Java获取一年里某季、某月、某周的第一天及最后一天时间的完整代码如下：

     //今天加一天
        private Date dateupdte(Date date){
            Calendar c = Calendar.getInstance();
            c.setTime(date);
            c.add(Calendar.DAY_OF_MONTH, 1);// 今天+1天
            Date tomorrow = c.getTime();
            return tomorrow;
        } 

/**
 * 返回指定日期的月的第一天
 *
 * @return
 */
public static Date getFirstDayOfMonth(Date date) {
    try {
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date dateNew = sdf.parse(sdf.format(date).substring(0, 10) + " " + "00:00:00");
        calendar.setTime(dateNew);
        calendar.set(calendar.get(Calendar.YEAR),
                calendar.get(Calendar.MONTH), 1);
        return calendar.getTime();
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return null;
}

/**
 * 返回指定日期的月的最后一天
 *
 * @return
 */
public static Date getLastDayOfMonth(Date date) {
    try {
        Calendar calendar = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date dateNew = sdf.parse(sdf.format(date).substring(0, 10) + " " + "23:59:59");
        calendar.setTime(dateNew);
        calendar.set(calendar.get(Calendar.YEAR),
                calendar.get(Calendar.MONTH), 1);
        calendar.roll(Calendar.DATE, -1);
        return calendar.getTime();
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return null;
}

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class DateUtil {

    /**
     * 得到某年某周的第一天
     *
     * @param year
     * @param week
     * @return
     */
    public static Date getFirstDayOfWeek(int year, int week) {
        week = week - 1;
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, Calendar.JANUARY);
        calendar.set(Calendar.DATE, 1);

        Calendar cal = (Calendar) calendar.clone();
        cal.add(Calendar.DATE, week * 7);

        return getFirstDayOfWeek(cal.getTime());
    }

    /**
     * 得到某年某周的最后一天
     *
     * @param year
     * @param week
     * @return
     */
    public static Date getLastDayOfWeek(int year, int week) {
        week = week - 1;
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, Calendar.JANUARY);
        calendar.set(Calendar.DATE, 1);
        Calendar cal = (Calendar) calendar.clone();
        cal.add(Calendar.DATE, week * 7);

        return getLastDayOfWeek(cal.getTime());
    }

    /**
     * 取得当前日期所在周的第一天
     *
     * @param date
     * @return
     */
    public static Date getFirstDayOfWeek(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setFirstDayOfWeek(Calendar.SUNDAY);
        calendar.setTime(date);
        calendar.set(Calendar.DAY_OF_WEEK,
                      calendar.getFirstDayOfWeek()); // Sunday
        return calendar.getTime();
    }

    /**
     * 取得当前日期所在周的最后一天
     *
     * @param date
     * @return
     */
    public static Date getLastDayOfWeek(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setFirstDayOfWeek(Calendar.SUNDAY);
        calendar.setTime(date);
        calendar.set(Calendar.DAY_OF_WEEK,
                     calendar.getFirstDayOfWeek() + 6); // Saturday
        return calendar.getTime();
    }

    /**
     * 取得当前日期所在周的前一周最后一天
     *
     * @param date
     * @return
     */
    public static Date getLastDayOfLastWeek(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return getLastDayOfWeek(calendar.get(Calendar.YEAR),
                                calendar.get(Calendar.WEEK_OF_YEAR) - 1);
    }

    /**
     * 返回指定日期的月的第一天
     *
     * @param year
     * @param month
     * @return
     */
    public static Date getFirstDayOfMonth(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(calendar.get(Calendar.YEAR),
                     calendar.get(Calendar.MONTH), 1);
        return calendar.getTime();
    }

    /**
     * 返回指定年月的月的第一天
     *
     * @param year
     * @param month
     * @return
     */
    public static Date getFirstDayOfMonth(Integer year, Integer month) {
        Calendar calendar = Calendar.getInstance();
        if (year == null) {
            year = calendar.get(Calendar.YEAR);
        }
        if (month == null) {
            month = calendar.get(Calendar.MONTH);
        }
        calendar.set(year, month, 1);
        return calendar.getTime();
    }

