Java 日期工具类（今天、昨天、本周、上周、本月、上月、本年及特定时间的开始时间和结束时间）

• timestamp格式的部分

    /**
     * 获取当天的开始时间
     * @return Timestamp
     * @author LoveEmperor_王子様
     * date:   2019/8/15 15:50
     */
    public static Timestamp 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 new Timestamp(cal.getTimeInMillis());
    }
  
    /**
     * 获取当天的结束时间
     * @return Timestamp
     * @author LoveEmperor_王子様
     * date:   2019/8/15 15:49
     */
    public static Timestamp getDayEnd() {
        Calendar cal = new GregorianCalendar();
        cal.set(Calendar.HOUR_OF_DAY, 23);
        cal.set(Calendar.MINUTE, 59);
        cal.set(Calendar.SECOND, 59);
        return new Timestamp(cal.getTimeInMillis());
    }
  
    /**
     * 获取昨天的开始时间
     * @return Timestamp
     * @author LoveEmperor_王子様
     * date:   2019/8/15 15:57
     */
    public static Timestamp getBeginDayOfYesterday() {
        Calendar cal = new GregorianCalendar();
        cal.setTime(getDayBegin());
        cal.add(Calendar.DAY_OF_MONTH, -1);
        return new Timestamp(cal.getTimeInMillis());
    }
  
    /**
     * 获取昨天的结束时间
     * @return Timestamp
     * @author LoveEmperor_王子様
     * date:   2019/8/15 15:57
     */
    public static Timestamp getEndDayOfYesterday() {
        Calendar cal = new GregorianCalendar();
        cal.setTime(getDayEnd());
        cal.add(Calendar.DAY_OF_MONTH, -1);
        return new Timestamp(cal.getTimeInMillis());
    }
  
  

• 工具类代码

    import java.sql.Timestamp;
    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
         @SuppressWarnings("unused")
        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);
         }
         //获取上周的开始时间
         @SuppressWarnings("unused")
         public static Date getBeginDayOfLastWeek() {
             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 - 7);
             return getDayStartTime(cal.getTime());
         }
         //获取上周的结束时间
         public static Date getEndDayOfLastWeek(){
             Calendar cal = Calendar.getInstance();
             cal.setTime(getBeginDayOfLastWeek());
             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());
             }
          //获取上月的开始时间
          public static Date getBeginDayOfLastMonth() {
              Calendar calendar = Calendar.getInstance();
              calendar.set(getNowYear(), getNowMonth() - 2, 1);
              return getDayStartTime(calendar.getTime());
          }
          //获取上月的结束时间
          public static Date getEndDayOfLastMonth() {
              Calendar calendar = Calendar.getInstance();
              calendar.set(getNowYear(), getNowMonth() - 2, 1);
              int day = calendar.getActualMaximum(5);
              calendar.set(getNowYear(), getNowMonth() - 2, 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（间隔天数的集合）
          @SuppressWarnings({ "rawtypes", "unchecked" })
        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）
          @SuppressWarnings({ "unchecked", "rawtypes" })
        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;
             }
    }
  

• 调用

    import java.text.SimpleDateFormat;
  
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    
    String todayBegin = simpleDateFormat.format(DateUtils.getDayBegin());
    System.out.println(todayBegin );
    
    //输出结果为2017-10-26 00:00:00
  
  

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