Uploading files with LFTP by date

Every day my web server generates a series of files with the following format:
AA-BB-YYYYMMDD.txt. For example: CA-FR-20101119.txt

The generated files are being stored in a directory. Until now, I synchronize it with the remote server using mput -c, uploading any files that have changed. However, the files in the remote server are moved once uploaded, so each day the script upload all the files back again.

I need to upload (syncronize) only the current day files, but for the date in the filename.

I am using the following script:

#!/bin/sh
USERNAME="username"
PASSWORD="password"
SERVER="10.10.10.10"

# local directory to pickup files
FILES="/var/www/html/CA-*.txt"

# remote server directory to upload files
UPLOADIR="/destination"

# login to remote server
lftp -u ${USERNAME},${PASSWORD} ${SERVER} << CMD
cd ${UPLOADIR}
mput -c ${FILES}
bye

Thank you very much for your help.