java取当前周期、月初至月末、季度初至季度末日期。

问题描述：

需求1：当前登陆日期的周一至周五的日期比如现在是2012-06-11 周一是2012-06-11 周五就是 2012-06-15。

需求2：月初至月末。同上。当前登陆的时间算出月初和月末的时间。

需求3：季度初和季度末。同上。当前登陆时间算出季度的第一天和季度末的最后一天。

求函数。谢谢。。整了1天多没整出来。。。时间不够了就上来发个需求。。

答

我给你写了个，参考一下嘛：
[code="java"]
Calendar calendar = new GregorianCalendar();
// 1. 当前登陆日期的周一至周五的日期比如现在是2012-06-11 周一是2012-06-11 周五就是 2012-06-15。
calendar.set(Calendar.DAY_OF_WEEK, 2);
System.out.println("登录日期的周一：" + print(calendar.getTime()));
// 2.星期五，第六天s
calendar.set(Calendar.DAY_OF_WEEK, 6);
System.out.println("登录日期的周五：" + print(calendar.getTime()));
// 3.当前月的第一天
calendar.set(Calendar.DAY_OF_MONTH, 1);
System.out.println("当前月的第一天：" + print(calendar.getTime()));
// 4.当前月的最后一天
calendar.add(Calendar.MONTH, 1);
calendar.set(Calendar.DAY_OF_MONTH, 0);
System.out.println("当前月的最后一天：" + print(calendar.getTime()));

    // 季度初
    calendar.setTime(new Date());
    int month = getQuarterInMonth(calendar.get(Calendar.MONTH), true);
    calendar.set(Calendar.MONTH, month);
    calendar.set(Calendar.DAY_OF_MONTH, 1);
    System.out.println("当季度的第一天：" + print(calendar.getTime()));
    // 季度末
    calendar.setTime(new Date());
    month = getQuarterInMonth(calendar.get(Calendar.MONTH), false);
    calendar.set(Calendar.MONTH, month + 1);
    calendar.set(Calendar.DAY_OF_MONTH, 0);
    System.out.println("当前时间的季度末：" + print(calendar.getTime()));
}

private static String print(Date d) {
    DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    return df.format(d);
}

// 返回第几个月份，不是几月
// 季度一年四季， 第一季度：2月-4月， 第二季度：5月-7月， 第三季度：8月-10月， 第四季度：11月-1月
private static int getQuarterInMonth(int month, boolean isQuarterStart) {
    int months[] = { 1, 4, 7, 10 };
    if (!isQuarterStart) {
        months = new int[] { 3, 6, 9, 12 };
    }
    if (month >= 2 && month <= 4)
        return months[0];
    else if (month >= 5 && month <= 7)
        return months[1];
    else if (month >= 8 && month <= 10)
        return months[2];
    else
        return months[3];
}[/code]

答

package com.bruce.test.testcalendar;

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 */ @SuppressWarnings("static-access") 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;
  }
@SuppressWarnings("unused")
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 */ @SuppressWarnings("unused") 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);
  @SuppressWarnings("unused")
  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
  */
  @SuppressWarnings("unused")
  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); } }

摘自网络，希望能帮助你！

答

[code="java"]package com.bruce.test.testcalendar;

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 */ @SuppressWarnings("static-access") 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;
  }
@SuppressWarnings("unused")
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 */ @SuppressWarnings("unused") 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);
  @SuppressWarnings("unused")
  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
  */
  @SuppressWarnings("unused")
  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); } } [/code] 摘自网络，希望能帮助你

答

[code="java"]
/**
* 获取指定日期所在周的周一
* @Methods Name getMonday
* @return Date
/
public Date getMonday(Date date){
Calendar cDay = Calendar.getInstance();

cDay.setTime(date);

cDay.set(Calendar.DAY_OF_WEEK, 2);//老外将周日定位第一天，周一取第二天
return cDay.getTime();

