I believe sando is suggesting that at the table level, your field is of Date/Time type. Is that correct? IF so, the suggestion is that you change the field type to text. I believe in a mail merge, Word imports text "As is". However, if you choose not to change your field type in your db, investigate "Field codes" in Word. I use them all the time, and they are pretty powerful.
For example, I have a curreny field in Access, Dues ($52,455) which imported into Word shows up like (52455). Prior to the merge, right click on the field in question, and choose field codes.
To clean up the example I gave you
1. Right Click on “Dues” Field.
2. Click “Toggle Field Code”
3. You will then see: {MERGEFIELD Dues}
4. Insert \# $#,##0.00 at the end of the merge field.
{MERGEFIELD Dues\# $#,##0.00}
5. Right Click "Toggle Field Code" to return.
After Mail merge, your field will be $52, 455.
With a little experimentation, you can to alot! Good luck.
vree