Updating a date in table from Unbound txt box via List Box

[PenfoldCBUK]

This may sound like a noob question but i have a form with an unbound txt box, a list box (multi select) and a button. I want the date entered into the unbound txt box to be written to the selected records in the table on click of the button. Can anyone help, especially with the coding

 

[PenfoldCBUK]

I'm sorry i didnt explain myself properly. I have a Tbl called TblServices. I have designed a form consitsting of a list box, a text box and a button. I would like the list box to be multi select and write the date i put in the text box to the selected records on the press of the button. Is this posible???