}
/*
* 获取指定日期所在周日
* @Methods Name getSunday
* @return Date
/
public Date getSunday(Date date){
Calendar cDay = Calendar.getInstance();

cDay.setTime(date);
if(Calendar.DAY_OF_WEEK==cDay.getFirstDayOfWeek()){ //如果刚好是周日，直接返回
return date;
}else{//如果不是周日，加一周计算
cDay.add(Calendar.DAY_OF_YEAR, 7);
cDay.set(Calendar.DAY_OF_WEEK, 1);
System.out.println(cDay.getTime());
return cDay.getTime();
}

}
/*
* 得到本月第一天的日期
* @Methods Name getFirstDayOfMonth
* @return Date
/
public Date getFirstDayOfMonth(Date date) {

Calendar cDay = Calendar.getInstance();

cDay.setTime(date);
cDay.set(Calendar.DAY_OF_MONTH, 1);
System.out.println(cDay.getTime());
return cDay.getTime();

}

/*
* 得到本月最后一天的日期
* @Methods Name getLastDayOfMonth
* @return Date
/
public Date getLastDayOfMonth(Date date) {

Calendar cDay = Calendar.getInstance();

cDay.setTime(date);
cDay.set(Calendar.DAY_OF_MONTH, cDay.getActualMaximum(Calendar.DAY_OF_MONTH));
System.out.println(cDay.getTime());
return cDay.getTime();

}
/*
* 得到本季度第一天的日期
* @Methods Name getFirstDayOfQuarter
* @return Date
/
public Date getFirstDayOfQuarter(Date date) {

Calendar cDay = Calendar.getInstance();

cDay.setTime(date);
int curMonth = cDay.get(Calendar.MONTH);
if (curMonth >= Calendar.JANUARY && curMonth <= Calendar.MARCH){

cDay.set(Calendar.MONTH, Calendar.JANUARY);
}
if (curMonth >= Calendar.APRIL && curMonth <= Calendar.JUNE){

cDay.set(Calendar.MONTH, Calendar.APRIL);
}
if (curMonth >= Calendar.JULY && curMonth <= Calendar.AUGUST) {

cDay.set(Calendar.MONTH, Calendar.JULY);
}
if (curMonth >= Calendar.OCTOBER && curMonth <= Calendar.DECEMBER) {

cDay.set(Calendar.MONTH, Calendar.OCTOBER);
}
cDay.set(Calendar.DAY_OF_MONTH, cDay.getActualMinimum(Calendar.DAY_OF_MONTH));
System.out.println(cDay.getTime());
return cDay.getTime();

}
/*
* 得到本季度最后一天的日期
* @Methods Name getLastDayOfQuarter
* @return Date
*/
public Date getLastDayOfQuarter(Date date) {

Calendar cDay = Calendar.getInstance();

cDay.setTime(date);
int curMonth = cDay.get(Calendar.MONTH);
if (curMonth >= Calendar.JANUARY && curMonth <= Calendar.MARCH){

cDay.set(Calendar.MONTH, Calendar.MARCH);
}
if (curMonth >= Calendar.APRIL && curMonth <= Calendar.JUNE){

cDay.set(Calendar.MONTH, Calendar.JUNE);
}
if (curMonth >= Calendar.JULY && curMonth <= Calendar.AUGUST) {

cDay.set(Calendar.MONTH, Calendar.AUGUST);
}
if (curMonth >= Calendar.OCTOBER && curMonth <= Calendar.DECEMBER) {

cDay.set(Calendar.MONTH, Calendar.DECEMBER);
}
cDay.set(Calendar.DAY_OF_MONTH, cDay.getActualMaximum(Calendar.DAY_OF_MONTH));
System.out.println(cDay.getTime());
return cDay.getTime();

}
[/code]

答

去看下 joda-time.jar 吧

java取当前周期、月初至月末、季度初至季度末日期。

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