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On 2021/12/15 23:29, John Kaufmann wrote:
> On 2021-12-15 14:11, Hylton Conacher (ZR1HPC) wrote:
>> ...
>> I am quickly losing patience with a task that requires a sum of values that occur on the same date, but at different times.
>> My raw data sheet is in 4 columns [spaced for comprehension]
>>  Date/Time [stamp] | Value 1| Value Y| Value z
>> 2021-10-08 08:00:00|    5   |    7   |   0.15
>> 2021-10-08 14:05:16|    3   |   10   |   5
>> 2021-10-09 10:05:30|   15   |    3   |  25
>> 2021-10-09 18:00:00|   15   |    9   |   6
>> ...
>> ..
>> .
>> I have a secondary sheet with just the date i.e. 2010-10-08, acquired with formula `=LEFT($Data.A4,10)'. Column B of this sheet needs to be the SUM of all the numbers in the 3rd column, BUT only for the date in column A i.e.
>> 2010-10-08| 17
>> 2010-10-09| 12
>> ...
>> ..
>> .
> Just trying to understand your question properly, so for clarification:
> (1a) Your two sheets differ in column A, in that the first has a date/time stamp, the second date only (extracted from the first)?


> (1b) Does each row of the second sheet reflect the date of the corresponding row in the first sheet (in other words, dates are repeated on the second sheet, as suggested by your formula ($Data.A4, $Data.A5, $Data.A6, ...), or is each date on the second sheet listed just once?

No, the second sheet merely has a single entry per date. I basically used LEFT(1st sheet date/time column, 10) then manually typed the following date in the cell below, clicked on bottom right of cell and dragged down to current date.

> (2) We don't need to worry about columns B or D of the first sheet, just column C? [Any significance to columns B-C-D being indexed in three different formats (Numeric-UPPERCASE-lowercase)?]

Yes, do worry about columns B, D. I would like to do something similar to C, but figured I might try and bastardise the formula for C, for B +D.

> (3a) Did you try confirming that conjecture using a test example with just the date, not a date/time stamp?


> (3b) How is that date/time field acquired? Could it be acquired/input as two separate fields, date and time?
It is a combined field downloaded in a .csv file.


> (4) [This is related to questions 1 and 3] Given that you acquire the date for your second sheet's column A as a text field, is there a possible data type mismatch?
The date column in both sheets is formatted as a date column
 Sheet 1: yyyy-mm-dd hh:mm:ss
 Sheet 2: yyyy-mm-dd

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