Joda

/** * 计算两个日期之间相差的天数 * * @author liuchao * @since 19/10/2017 */public static int daysBetween(Date startDate, Date endDate) {    Period period=new Period(startDate.getTime(),endDate.getTime(),PeriodType.days());    return period.getDays();
}
/** * 按照7天一个周期把一个时间段拆分成多个时间区间 * * @author mayanjun * @since 11/11/2017 */public static Collection<WeekSplit> splitWeek(Date beginDate, Date endDate) {    DateTime t1 = new DateTime(beginDate).withTime(0, 0, 0, 0);    DateTime t2 = new DateTime(endDate).withTime(0, 0, 0, 0);    Map<Integer, WeekSplit> splitMap = new HashMap<>();    for (DateTime ti = new DateTime(t1); ti.isBefore(t2) || ti.isEqual(t2); ti = ti.plusDays(1)) {        int week = ti.getWeekOfWeekyear();        WeekSplit split = splitMap.get(week);        if (split == null) {            split = new WeekSplit(week);            splitMap.put(week, split);        }        split.setDate(ti.toDate());    }    return splitMap.values();}/** * 封装开始日期和截止日期 * * @author mayanjun * @since 11/11/2017 */public static class WeekSplit {    Date beginDate;    Date endDate;    int weekOfYear;    public WeekSplit(int weekOfYear) {        this.weekOfYear = weekOfYear;    }    public void setDate(Date date) {        if (beginDate == null) {            beginDate = date;            endDate = date;        } else {            endDate = date;        }    }    public Date getBeginDate() {        return beginDate;    }    public void setBeginDate(Date beginDate) {        this.beginDate = beginDate;    }    public Date getEndDate() {        return endDate;    }    public void setEndDate(Date endDate) {        this.endDate = endDate;    }    public int getWeekOfYear() {        return weekOfYear;    }    public void setWeekOfYear(int weekOfYear) {        this.weekOfYear = weekOfYear;    }}