# Formula to create coupon on POS receipt

I have a pervasive database where the dates are stored in string like this 20101215

Dec 15 2012 = 20101215 which is my invoice date

I want to create a formula in crystal that will do this

If invoice date is between X and Y, then expiration date is Z

Z value is a hard coded date.

The formula is to create coupon on POS receipt
Ido Millet

stringvar ls_date := "20101215";
cDate(cdbl(ls_date[1 to 4]), cdbl(ls_date[5to 6]), cdbl(ls_date[7 to 8]));
That's not really "good" logic.  What will you do if the date is outside of that period?

My suggestion would be to use logic in your SELECT statement to bring in the expiration date along with the regular date.  Assuming that ExpiryDate is NULL if not within that range, then this should work:

SELECT InvoiceDate, IF(ExpiryDate >= X and ExpiryDate <= Y,Z,NULL) FROM ReceiptTable
Something like this... ( assume x and y are parameter fields; I have called them startdate and enddate)

Datevar dtdt;
dtdt:=cdate(Picture(totext({table.invoicedate},0,""), "xxxx/xx/xx"));
if dtdt in [{?startdate} to {?EndDate}] then
"30 June 2012"
else
""

@BillBach
You see I have not expiration date as a database field. I need to make up the expiration date based on the invoice date.

So I will have 4 expiration dates in one year (end of spring, summer, fall and winter).

If the invoice date is June the 1st 2013 (which is between March the 20th and June the 20th 2013) then the expiration date will be June the 20th 2013 (which is the last day of spring)

All I have is the invoice date as a database field. Does that make sense?