[Java知识库]jdk 1.8 获取本月开始时间和结束时间

    /**
     * 获取当月开始时间和结束时间
     * @return 起止时间
     */
    public static Date[] getMonthRangeDate()  {
        LocalDate today = LocalDate.now();
        //本月的第一天
        LocalDate firstDay = LocalDate.of(today.getYear(), today.getMonth(), 1);
        Date startTimeInMonth = Date.from(firstDay.atStartOfDay(ZoneOffset.ofHours(8)).toInstant());
        //本月的最后一天
        LocalDate lastDay = today.with(TemporalAdjusters.lastDayOfMonth());
        Date endTimeInMonth = Date.from(lastDay.atStartOfDay(ZoneOffset.ofHours(8)).toInstant());
        return new Date[]{getDayStartTime(startTimeInMonth),getDayEndTime(endTimeInMonth)};
    }




    /**
     * 获取某个日期的开始时间
     * @return 起止时间
     */
    public static Date 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 calendar.getTime();
    }
    /**
     * 获取某个日期的结束时间
     * @return 起止时间
     */
    public static Date 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 calendar.getTime();
    }

引用

java.time.LocalDate;

java.util.Date;

java.time.temporal.TemporalAdjusters;

java.time.ZoneOffset;

java.util.Calendar;