Script to check for certificate expiration

I have:

CERTEXPIRE=$(echo $line | awk -F 'expired on ''{print $2}')
    CERTEXPIREEPOCH=$(date --date="$CERTEXPIRE" +%s)
    CERTEXPIREDIFF=$(expr $CERTEXPIREEPOCH - $CURRENTTIMEEPOCH)

if (($CERTEXPIREDIFF < 2419200)); then
            BODY="\n\nIf it was not previously done, please create a Service Now Ticket for Systems team in order to renew the certificate.\n\nIgnore this
alarm if the certificate is /Common/ca-bundle.crt\n\nThis is an auto-generated e-mail from the BIG-IP."
            echo -e "$CERT expires on $CERTEXPIRE GMT.$BODY" | mail -s "WARNING: $CERT EXPIRES IN LESS THAN A MONTH!!" $MAIL -c $MAILCC
            echo "--> WARNING: $CERT EXPIRES IN LESS THAN A MONTH!!"
            NUMCRITICAL=$[$NUMCRITICAL +1]
    fi

I see it declared just fine. Is "$CERTEXPIRE GMT.$BODY"" correct ?