Bash question

[jenea]

This is my script:
=================================================================
#!/bin/bash
today_day=$(echo `date +"'%e %b %Y'"`)

echo $today_day

tar -cvz --newer $today_day -f /mnt/usb_backup/backup/diff/backupFull_`date
+%Y%m%d`.tgz /mnt/mirror80gb/Shared_Folder/



This is the debug:
=================================================================
filer:/mnt/usb_backup/backup/test# bash -x ./jenea
+++ date '+'\''%e %b %Y'\'''
++ echo ''\''25' Mar '2009'\'''
+ today_day=''\''25 Mar 2009'\'''
+ echo ''\''25' Mar '2009'\'''
'25 Mar 2009'
++ date +%Y%m%d
+ tar -cvz --newer ''\''25' Mar '2009'\''' -f
/mnt/usb_backup/backup/diff/backupFull_20090325.tgz
/mnt/mirror80gb/Shared_Folder/
tar: Failed to open '/dev/sa0': Operation not supported
filer:/mnt/usb_backup/backup/test# 


The problem is that the tar command would run only in the following syntax
(see date part):
=================================================================
tar -cvz --newer '22 Mar 2009' -f
/mnt/usb_backup/backup/diff/backupFull_`date +%Y%m%d`.tgz /mnt/mirror80gb/


My question is: How can i pass the variable's content into the tar line so
in the end it looks like this --- >  '22 Mar 2009' 


Thank you.
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