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java基础篇之Date类型最常用的时间计算(相当全面)

作者:pingzhuyan

这篇文章主要给大家介绍了关于java基础篇之Date类型最常用的时间计算的相关资料,Java中的Date类是用来表示日期和时间的类,它提供了一些常用的方法来处理日期和时间的操作,需要的朋友可以参考下

1. 前言: 

平常开发中 总会有一些时间计算, 每次都去写 不仅代码很冗余 也是浪费时间的

这里呢 封装了最最常用的n中写法

持续更新 现在更新到43个了, 用哪个 全局搜索 复制即可

(ps: 最好对着目录看一下 不然不太好找)

2. 具体方法实现

2.1 获取当天的开始时间

 public static 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();
    }

2.2 获取当天的结束时间

public static 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();

    }

2.3 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();
    }

2.4 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();

    }

2.5 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();

    }

2.6 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();

    }

2.7 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());

    }

2.8 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);
    }

2.9 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());
    }

2.10 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());
    }

2.11 获取上个月的开始时间

 public static Date getBeginDayOfLastMonth(int n) {
        Date date = new Date();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(calendar.MONTH, -n);
        calendar.set(calendar.DAY_OF_MONTH, 1);
        return getDayStartTime(calendar.getTime());
    }

2.12 获取上个月的结束时间

  public static Date getEndDayOfLastMonth(int n) {
        Date date = new Date();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(calendar.MONTH, -n);
        int day = calendar.getActualMaximum(5);
        calendar.set(calendar.DAY_OF_MONTH, day);
        return getDayEndTime(calendar.getTime());
    }

2.13 获取本年的开始时间

public static Date getBeginDayOfYear() {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, getNowYear());
        cal.set(Calendar.MONTH, Calendar.JANUARY);
        cal.set(Calendar.DATE, 1);
        return getDayStartTime(cal.getTime());
    }

2.14 获取n年前的开始时间

    public static Date getBeginDayOfLastYear(int n) {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, getNowYear() - n);
        cal.set(Calendar.MONTH, Calendar.JANUARY);
        cal.set(Calendar.DATE, 1);
        return getDayStartTime(cal.getTime());
    }

2.15 获取n年前的结束时间

    public static Date getEndDayOfLastYear(int n) {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, getNowYear() - n);
        cal.set(Calendar.MONTH, Calendar.DECEMBER);
        cal.set(Calendar.DATE, 31);
        return getDayEndTime(cal.getTime());
    }

2.16 获取本年的结束时间

    public static 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());
    }

2.17 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());
    }

2.18 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());
    }

2.19 获取今年是哪一年

    // 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 gc.get(Calendar.YEAR);
    }

2.20 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(Calendar.MONTH) + 1;
    }

2.21 时间差值计算校验(开始与结束时间不可为空)

    public static void dateMarginCheck(Date beginDate, Date endDate) {
        if (beginDate == null || endDate == null) {
            throw new IllegalArgumentException("getDiffDays param is null!");
        }
    }

2.22 日期相减得到的天数(不足一天为1 超时为-1)

 public static int getExactDiffDays(Date beginDate, Date endDate) {
        dateMarginCheck(beginDate, endDate);
        BigDecimal subtract = new BigDecimal(endDate.getTime()).subtract(new BigDecimal(beginDate.getTime()));
        BigDecimal divide = subtract.divide(new BigDecimal(1000 * 60 * 60 * 24), RoundingMode.UP);
        return divide.intValue();
    }

2.23 两个日期相减得到的天数[不精确]

  // 两个日期相减得到的天数
    public static int getDiffDays(Date beginDate, Date endDate) {

        dateMarginCheck(beginDate, endDate);
        long diff = (endDate.getTime() - beginDate.getTime() - 1000) / (1000 * 60 * 60 * 24);

        return new Long(diff).intValue();
    }

2.24 两个日期相减得到的小时

    public static int getDiffHours(Date beginDate, Date endDate) {
        dateMarginCheck(beginDate, endDate);
        long diff = (endDate.getTime() - beginDate.getTime()) / (1000 * 60 * 60);
        return new Long(diff).intValue();
    }

2.25 两个日期相减得到的毫秒数

    public static long dateDiff(Date beginDate, Date endDate) {
        //开始时间或结束时间为空 返回0L 毫秒
        if (beginDate == null || endDate == null) {
            return 0L;
        }

        long date1ms = beginDate.getTime();
        long date2ms = endDate.getTime();
        return date2ms - date1ms;
    }

