How to find the time that a max value occurs?

Hi,

I have a spreadsheet that has data taken for every 10 minutes throughout the day for close to a year. Im having trouble trying to find the time that the max value occurs in my data for each day.
Ive got a column with the times that the data is recorded, a column that has just the date (in number format), a column of the data and a column that finds the max value for that particular day using the following formula:

=IF(B2<>B3,MAX(($B$2:$B$1048576=B2)*($C$2:$C$1048576)),"")

Ive tried using the formula below to find the time of day, however there are a number of duplicates on different days in the data so it only returns the earliest date that it finds.

=IF(B2<>B3,INDEX(A:A,(MATCH(E2,C:C,0))),"")

Can anyone please help me with a formula to find the time the max value occurs each day. I have attached a spreadsheet that is similar to the one I'm working on which may help.

Thanks