獲得本年第一天的日期public String getCurrentYearFirst() {int yearPlus = this.getYearPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, yearPlus);Date yearDay = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preYearDay = df.format(yearDay);return preYearDay;}// 獲得本年最后一天的日期 *public String getCurrentYearEnd() {Date date = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式String years = dateFormat.format(date);return years + "-12-31";}// 獲得上年第一天的日期 *public String getPreviousYearFirst() {Date date = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式String years = dateFormat.format(date);int years_value = Integer.parseInt(years);years_value--;return years_value + "-1-1";}// 獲得上年最后一天的日期public String getPreviousYearEnd() {weeks--;int yearPlus = this.getYearPlus();GregorianCalendar currentDate = new GregorianCalendar();currentDate.add(GregorianCalendar.DATE, yearPlus + MaxYear * weeks+ (MaxYear - 1));Date yearDay = currentDate.getTime();DateFormat df = DateFormat.getDateInstance();String preYearDay = df.format(yearDay);getThisSeasonTime(11);return preYearDay;}/*** 比較兩個日期的大小* 返回值：* 1.第一個日期在第二個日期前面* -1.第一個日期在第二個日期后面* 0.兩個日期相等*/public int compare_date(String DATE1, String DATE2) {DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm");try {Date dt1 = df.parse(DATE1);Date dt2 = df.parse(DATE2);if (dt1.getTime() > dt2.getTime()) {System.out.println("dt1 在dt2前");return 1;} else if (dt1.getTime() < dt2.getTime()) {System.out.println("dt1在dt2后");return -1;} else {return 0;}} catch (Exception exception) {exception.printStackTrace();}return 0;}/*** 用compareTo比較兩個日期的大小* 比較兩個string的大小* 返回值：* 大于0 ：第一個日期在第二個日期前面* 小于0 ：第一個日期在第二個日期后面* 等于0 ：兩個日期相等*/public int compare_twoDate(String date1 , String date2){return (int)date1.compareTo(date2);}//獲得昨天的日期public String getYesterday(String nowDate) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); try { Date date = sdf.parse(nowDate); if(date == null) { return null; } Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.add(Calendar.DAY_OF_MONTH, -1); return sdf.format(cal.getTime()); } catch (ParseException e) { return null; } }//獲得明天的日期public String getTomorrow(String nowDate) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); try { Date date = sdf.parse(nowDate); if(date == null) { return null; } Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.add(Calendar.DAY_OF_MONTH, 1); return sdf.format(cal.getTime()); } catch (ParseException e) { return null; } }// 獲得本季度public String getThisSeasonTime(int month) {int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } };int season = 1;if (month >= 1 && month <= 3) {season = 1;}if (month >= 4 && month <= 6) {season = 2;}if (month >= 7 && month <= 9) {season = 3;}if (month >= 10 && month <= 12) {season = 4;}int start_month = array[season - 1][0];int end_month = array[season - 1][2];Date date = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式String years = dateFormat.format(date);int years_value = Integer.parseInt(years);int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);int end_days = getLastDayOfMonth(years_value, end_month);String seasonDate = years_value + "-" + start_month + "-" + start_days+ ";" + years_value + "-" + end_month + "-" + end_days;return seasonDate;}private int getLastDayOfMonth(int year, int month) {if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8|| month == 10 || month == 12) {return 31;}if (month == 4 || month == 6 || month == 9 || month == 11) {return 30;}if (month == 2) {if (isLeapYear(year)) {return 29;} else {return 28;}}return 0;}//判斷時候是閏年public boolean isLeapYear(int year) {return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);} }

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