Change of time zone causes loss of data about wrtbwmon HOT 2 CLOSED

This is strange, the script itself does not perform any calculations with 
dates. They
are just used for presentation in the report.
What may occur is that /tmp gets cleared as the timezone setting is on dd-wrt's 
main
setup page and applying settings there basically reboots the router. Please 
check if
that is what is happening - if so there might be issues restoring the data 
after a
reboot.