关于Calendar的一些用法总结

import java.util.Calendar;

import java.security.KeyStore.TrustedCertificateEntry;

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;

/**

* 常用日历操作辅助类

public class CalendarUtil {

// 用来全局控制上一周，本周，下一周的周数变化

private int weeks = 0;

private int MaxDate;// 一月最大天数

private int MaxYear;// 一年最大天数

private static Calendar calendar = Calendar.getInstance();//实例化日历

/**测试

* @param args

public static void main(String[] args) {

CalendarUtil tt = new CalendarUtil();

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

//-------------------------------------------------------------

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

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

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

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

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("---------------->");

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("获得本年有多少天:"+tt.getMaxYear());

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

System.out.println("根据日期获得当天周几:" + tt.getWeek("2018-10-15"));

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("获取两个日期之间间隔天数2018-5-1~2018-4-1:"

+ CalendarUtil.getTwoDay("2018-5-1", "2018-4-1"));

System.out.println("获得半年后的日期：" + tt.convertDateToString(tt.getTimeYearNext()));

//-------------------------------------------------------------

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());

//-------------------------季度需单独运行，否则会受之前日期的影响------------------------------------

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

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

//-------------------------------------------------------------

System.out.println("得到几天前的日期："+ tt.getDateBefore("2018-6-15", 20));

}

// 获取当天时间

public String getNowTime(String dateformat) {//传入参数为日期的格式

Date now = new Date();

SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);// 可以方便地修改日期格式

String toDay = dateFormat.format(now);

return toDay;

}

// 获得本周一的日期

public String getMondayOFWeek() {

CalendarUtil tt = new CalendarUtil();

int mondayPlus =tt.getMondayPlus();//调用getMondayPlus方法获得当前日期与本周一相差的天数

GregorianCalendar currentDate = new GregorianCalendar();

currentDate.add(GregorianCalendar.DATE, mondayPlus); //当天天数与相差的天数进行相加得到周一在本周的天数

Date monday = currentDate.getTime(); //根据天数获得时间

DateFormat df = DateFormat.getDateInstance();

String preMonday = df.format(monday);

return preMonday;

}

// 获得当前日期与本周一相差的天数

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，星期一是第二天......

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; //如果是周一返回0(无相差天数)

} else {

//返回与周一相差的天数(用以当天和相差天数计算)

//如果今天为周五首先dayOfWeek == 5, 1-5则返回-4,当前减去4天就为周一的日期

return 1 - dayOfWeek;

}

// 获得本周星期日的日期

public String getSundayWeekday() {

int mondayPlus = this.getMondayPlus();

GregorianCalendar currentDate = new GregorianCalendar();

currentDate.add(GregorianCalendar.DATE, mondayPlus + 6); //当天天数与相差的天数进行相加得到周日在本周的天数

Date monday = currentDate.getTime();

DateFormat df = DateFormat.getDateInstance();

String preMonday = df.format(monday);

return preMonday;

}

// 获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); //本周周一的天数减去1天

Date monday = currentDate.getTime();

DateFormat df = DateFormat.getDateInstance();

String preMonday = df.format(monday);

return preMonday;

}

// 获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);//本周周一的天数减去7天

Date monday = currentDate.getTime();

DateFormat df = DateFormat.getDateInstance();

String preMonday = df.format(monday);

return preMonday;

}

// 获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);//本周周一的天数加7天

Date monday = currentDate.getTime();

DateFormat df = DateFormat.getDateInstance();

String preMonday = df.format(monday);

return preMonday;

}

// 获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;

}

//----------------------------------------------------------

// 获取当月第一天

public String getFirstDayOfMonth() {

String str = "";

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

Calendar date = Calendar.getInstance();

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

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

return str;

}

// 计算当月最后一天,返回字符串

public String getDefaultDay() {

String str = "";

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

Calendar date = Calendar.getInstance();

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

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

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

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

return str;

}

// 上月第一天

public String getPreviousMonthFirst() {

String str = "";

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

Calendar date = Calendar.getInstance();

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

date.add(Calendar.MONTH, -1);// 减一个月，变为上月的1号

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

return str;

}

// 获得上月最后一天的日期

public String getPreviousMonthEnd() {

String str = "";

