Mybatis,Mysql 筛选条件忽略是时分秒查询包含当天时间段

<if test=" startSignTime != null">
    and c.sign_time >= DATE_FORMAT(#{startSignTime},'%Y-%m-%d 00:00:00')
</if>
<if test=" endSignTime != null">
    and c.sign_time &lt;=  DATE_FORMAT(#{endSignTime},'%Y-%m-%d 23:59:59')
</if>