crontab and command expansion problem

[Isaac Claymore <clay@exavio.com.cn>]

Hi folks, 

I'm using a Debian unstable, and just moved a crontab like this from another
Redhat-based system:

WEEK_DAY=`date +\%A`
30 23 * * * mount /backup && mysqldump --password=FOOBAR --all-databases > /backup/alldb-${WEEK_DAY}.sql; umount /backup

It's been working on RH system, but the Debian cron keeps refusing to do command
expansion on WEEK_DAY, i.e. the script produces a file named: alldb-`date +\%A`.sql

Any hint?

Thanks in advance.


PS: plz kindly CC me.

-- 

Regards, Isaac
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