Calculating sums by time

Question

Hi. I need to know how can I calculate sum by date and time. I've got collection with date column, time column, value column and sums column with label in it . I tried in sumsColumn-label1 Text= Sum(Filter(Collection, dateColumn<=ThisItem!dateColumn),
TimeValue(timeColumn)<=TimeValue(ThisItem!timeColumn), valueColumn*1). This doesn't work. It works great with datum but not with time so if I have two values at same date it sums both values. I want that sums column calculate sum continuously by each value
so that's why I added time column. Please help. Thanks

Answer 1

Hi Ptr,
I believe you want to calculate a cumulative sum per Day. If I use your example, you start with 3 rows:
10 | 1/1/14
15 | 2/1/14
15 | 2/1/14
And you want to display the total sum in the gallery to see something like this:
(1st item in Gallery)       (2nd item in Gallery)          (3rd item in Gallery)
1/1/14                           2/1/14                             
2/1/14
10                                 25                                    40
One possible way to accomplish this is to add another a column to your original data called Index and make sure the first index is the oldest entry and the largest index is the most recent. Something like:
10 | 1/1/14  | 1 
15 | 2/1/14  | 2
15 | 2/1/14  | 3
Once you have this, you can then set the Text property expression of your label inside the Gallery to:
      Sum(Filter(Collection1, Index<=ThisItem!Index), Amount)
Alternatively, instead of creating an Index column, you create a new column that combines Date and Time together into a single column
DateTime. If you use Excel make sure to format all cells of this column to a Date type (e.g. 3/14/12 1:30PM). In Siena, the expression would then become:
      Sum(Filter(Collection1, DateTime<=ThisItem!DateTime), Amount)
Cheers,
Olivier