2.26 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;
    }

2.27 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;
    }

2.28 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();
    }

2.29 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();
    }

2.30 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();
    }

2.31 获取某年某月到某年某月按天的切片日期集合

 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;
    }

2.32 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;
    }

2.33 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, 0, 0, 0);
        return calendar.getTime();
    }

2.34 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, 23, 59, 59);
        return calendar.getTime();
    }

2.35 年月日转化成 -> 年月日 时分秒

change( 2023-06-23 ) to ( 2023-06-23 23:59:59 )
  public static Date getDateDetail(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.HOUR, 23);//时
        calendar.add(Calendar.MINUTE, 59);//时
        calendar.add(Calendar.SECOND, 59);//秒

        return calendar.getTime();
    }

2.36 年月日自定义转化成 -> 年月日 时分秒

change( 2023-06-23 ) to ( 2023-06-23 ?:?:? )

    public static Date getDateDetail(Date date, Integer hour, Integer minute, Integer second) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.HOUR, hour);//时
        calendar.add(Calendar.MINUTE, minute);//时
        calendar.add(Calendar.SECOND, second);//秒

        return calendar.getTime();
    }

2.37 date2比date1多的天数

public static int differentDays(Date date1, Date date2) {
        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(date1);

        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(date2);

        int day1 = cal1.get(Calendar.DAY_OF_YEAR);
        int day2 = cal2.get(Calendar.DAY_OF_YEAR);
        int year1 = cal1.get(Calendar.YEAR);
        int year2 = cal2.get(Calendar.YEAR);

        if (year1 != year2) //同一年

        {
            int timeDistance = 0;
            for (int i = year1; i < year2; i++) {
                if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) //闰年
                {
                    timeDistance += 366;
                } else //不是闰年
                {
                    timeDistance += 365;
                }
            }

            return timeDistance + (day2 - day1);

        } else { //不同年
            return day2 - day1;
        }
    }

2.38 秒数(s) 转天时分秒 或 时分秒

 public static String toDayHoursMinSec(Long time) {
        long day = TimeUnit.SECONDS.toDays(time);
        long hours = TimeUnit.SECONDS.toHours(time) - TimeUnit.DAYS.toHours(TimeUnit.SECONDS.toDays(time));
        long minutes = TimeUnit.SECONDS.toMinutes(time) - TimeUnit.HOURS.toMinutes(TimeUnit.SECONDS.toHours(time));
        long seconds = TimeUnit.SECONDS.toSeconds(time) - TimeUnit.MINUTES.toSeconds(TimeUnit.SECONDS.toMinutes(time));
        if (day > 0) {
            return String.format("%s天%s时%s分%s秒", day, hours, minutes, seconds);
        }
        return String.format("%s时%s分%s秒", hours, minutes, seconds);
    }

2.39 毫秒数(ms) 转天时分秒 或 时分秒

    public static String toDayHoursMinMilliSec(Long time) {
        long day = TimeUnit.MILLISECONDS.toDays(time);
        long hours = TimeUnit.MILLISECONDS.toHours(time) - TimeUnit.DAYS.toHours(TimeUnit.MILLISECONDS.toDays(time));
        long minutes = TimeUnit.MILLISECONDS.toMinutes(time) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(time));
        long seconds = TimeUnit.MILLISECONDS.toSeconds(time) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(time));
        if (day > 0) {
            return String.format("%s天%s时%s分%s秒", day, hours, minutes, seconds);
        }
        return String.format("%s时%s分%s秒", hours, minutes, seconds);
    }

2.40 获取当前时间[精准]

与new Date(有区别)

    public static Date getNowDate() {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
    }

2.41 时间字符串转换date

    public static Date getStrToDate(String dateStr) throws ParseException {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return format.parse(dateStr);
    }

2.42 获取到?天后的Date类型时间

    public static Date getAfterDayEnd(Date startTime, int days) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(startTime);
        cal.add(Calendar.DAY_OF_MONTH, days);//跟随月份走的天数<构造器中写了每个月的天数...>
        return cal.getTime();
    }

2.43 n小时后的时间

    public static Date getAfterHourEnd(Date startTime, int hours) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(startTime);
        cal.add(Calendar.HOUR_OF_DAY, hours);//24小时制度
        return cal.getTime();
    }

总结 

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