LINQ aggregate and group by periods of time

Question

I\'m trying to understand how LINQ can be used to group data by intervals of time; and then ideally aggregate each group.

Finding numerous examples with explicit dat

Answer 1

Even though I am really late, here are my 2 cents:

I wanted to Round() the time values down AND up in 5 minute intervals:

10:31 --> 10:30
10:33 --> 10:35
10:36 --> 10:35

This can be achieved by converting to TimeSpan.Tick and converting back to DateTime and using Math.Round():

public DateTime GetShiftedTimeStamp(DateTime timeStamp, int minutes)
{
    return
        new DateTime(
            Convert.ToInt64(
                Math.Round(timeStamp.Ticks / (decimal)TimeSpan.FromMinutes(minutes).Ticks, 0, MidpointRounding.AwayFromZero)
                    * TimeSpan.FromMinutes(minutes).Ticks));
}

The shiftedTimeStamp can be used in linq grouping as shown above.