首页 > 软件编程 > java > java Date类型时间计算

java基础篇之Date类型最常用的时间计算(相当全面)

2023-12-11 15:08:41 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

到此这篇关于java基础篇之Date类型最常用的时间计算的文章就介绍到这了,更多相关java Date类型时间计算内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！