int DAY_OF_MONTH
get 和 set 的字段数字,指示一个月中的某天。
int DAY_OF_WEEK
get 和 set 的字段数字,指示一个星期中的某天。
int DAY_OF_WEEK_IN_MONTH
get 和 set 的字段数字,指示当前月中的第几个星期。
int DAY_OF_YEAR
get 和 set 的字段数字,指示当前年中的天数
int WEDNESDAY
指示 Wednesday 的 DAY_OF_WEEK 字段值。
int WEEK_OF_MONTH
get 和 set 的字段数字,指示当前月中的星期数。
int WEEK_OF_YEAR
get 和 set 的字段数字,指示当前年中的星期数。
自己写的
import java.util.Calendar;
public class ExcelTime {
/*
* 获取某年某月1号的星期序号
*/
public int getFirstDay(int year,int month){
Calendar now = Calendar.getInstance();
now.set(year, month-1, 1);
int firstDay= now.get(Calendar.DAY_OF_WEEK);
if(firstDay==1)return 7;
else{
return (firstDay+6)%7;
}
}
/*
* 求某年某月的总天数
*/
public int getDates(int year,int month){
Calendar c = Calendar.getInstance();
//设置为该月,例如08年1月,日期随意
c.set(year,month-1,1);
//获得该月的日期
int dates = c.getActualMaximum(Calendar.DATE);
return dates;
}
/*
* 求某年某月星期的总数
*/
public int getDays(int year,int month){
if(getDates(year,month)-28>6)return 6;
if(getDates(year,month)==28&&getFirstDay(year,month)==1)return 4;
else return 5;
}
}
一下是在其他文章中找到的
- <PRE class=java name="code">package com.iwode.common;
- import java.text.DateFormat;
- 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
- *
- * @author steven 2010-08-10
- * @email:qing.tan@iwode.com
- */
- 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
- /**
- * 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"));
- 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()));
- }
- /**
- * 获得当前年份
- *
- * @return
- */
- public static int getYear() {
- return Calendar.getInstance().get(Calendar.YEAR);
- }
- /**
- * 获得当前月份
- *
- * @return
- */
- public static int getMonth() {
- return Calendar.getInstance().get(Calendar.MONTH) + 1;
- }
- /**
- * 获得今天在本年的第几天
- *
- * @return
- */
- public static int getDayOfYear() {
- return Calendar.getInstance().get(Calendar.DAY_OF_YEAR);
- }
- /**
- * 获得今天在本月的第几天(获得当前日)
- *
- * @return
- */
- public static int getDayOfMonth() {
- return Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
- }
- /**
- * 获得今天在本周的第几天
- *
- * @return
- */
- public static int getDayOfWeek() {
- return Calendar.getInstance().get(Calendar.DAY_OF_WEEK);
- }
- /**
- * 获得今天是这个月的第几周
- *
- * @return
- */
- public static int getWeekOfMonth() {
- return Calendar.getInstance().get(Calendar.DAY_OF_WEEK_IN_MONTH);
- }
- /**
- * 获得半年后的日期
- *
- * @return
- */
- public static Date getTimeYearNext() {
- Calendar.getInstance().add(Calendar.DAY_OF_YEAR, 183);
- return Calendar.getInstance().getTime();
- }
- /**
- * 将日期转换成字符串
- *
- * @param dateTime
- * @return
- */
- public static String convertDateToString(Date dateTime) {
- SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
- return df.format(dateTime);
- }
- /**
- * 得到二个日期间的间隔天数
- *
- * @param sj1
- * @param sj2
- * @return
- */
- 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 + "";
- }
- /**
- * 根据一个日期,返回是星期几的字符串
- *
- * @param sdate
- * @return
- */
- 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());
- }
- /**
- * 将短时间格式字符串转换为时间 yyyy-MM-dd
- *
- * @param strDate
- * @return
- */
- 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;
- }
- /**
- * 两个时间之间的天数
- *
- * @param date1
- * @param date2
- * @return
- */
- 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;
- }
- /**
- * 计算当月最后一天,返回字符串
- *
- * @return
- */
- 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;
- }
- /**
- * 上月第一天
- *
- * @return
- */
- 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;
- }
- /**
- * 获取当月第一天
- *
- * @return
- */
- 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;
- }
- /**
- * 获得本周星期日的日期
- *
- * @return
- */
- 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;
- }
- /**
- * 获取当天时间
- *
- * @param dateformat
- * @return
- */
- 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;
- }
- /**
- * 获得当前日期与本周日相差的天数
- *
- * @return
- */
- 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;
- }
- }
- /**
- * 获得本周一的日期
- *
- * @return
- */
- 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;
- }
- /**
- * 获得相应周的周六的日期
- *
- * @return
- */
- 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;
- }
- /**
- * 获得上周星期日的日期
- *
- * @return
- */
- 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;
- }
- /**
- * 获得上周星期一的日期
- *
- * @return
- */
- 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;
- }
- /**
- * 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);
- 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;
- }
- 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;
- }
- }
- /**
- * 获得上月最后一天的日期
- *
- * @return
- */
- 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;
- }
- /**
- * 获得下个月第一天的日期
- *
- * @return
- */
- 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;
- }
- /**
- * 获得下个月最后一天的日期
- *
- * @return
- */
- 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;
- }
- /**
- * 获得明年最后一天的日期
- *
- * @return
- */
- 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
- *
- * @return
- */
- 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;
- }
- /**
- * 获得本年有多少天
- *
- * @return
- */
- 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;
- }
- }
- /**
- * 获得本年第一天的日期
- *
- * @return
- */
- 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;
- }
- /**
- * 获得本季度第一天
- *
- * @param month
- * @return
- */
- 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;
- }
- /**
- * 获得本季度最后一天
- *
- * @param month
- * @return
- */
- 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;
- }
- /**
- * 获取某年某月的最后一天
- *
- * @param year
- * 年
- * @param month
- * 月
- * @return 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;
- } else {
- return 28;
- }
- }
- return 0;
- }
- /**
- * 是否闰年
- *
- * @param year
- * 年
- * @return
- */
- public boolean isLeapYear(int year) {
- return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
- }
- /**
- * 是否闰年
- *
- * @param year
- * @return
- */
- public boolean isLeapYear2(int year) {
- return new GregorianCalendar().isLeapYear(year);
- }
- }