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Computing accumulated precipitation per day


I have run a month-long simulation that produces hourly wrfout files. These files contain both RAINNC and I_RAINNC variables. How can I compute the accumulated precipitation for each day of the simulation?

Thanks for your help.
RAINC and RAINNC are accumulated convective and resolved-scale precipitation in WRF output.
Suppose you have hourly wrfout files, then daily rainfall can be derived from 00 UTC wrfout files at consecutive days, i.e.,
daily rain = (rainc +rainnc) (at 00UTC nday+1) - (rainc+rainnc) (at 00 UTC nday)