SQL语句查询错误

[kong佳]

SELECT workstatus.daterecived, workstatus.datereturned,
workstatus.datereturned - workstatus.daterecived - workrest.endtime - workrest.starttime
AS resttime
FROM workstatus INNER JOIN
workrest ON
workstatus.workerid = workrest.workid AND YEAR(workstatus.daterecived) = YEAR(workrest.starttime) AND MONTH(workstatus.daterecived)
= MONTH(workrest.starttime) AND DAY(workstatus.daterecived)
= DAY(workrest.starttime)
错误提示:将 expression 转换为数据类型 smalldatetime 时发生算术溢出错误。