java取当前周期、月初至月末、季度初至季度末日期。

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。。

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]

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！

[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

[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]

去看下 joda-time.jar 吧