mysql根据时间查询记录返回结果中始终缺少当天的数据?

select o.* from user o where 1=1  and userId = 100041 and  createTime between '2016-05-04' and  '2016-05-06'  order by o.createTime desc 

始终缺少当天比如六号那天的记录,该怎么办?

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