Creating A Trace File With The Date Appended To It's Name

I'm trying to create a trace file with the file as part of it's name.
For example, I'd like to create a file called FailedLogins-20050428. So
far I haven't been able to figure out how to get the name of the file
and the date together (I'm sill very new to SQL Server and tracing).

What I've done is:
declare @rc int
declare @traceid int
declare @maxfilesize bigint
set @maxfilesize = 50
exec @rc=sp_trace_create @traceid=@traceid output, @options=0,
@tracefile=N'C: racefailedlogins', @maxfilesize=@maxfilesize,
@stoptime=NULL
if @rc > 0 print 'sp_trace_code failed with error code ' +
rtrim(cast(@rc as char))
else print 'traceid for the trace is ' + rtrim(cast(@traceid as char))

I can create a trace file on C drive without difficulty. I've tried
creating a file like this:
exec @rc=sp_trace_create @traceid=@traceid output, @options=0,
@tracefile=N'C: racefailedlogins + convert (varchar,getdate(),112',
@maxfilesize=@maxfilesize, @stoptime=NULL

But what I end up created is a file on C called
failedlogins + convert(varchar,getdate(),112).trc

I have no doubt what I want to do can be done. I just done know how to
do it.

If anyone could tell me where I'm going wrong, I'd really appreciate
it.

Thanks in advance.