java中 获取天,周,月,年的开始时间和结束时间
java中 获取天,周,月,年的开始时间和结束时间
走世界 发表于9个月前
java中 获取天,周,月,年的开始时间和结束时间
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下方代码直接 怼上。。。。。。。。

package demoone;

 

import java.sql.Timestamp;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

import java.util.List;

 

public class DateUtils {

    //获取当天的开始时间

    public static java.util.Date getDayBegin() {

        Calendar cal = new GregorianCalendar();

        cal.set(Calendar.HOUR_OF_DAY, 0);

        cal.set(Calendar.MINUTE, 0);

        cal.set(Calendar.SECOND, 0);

        cal.set(Calendar.MILLISECOND, 0);

        return cal.getTime();

    }

    //获取当天的结束时间

    public static java.util.Date getDayEnd() {

        Calendar cal = new GregorianCalendar();

        cal.set(Calendar.HOUR_OF_DAY, 23);

        cal.set(Calendar.MINUTE, 59);

        cal.set(Calendar.SECOND, 59);

        return cal.getTime();

    }

    //获取昨天的开始时间

    public static Date getBeginDayOfYesterday() {

        Calendar cal = new GregorianCalendar();

        cal.setTime(getDayBegin());

        cal.add(Calendar.DAY_OF_MONTH, -1);

        return cal.getTime();

    }

    //获取昨天的结束时间

    public static Date getEndDayOfYesterDay() {

        Calendar cal = new GregorianCalendar();

        cal.setTime(getDayEnd());

        cal.add(Calendar.DAY_OF_MONTH, -1);

        return cal.getTime();

    }

  

 //获取明天的开始时间

    public static Date getBeginDayOfTomorrow() {

        Calendar cal = new GregorianCalendar();

        cal.setTime(getDayBegin());

        cal.add(Calendar.DAY_OF_MONTH, 1);

 

        return cal.getTime();

    }

    //获取明天的结束时间

    public static Date getEndDayOfTomorrow() {

        Calendar cal = new GregorianCalendar();

        cal.setTime(getDayEnd());

        cal.add(Calendar.DAY_OF_MONTH, 1);

        return cal.getTime();

    }

    //获取本周的开始时间

    public static Date getBeginDayOfWeek() {

        Date date = new Date();

        if (date == null) {

            return null;

        }

        Calendar cal = Calendar.getInstance();

        cal.setTime(date);

        int dayofweek = cal.get(Calendar.DAY_OF_WEEK);

        if (dayofweek == 1) {

            dayofweek += 7;

        }

        cal.add(Calendar.DATE, 2 - dayofweek);

        return getDayStartTime(cal.getTime());

    }

    //获取本周的结束时间

    public static Date getEndDayOfWeek(){

        Calendar cal = Calendar.getInstance();

        cal.setTime(getBeginDayOfWeek()); 

        cal.add(Calendar.DAY_OF_WEEK, 6);

        Date weekEndSta = cal.getTime();

        return getDayEndTime(weekEndSta);

    }

    //获取本月的开始时间

     public static Date getBeginDayOfMonth() {

            Calendar calendar = Calendar.getInstance();

            calendar.set(getNowYear(), getNowMonth() - 1, 1);

            return getDayStartTime(calendar.getTime());

        }

    //获取本月的结束时间

     public static Date getEndDayOfMonth() {

            Calendar calendar = Calendar.getInstance();

            calendar.set(getNowYear(), getNowMonth() - 1, 1);

            int day = calendar.getActualMaximum(5);

            calendar.set(getNowYear(), getNowMonth() - 1, day);

            return getDayEndTime(calendar.getTime());

        }

     //获取本年的开始时间

     public static java.util.Date getBeginDayOfYear() {

            Calendar cal = Calendar.getInstance();

            cal.set(Calendar.YEAR, getNowYear());

            // cal.set

            cal.set(Calendar.MONTH, Calendar.JANUARY);

            cal.set(Calendar.DATE, 1);

 

            return getDayStartTime(cal.getTime());

        }

     //获取本年的结束时间

     public static java.util.Date getEndDayOfYear() {

            Calendar cal = Calendar.getInstance();

            cal.set(Calendar.YEAR, getNowYear());

            cal.set(Calendar.MONTH, Calendar.DECEMBER);

            cal.set(Calendar.DATE, 31);

            return getDayEndTime(cal.getTime());

        }

    //获取某个日期的开始时间

    public static Timestamp getDayStartTime(Date d) {

        Calendar calendar = Calendar.getInstance();

        if(null != d) calendar.setTime(d);

        calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),    calendar.get(Calendar.DAY_OF_MONTH), 0, 0, 0);

        calendar.set(Calendar.MILLISECOND, 0);

        return new Timestamp(calendar.getTimeInMillis());

