IGFAE_MSWord_office_script.txt

Superscript, too, is possible! You can use a field coded as:
{QUOTE{SET MergeDate {MERGEFIELD Date}}
{MergeDate \@ "dddd 'the' d"}
{IF{=(MOD({={MergeDate \@ d}+89},100)>2)*(MOD({={MergeDate \@ d}+9},10)<3)}= 1 {=MOD({MergeDate \@ d},10)-2 \# rd;st;nd} th}
{MergeDate \@ "' of' MMMM, yyyy"}
} 

IF Expression1 Operator Expression2 TrueText FalseText
IF {MergeDate @\ d} 

{IF{=(MOD({={MergeDate \@ d}+89},100)>2)*(MOD({={MergeDate \@ d}+9},10)<3)}= 1 {=MOD({MergeDate \@ d},10)-2 \# rd;st;nd} th}