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：

客官°小女子只卖身不卖艺 2022-05-17 00:38 343阅读 0赞

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;
        }
    }