As Doug says, this is not easy, but it can be done. Download the sample
document linked from
http://www.gmayor.com/insert_a_date_other_than_today.htm and modify the
field code changing DATE to Mergefield Datefieldname and the delay from 301
to 10.
The result will be something like
{QUOTE{SET Delay 10}{SET a{=INT((14-{MERGEFIELD FIELDNAME \@ M})/12)}}{SET
b{={MERGEFIELD FIELDNAME \@ yyyy}+4800-a}}{SET c{={MERGEFIELD FIELDNAME \@
M}+12*a-3}}{SET d{MERGEFIELD FIELDNAME \@ d}}{SET
jd{=d+INT((153*c+2)/5)+365*b+INT(b/4)-INT(b/100)+INT(b/400)-32045+Delay}}{SET
e{=INT((4*(jd+32044)+3)/146097)}}{SET f{=jd+32044-INT(146097*e/4)}}{SET
g{=INT((4*f+3)/1461)}}{SET h{=f-INT(1461*g/4)}}{SET
i{=INT((5*h+2)/153)}}{SET dd{=h-INT((153*i+2)/5)+1}}{SET
mm{=i+3-12*INT(i/10)}}{SET yy{=100*e+g-4800+INT(i/10)}}{=dd*10^6+mm*10^4+yy
\# "00'-'00'-'0000"} \@ "d MMMM yyyy"}
Credit to fellow MVP 'Macropod' for the work put into this.
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Graham Mayor - Word MVP
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