SQL中的時間戳轉換成日期，計算天數差，進行比較

數據庫中存的時間戳，如何進行各種時間間隔計算，直接上SQL語句

select
      b.demandId
      from dj_api_designer_demandbid b
      left join dj_api_user_customizeddemand c on b.demandId = c.demandId
      where b.designerId = '37'
      and (b.bidWorksUrl = '' || b.bidWorksUrl = null)
      and FROM_UNIXTIME(unix_timestamp()) <![CDATA[ > ]]> DATE_ADD(FROM_UNIXTIME(c.bidEndDate), INTERVAL c.deliverDays DAY)
      and FROM_UNIXTIME(unix_timestamp()) <![CDATA[ < ]]> DATE_ADD(DATE_ADD(FROM_UNIXTIME(c.bidEndDate), INTERVAL c.deliverDays DAY), INTERVAL 7 DAY)

FROM_UNIXTIME：將MYSQL中以INT(11)存儲的時間以"YYYY-MM-DD"格式來顯示
DATE_ADD：向日期添加指定的時間間隔