Java——各种日期的获取（来自别人分享）

import java.text.DateFormat;

import java.text.ParsePosition;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

public class CalendarUtil {

private int weeks = 0;// 用来全局控制上一周，本周，下一周的周数变化

private int MaxDate; // 一月最大天数

private int MaxYear; // 一年最大天数

public static void main(String[] args) {

CalendarUtil tt = new CalendarUtil();

System.out.println("获取当天日期:" + tt.getNowTime("yyyy-MM-dd"));

System.out.println("获取本周一日期:" + tt.getMondayOFWeek());

System.out.println("获取本周日的日期~:" + tt.getCurrentWeekday());

System.out.println("获取上周一日期:" + tt.getPreviousWeekday());

System.out.println("获取上周日日期:" + tt.getPreviousWeekSunday());

System.out.println("获取下周一日期:" + tt.getNextMonday());

System.out.println("获取下周日日期:" + tt.getNextSunday());

System.out.println("获得相应周的周六的日期:" + tt.getNowTime("yyyy-MM-dd"));

System.out.println("获取本月第一天日期:" + tt.getFirstDayOfMonth());

System.out.println("获取本月最后一天日期:" + tt.getDefaultDay());

System.out.println("获取上月第一天日期:" + tt.getPreviousMonthFirst());

System.out.println("获取上月最后一天的日期:" + tt.getPreviousMonthEnd());

System.out.println("获取下月第一天日期:" + tt.getNextMonthFirst());

System.out.println("获取下月最后一天日期:" + tt.getNextMonthEnd());

System.out.println("获取本年的第一天日期:" + tt.getCurrentYearFirst());

System.out.println("获取本年最后一天日期:" + tt.getCurrentYearEnd());

System.out.println("获取去年的第一天日期:" + tt.getPreviousYearFirst());

System.out.println("获取去年的最后一天日期:" + tt.getPreviousYearEnd());

System.out.println("获取明年第一天日期:" + tt.getNextYearFirst());

System.out.println("获取明年最后一天日期:" + tt.getNextYearEnd());

System.out.println("获取本季度第一天:" + tt.getThisSeasonFirstTime(11));

System.out.println("获取本季度最后一天:" + tt.getThisSeasonFinallyTime(11));

System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"

+ CalendarUtil.getTwoDay("2008-12-1", "2008-9-29"));

System.out.println("获取当前月的第几周：" + tt.getWeekOfMonth());

System.out.println("获取当前年份：" + tt.getYear());

System.out.println("获取当前月份：" + tt.getMonth());

System.out.println("获取今天在本年的第几天：" + tt.getDayOfYear());

System.out.println("获得今天在本月的第几天(获得当前日)：" + tt.getDayOfMonth());

System.out.println("获得今天在本周的第几天：" + tt.getDayOfWeek());

System.out.println("获得半年后的日期："

+ tt.convertDateToString(tt.getTimeYearNext())); }

public static int getYear() {

return Calendar.getInstance().get(Calendar.YEAR);}

public static int getMonth() {

return Calendar.getInstance().get(Calendar.MONTH) + 1; }

public static int getDayOfYear() {

return Calendar.getInstance().get(Calendar.DAY_OF_YEAR);}

public static int getDayOfMonth() {

return Calendar.getInstance().get(Calendar.DAY_OF_MONTH);}

public static int getDayOfWeek() {

return Calendar.getInstance().get(Calendar.DAY_OF_WEEK);}

public static int getWeekOfMonth() {

return Calendar.getInstance().get(Calendar.DAY_OF_WEEK_IN_MONTH);}

public static Date getTimeYearNext() {

Calendar.getInstance().add(Calendar.DAY_OF_YEAR, 183);

return Calendar.getInstance().getTime();}

public static String convertDateToString(Date dateTime) {

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

return df.format(dateTime);

}

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) {

// 再转换为时间

Date date = CalendarUtil.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 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;

// 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;

}

public String getDefaultDay() {

String str = "";

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();

lastDate.set(Calendar.DATE, 1);// 设为当前月的1号

lastDate.add(Calendar.MONTH, 1);// 加一个月，变为下月的1号

lastDate.add(Calendar.DATE, -1);// 减去一天，变为当月最后一天

str = sdf.format(lastDate.getTime());

return str;

}

public String getPreviousMonthFirst() {

String str = "";

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();

lastDate.set(Calendar.DATE, 1);// 设为当前月的1号

lastDate.add(Calendar.MONTH, -1);// 减一个月，变为下月的1号

// lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天

str = sdf.format(lastDate.getTime());

return str;

}

public String getFirstDayOfMonth() {

String str = "";

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();

lastDate.set(Calendar.DATE, 1);// 设为当前月的1号

str = sdf.format(lastDate.getTime());

return str;

}

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;

}

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;

}

private int getMondayPlus() {

Calendar cd = Calendar.getInstance();

// 获得今天是一周的第几天，星期日是第一天，星期二是第二天......

int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; // 因为按中国礼拜一作为第一天所以这里减1

if (dayOfWeek == 1) {

return 0;

} else {

return 1 - dayOfWeek;

}

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;

}

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;

}

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;

}

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;

}

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;

}

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);// 把日期设置为当月第一天

cd.roll(Calendar.DATE, -1);// 日期回滚一天，也就是最后一天

MaxDate = cd.get(Calendar.DATE);

if (monthOfNumber == 1) {

return -MaxDate;

} else {

return 1 - monthOfNumber;

}

public String getPreviousMonthEnd() {

String str = "";

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();

lastDate.add(Calendar.MONTH, -1);// 减一个月

lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天

lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天

str = sdf.format(lastDate.getTime());

return str;

}

public String getNextMonthFirst() {

String str = "";

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();

lastDate.add(Calendar.MONTH, 1);// 减一个月

lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天

str = sdf.format(lastDate.getTime());

return str;

}

public String getNextMonthEnd() {

String str = "";

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();

lastDate.add(Calendar.MONTH, 1);// 加一个月

lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天

lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天

str = sdf.format(lastDate.getTime());

return str;

}

public String getNextYearEnd() {

String str = "";

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();

lastDate.add(Calendar.YEAR, 1);// 加一个年

lastDate.set(Calendar.DAY_OF_YEAR, 1);

lastDate.roll(Calendar.DAY_OF_YEAR, -1);

str = sdf.format(lastDate.getTime());

return str;

}

public String getNextYearFirst() {

String str = "";

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar lastDate = Calendar.getInstance();

lastDate.add(Calendar.YEAR, 1);// 加一个年

lastDate.set(Calendar.DAY_OF_YEAR, 1);

str = sdf.format(lastDate.getTime());

return str;

}

private int getMaxYear() {

Calendar cd = Calendar.getInstance();

cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天

cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。

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);// 获得当天是一年中的第几天

cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天

cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。

int MaxYear = cd.get(Calendar.DAY_OF_YEAR);

if (yearOfNumber == 1) {

return -MaxYear;

} else {

return 1 - yearOfNumber;

}

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;

}

// 获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";

}

// 获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";

}

// 获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);

return preYearDay;

}

public String getThisSeasonFirstTime(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;

return seasonDate;

}

public String getThisSeasonFinallyTime(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 + "-" + 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;

}

public boolean isLeapYear(int year) {

return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);

}

public boolean isLeapYear2(int year) {

return new GregorianCalendar().isLeapYear(year);

}

</pre>

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