ay standart 30 gün olarak hesaplanmıştır
SELECT TB_ZİMMET.SİCİL, TB_ZİMMET.[AD SOYAD], TB_ZİMMET.MALZEME, TB_ZİMMET.[MALZEME ADI], TB_ZİMMET.TARİH, DateDiff("d",[TARİH],Now())\ 30 & "/" & DateDiff("d",[TARİH],Now()) Mod 30 AS SÜRE
FROM TB_ZİMMET
ORDER BY TB_ZİMMET.TARİH DESC;