    /**
     * 返回指定日期的月的最后一天
     *
     * @param year
     * @param month
     * @return
     */
    public static Date getLastDayOfMonth(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(calendar.get(Calendar.YEAR),
                     calendar.get(Calendar.MONTH), 1);
        calendar.roll(Calendar.DATE, -1);
        return calendar.getTime();
    }

    /**
     * 返回指定年月的月的最后一天
     *
     * @param year
     * @param month
     * @return
     */
    public static Date getLastDayOfMonth(Integer year, Integer month) {
        Calendar calendar = Calendar.getInstance();
        if (year == null) {
            year = calendar.get(Calendar.YEAR);
        }
        if (month == null) {
            month = calendar.get(Calendar.MONTH);
        }
        calendar.set(year, month, 1);
        calendar.roll(Calendar.DATE, -1);
        return calendar.getTime();
    }

    /**
     * 返回指定日期的上个月的最后一天
     *
     * @param year
     * @param month
     * @return
     */
    public static Date getLastDayOfLastMonth(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(calendar.get(Calendar.YEAR),
                     calendar.get(Calendar.MONTH) - 1, 1);
        calendar.roll(Calendar.DATE, -1);
        return calendar.getTime();
    }

    /**
     * 返回指定日期的季的第一天
     *
     * @param year
     * @param quarter
     * @return
     */
    public static Date getFirstDayOfQuarter(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return getFirstDayOfQuarter(calendar.get(Calendar.YEAR),
                                    getQuarterOfYear(date));
    }

    /**
     * 返回指定年季的季的第一天
     *
     * @param year
     * @param quarter
     * @return
     */
    public static Date getFirstDayOfQuarter(Integer year, Integer quarter) {
        Calendar calendar = Calendar.getInstance();
        Integer month = new Integer(0);
        if (quarter == 1) {
            month = 1 - 1;
        } else if (quarter == 2) {
            month = 4 - 1;
        } else if (quarter == 3) {
            month = 7 - 1;
        } else if (quarter == 4) {
            month = 10 - 1;
        } else {
            month = calendar.get(Calendar.MONTH);
        }
        return getFirstDayOfMonth(year, month);
    }

    /**
     * 返回指定日期的季的最后一天
     *
     * @param year
     * @param quarter
     * @return
     */
    public static Date getLastDayOfQuarter(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return getLastDayOfQuarter(calendar.get(Calendar.YEAR),
                                   getQuarterOfYear(date));
    }

    /**
     * 返回指定年季的季的最后一天
     *
     * @param year
     * @param quarter
     * @return
     */
    public static Date getLastDayOfQuarter(Integer year, Integer quarter) {
        Calendar calendar = Calendar.getInstance();
        Integer month = new Integer(0);
        if (quarter == 1) {
            month = 3 - 1;
        } else if (quarter == 2) {
            month = 6 - 1;
        } else if (quarter == 3) {
            month = 9 - 1;
        } else if (quarter == 4) {
            month = 12 - 1;
        } else {
            month = calendar.get(Calendar.MONTH);
        }
        return getLastDayOfMonth(year, month);
    }

    /**
     * 返回指定日期的上一季的最后一天
     *
     * @param year
     * @param quarter
     * @return
     */
    public static Date getLastDayOfLastQuarter(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return getLastDayOfLastQuarter(calendar.get(Calendar.YEAR),
                                       getQuarterOfYear(date));
    }

    /**
     * 返回指定年季的上一季的最后一天
     *
     * @param year
     * @param quarter
     * @return
     */
    public static Date getLastDayOfLastQuarter(Integer year, Integer quarter) {
        Calendar calendar = Calendar.getInstance();
        Integer month = new Integer(0);
        if (quarter == 1) {
            month = 12 - 1;
        } else if (quarter == 2) {
            month = 3 - 1;
        } else if (quarter == 3) {
            month = 6 - 1;
        } else if (quarter == 4) {
            month = 9 - 1;
        } else {
            month = calendar.get(Calendar.MONTH);
        }
        return getLastDayOfMonth(year, month);
    }

    /**
     * 返回指定日期的季度
     *
     * @param date
     * @return
     */
    public static int getQuarterOfYear(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        return calendar.get(Calendar.MONTH) / 3 + 1;
    }
}