One of my customers recently needed to change a date into text for contract wording.  That meant changing 9/1/2009 into  “this 1st day of September, 2009″.  Most of it was simple but the tricky part was adding the “ordinal suffix” (as in 1st, 2nd, 3rd, etc).  So I did a bit of playing around and came up with this:

WhileReadingRecords;
NumberVar DayIn := Day (PrintDate);
"This "
& Totext (DayIn , 0 )
& (if DayIn in 4 to 20 then 'th' else
if remainder (DayIn , 10) = 1 then 'st' else
if remainder (DayIn , 10) = 2 then 'nd' else
if remainder (DayIn , 10) = 3 then 'rd' else 'th')
& " day of "
& Totext (PrintDate , "MMMM, yyyy")

Note that there are several formulas that can do ordinal calculations for larger numbers, but this simple one works for dates, since day numbers are never bigger than 31.