Use an If...then...Else... construction
{ IF { MERGEFIELD Birthdate } = "12:00:00" "" { MERGEFIELD Birthdate } }
You must use Ctrl+F9 to insert each pair of field delimiters { } and Alt+F9
to toggle off their display

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Hope this helps.
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Doug Robbins - Word MVP
> When merging from Excel into Word 2002 the fields that are empty (a date
> field) comes over with 12:00:00 instead of blank. I am putting together a
> roster that shows birthdates. When the birthdate is unknown the field in
> Excel is empty. When it merges into word the field indicates the time
> instead
> of being blank. How can I insert this field without the time.