ISO date to numeric in SQL

Just a quick SQL question.  I found lots of way to convert numeric to real 
dates, but nothing for date to numeric on searching the archives.
Here is what I did:

YYMMDD = MOD(YEAR(ISODATE),100)*10000+MONTH(ISODATE)*100+DAY(ISODATE)

I also had some "0001-01-01" to zero handling.  It worked okay, but I 
didn't have many records, and it was ugly to read.  Is there a more 
efficient/cleaner method for doing this?  I know I could build a UDF, but 
for one I've never done so, and for another that might rock the "shop 
standards" boat a bit, which isn't necessarily worth it yet for the amount 
of pure SQL that we use.

TIA,
Adam

#####################################################################################
Attention:
The above message and/or attachment(s) is private and confidential and is 
intended 
only for the people for which it is addressed. If you are not named in the 
address 
fields, ignore the contents and delete all the material. Thank you. Have a nice 
day.

For more information on email virus scanning, security and content
management, please contact administrator@xxxxxxxxxxxx
#####################################################################################