MySQL、java、js计算今日的起始时间和结束时间

mysql今日开始时间

(SELECT str_to_date(DATE_FORMAT(NOW(),'%Y-%m-%d'),'%Y-%m-%d %H:%i:%s'))

mysql今日结束时间

 (select DATE_ADD(DATE_ADD(str_to_date(DATE_FORMAT(NOW(),'%Y-%m-%d'),'%Y-%m-%d %H:%i:%s'),INTERVAL 1 DAY),INTERVAL -1 SECOND) )

java今日开始时间

public static Date getDayStart(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        return calendar.getTime();
}

java今日结束时间

public static Date getDayEnd(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        calendar.add(Calendar.DAY_OF_MONTH, 1);
        calendar.add(Calendar.MILLISECOND, -1);
        return calendar.getTime();
    }

js今日起始时间（使用momentjs）

moment().startOf('day')；

js今日结束时间

moment().endOf(String)