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

Calendar date = Calendar.getInstance();

date.add(Calendar.MONTH, -1);// 减一个月

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

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

// date.set(Calendar.DATE, 1);

// date.add(Calendar.DATE,-1);

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

return str;

}

// 获得下个月第一天的日期

public String getNextMonthFirst() {

String str = "";

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

Calendar date = Calendar.getInstance();

date.add(Calendar.MONTH, 1);// 减一个月

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

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

return str;

}

// 获得下个月最后一天的日期

public String getNextMonthEnd() {

String str = "";

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

Calendar date = Calendar.getInstance();

date.add(Calendar.MONTH, 1);// 加一个月

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

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

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

return str;

}

//---------------------------------------------------------

//获得今天是这个月的第几周

public static int getWeekOfMonth() {

return calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH);

}

//获得当前年份

public static int getYear() {

return calendar.get(Calendar.YEAR);

}

//获得当前年份

public static int getMonth() {

return calendar.get(Calendar.MONTH) + 1;

}

//获得今天在本年的第几天

public static int getDayOfYear() {

return calendar.get(Calendar.DAY_OF_YEAR);

}

//获得今天在本月的第几天(获得当前日)

public static int getDayOfMonth() {

return calendar.get(Calendar.DAY_OF_MONTH);

}

//获得今天在本周的第几天

public static int getDayOfWeek() {

return calendar.get(Calendar.DAY_OF_WEEK);

}

//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 + "";

}

//获得半年后的日期

public static Date getTimeYearNext() {

calendar.add(Calendar.DAY_OF_YEAR, 183);

return calendar.getTime();

}

public static String convertDateToString(Date dateTime){

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

return df.format(dateTime);

}

//---------------------------------------------------------------

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;

}

// 获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;

}

// 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;

}

// 获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);// 加一个年

lastDate.set(Calendar.DAY_OF_YEAR, 1);

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

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

return str;

}

// 获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);// 加一个年

lastDate.set(Calendar.DAY_OF_YEAR, 1);

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

return str;

}

// 获得本季度第一天

public String getThisSeasonFirstTime() {

int month = calendar.get(Calendar.MONTH) + 1;

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;

}

// 获得本季度最后一天

public String getThisSeasonFinallyTime() {

int month =calendar.get(Calendar.MONTH) + 1;

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;

}

//------------------------------------------------------------------------------

//根据一个日期，返回是星期几的字符串

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()); //EEEE代表星期几

}

//将短时间格式字符串转换为时间 yyyy-MM-dd

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;

}

/* 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;

}

} */

// 获得本年有多少天

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;

}

//获取某年某月的最后一天

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;//闰年

} else {

return 28; //平年

}

return 0;

}

/**

* 计算闰年和平年

* 闰年二月是29天，但不是能被4整除的就是闰年

* @param year

* @return

private boolean isLeapYear(int year) {

boolean ison = true;

if((year%4==0&&year%100!=0)||year%400==0) {

ison = true;//闰年

}else {

ison = false;//平年

}

return ison;

}

//系统当前时间

public static String getCurrentDate (){

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

return sdf.format(calendar.getTime());

}

//得到几天前的时间

public static String getDateBefore(String d,int day){

Calendar date =Calendar.getInstance();

Date dd = strToDate(d);

date.setTime(dd);

date.set(Calendar.DATE,date.get(Calendar.DATE)-day);

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

return sdf.format(date.getTime());

}

/* //得到几天后的时间

public static Date getDateAfter(Date d,int day){

Calendar now =Calendar.getInstance();

now.setTime(d);

now.set(Calendar.DATE,now.get(Calendar.DATE)+day);

return now.getTime();

} */

//计算月份差

public static int getMonthSpace(String firstTime,String lastTime) {

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

Calendar c1 = Calendar.getInstance();

Calendar c2 = Calendar.getInstance();

try {

c1.setTime(sdf.parse(lastTime));

c2.setTime(sdf.parse(firstTime));

} catch (ParseException e) {

e.printStackTrace();

}

int result =(c1.get(Calendar.YEAR)-c2.get(Calendar.YEAR))*12+(c1.get(Calendar.MONTH)-c2.get(Calendar.MONTH));

return result ==0 ? 1 : result;

}

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