Hours Totalizer substitution.

I need to substitute the dataset

timeEq('SEN0__6GR_0S014','6-OCT-06','*',"Attiva")/3600

with another that updates the values only every 12h is it possibile?

Is it possibile to create a tag that summarize the time and update their values every midnight to make faster theh load of the synoptics?

Thanks in advance for any help.