    }

    //获取某个日期的结束时间

    public static Timestamp getDayEndTime(Date d) {

        Calendar calendar = Calendar.getInstance();

        if(null != d) calendar.setTime(d);

        calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH),    calendar.get(Calendar.DAY_OF_MONTH), 23, 59, 59);

        calendar.set(Calendar.MILLISECOND, 999);

        return new Timestamp(calendar.getTimeInMillis());

    }

    //获取今年是哪一年

     public static Integer getNowYear() {

             Date date = new Date();

            GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();

            gc.setTime(date);

            return Integer.valueOf(gc.get(1));

        }

     //获取本月是哪一月

     public static int getNowMonth() {

             Date date = new Date();

            GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();

            gc.setTime(date);

            return gc.get(2) + 1;

        }

     //两个日期相减得到的天数

     public static int getDiffDays(Date beginDate, Date endDate) {

 

            if (beginDate == null || endDate == null) {

                throw new IllegalArgumentException("getDiffDays param is null!");

            }

 

            long diff = (endDate.getTime() - beginDate.getTime())

                    / (1000 * 60 * 60 * 24);

 

            int days = new Long(diff).intValue();

 

            return days;

        }

    //两个日期相减得到的毫秒数

     public static long dateDiff(Date beginDate, Date endDate) {

            long date1ms = beginDate.getTime();

            long date2ms = endDate.getTime();

            return date2ms - date1ms;

        }

     //获取两个日期中的最大日期

     public static Date max(Date beginDate, Date endDate) {

            if (beginDate == null) {

                return endDate;

            }

            if (endDate == null) {

                return beginDate;

            }

            if (beginDate.after(endDate)) {

                return beginDate;

            }

            return endDate;

        }

     //获取两个日期中的最小日期

     public static Date min(Date beginDate, Date endDate) {

            if (beginDate == null) {

                return endDate;

            }

            if (endDate == null) {

                return beginDate;

            }

            if (beginDate.after(endDate)) {

                return endDate;

            }

            return beginDate;

        }

     //返回某月该季度的第一个月

     public static Date getFirstSeasonDate(Date date) {

             final int[] SEASON = { 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4 };

            Calendar cal = Calendar.getInstance();

            cal.setTime(date);

            int sean = SEASON[cal.get(Calendar.MONTH)];

            cal.set(Calendar.MONTH, sean * 3 - 3);

            return cal.getTime();

        }

     //返回某个日期下几天的日期

     public static Date getNextDay(Date date, int i) {

            Calendar cal = new GregorianCalendar();

            cal.setTime(date);

            cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i);

            return cal.getTime();

        }

     //返回某个日期前几天的日期

     public static Date getFrontDay(Date date, int i) {

            Calendar cal = new GregorianCalendar();

            cal.setTime(date);

            cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i);

            return cal.getTime();

        }

     //获取某年某月到某年某月按天的切片日期集合(间隔天数的日期集合)

     public static List getTimeList(int beginYear, int beginMonth, int endYear,

                int endMonth, int k) {

            List list = new ArrayList();

            if (beginYear == endYear) {

                for (int j = beginMonth; j <= endMonth; j++) {

                    list.add(getTimeList(beginYear, j, k));

 

                }

            } else {

                {

                    for (int j = beginMonth; j < 12; j++) {

                        list.add(getTimeList(beginYear, j, k));

                    }

 

                    for (int i = beginYear + 1; i < endYear; i++) {

                        for (int j = 0; j < 12; j++) {

                            list.add(getTimeList(i, j, k));

                        }

                    }

                    for (int j = 0; j <= endMonth; j++) {

                        list.add(getTimeList(endYear, j, k));

                    }

                }

            }

            return list;

        }

     //获取某年某月按天切片日期集合(某个月间隔多少天的日期集合)

     public static List getTimeList(int beginYear, int beginMonth, int k) {

            List list = new ArrayList();

            Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1);

            int max = begincal.getActualMaximum(Calendar.DATE);

            for (int i = 1; i < max; i = i + k) {

                list.add(begincal.getTime());

                begincal.add(Calendar.DATE, k);

            }

            begincal = new GregorianCalendar(beginYear, beginMonth, max);

            list.add(begincal.getTime());

            return list;

        }

}

//获取某年某月的第一天日期

 public static Date getStartMonthDate(int year, int month) {

        Calendar calendar = Calendar.getInstance();

        calendar.set(year, month - 1, 1);

        return calendar.getTime();

    }

 

//获取某年某月的最后一天日期

   public static Date getEndMonthDate(int year, int month) {

        Calendar calendar = Calendar.getInstance();

        calendar.set(year, month - 1, 1);

        int day = calendar.getActualMaximum(5);

        calendar.set(year, month - 1, day);

        return calendar.getTime();

    }

 

 

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