backticks not working in client-local.cfg

Xymon version: - Xymon 4.3.10
OS: - Ubuntu 12.04 LTS

**I am using the below entry but it is not converting the date command to
the value.

[server-name]
log:/mnt/logs/access.`date +%Y-%m-%d`.log:10240
ignore INFO
trigger SEVERE

I tried many things but no luck, on the log page I see the date command as
it is instead of the actual date value.: -

log:`/mnt/logs/access.`date +%Y-%m-%d`.log`:10240
log:$(/mnt/logs/access.`date +%Y-%m-%d`.log):10240
log:$(echo /mnt/logs/access.`date +%Y-%m-%d`.log):10240
log:/mnt/logs/access.$(date +%Y-%m-%d).log:10240