Summarising Data

0

Hi

I am working with huge amounts of climate data. I have rainfall data recorded half hourly from 1 August 2017 to 9 October 2017 and I used a pivot table to obtain daily values (see attachment).
The daily totals are accumulated from 12 A.M. of one day to 12 A.M. of the following day which is fine. I would like to obtain daily totals accumulated from any other time interval which defines a 24-hour period other than 12 Am -12 AM e.g. 5 A.M. to 5 A.M. of the following day. I further want to obtain daily totals accumulated during day time only e.g. from 6 A.M. to 6 P.M. of the same day. My question is: how can I use excel to do that? 

Joseph

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