Dear Professors

Field1 entitled date1, of table1, has following date type data

{25/02/2005}
{12/04/2005}
{22/05/2005}
{28/05/2005}
{05/06/2005}
{31/08/2005}

In text1 I enter date {25/05/2005}, This date is not in table.
Is it possible to findout TWO closet matching dates i.e

{22/05/2005} && closest smaller date
{28/05/2005} && closest bigger date

Please help