Selecting Records Between Two Dates (should Work But It Doesn't)

Hello. I need to create a page with asp 3 and sql server 2000 that lists all the records in a table that match a date criterion, but when doing so I get an error "Error Converting datetime from character string"...
I've tried this versions of the query:


Code:

SELECT (...) CONVERT(DATETIME,PAYMENTS_RECEIVED.PYR_DATE,103), (...)
FROM RESERVES LEFT OUTER JOIN (...)
WHERE (PAYMENTS_RECEIVED.PYR_DATE BETWEEN '20/03/2006' AND '21/03/2006')



and...


Code:

SELECT (...) PAYMENTS_RECEIVED.PYR_DATE, (...)
FROM RESERVES LEFT OUTER JOIN (...)
WHERE (PAYMENTS_RECEIVED.PYR_DATE >= CONVERT(DATETIME,'20/03/2006',103)) AND (PAYMENTS_RECEIVED.PYR_DATE < CONVERT(DATETIME,'21/03/2006',103))



I also tried adding " 00:00:00 a.m." to the dates to be converted in the second piece of code. If I recall correctly, "103" is the convertion code meaning "dd/mm/yyyy". That is, I expect people to type in a date like "27/03/2006" and get the table records from that date.

Weirdest thing of all is that, when using the query builder of a sqlsource control in Visual Studio Web Developer Express 2005 this following query works just fine as I expect:


Code:

SELECT (...) PAYMENTS_RECEIVED.PYR_DATE, (...)
FROM RESERVES LEFT OUTER JOIN (...)
WHERE (PAYMENTS_RECEIVED.PYR_DATE >= CONVERT(DATETIME, '20/03/2006', 103)) AND (PAYMENTS_RECEIVED.PYR_DATE < CONVERT(DATETIME, ' 21 / 03 / 2006 ', 103))



Both the server and the DB are the same in all cases, but in the first two I run the query from a (working of other queries) vbscript asp 3 page.

I know that similar posts exist already (I've searched for this before posting), but I can't fix it, at least not with the usual answer on this one (that seems to be using the convert function as in the first piece of code). Thanks in advance!!!