Download Traffic per day with counter-reset

Hi guys,

i have a counter “TotalBytesReceived” from my router.
At about 3am every night there is a reset of the counter.
I would like to have a “stat” panel showing the traffic of today so far (from 0:00am to actual time; NOT of the last 24 hours!!!).
How can this be done?

greetz
duffy6