Mohhamed if I don't know the structure of Table1 I can't help You. May be something like this:

thisform.Grid1.RecordSource = NULL
SELECT * FROM TABLE1 WHERE mac1=thisform.text1.value .AND. Table1.nMonth == 1 ORDER BY Table1.nDay INTO CURSOR grdCursor READWRITE
mntLastDay = DATE(grdCursor.nYear, grdCursor.nMonth, 1)
mntLastDay = (GOMONTH(mntLastDay,1) - mntLastDay)
SELECT grdCursor
FOR nDay = grdCursor.nDay+1 TO mntLastDay
    INSERT INTO grdCursor (nDay) VALUES (nDay)
NEXT
thisform.Grid1.RecordSource = "grdCursor"
thisform.Grid1.Refresh()