DateTime Round Up and Down

Question

Ive been looking for a proper rounding mechanism but nothing I find seems to be exactly what I need.

I need to round up and round down seperately and I also need to acco

Answer 1

This function will round up or down to the nearest interval (minutes).

    private static DateTime NormalizeReadingInterval(DateTime originalTime, int interval)
    {
        if (originalTime.Minute % interval == 0) return originalTime;
        var epochTime = new DateTime(1900, 1, 1);
        var minutes = (originalTime - epochTime).TotalMinutes;
        var numIntervals = minutes / interval;
        var roundedNumIntervals = Math.Round(numIntervals, 0);
        return epochTime.AddMinutes(roundedNumIntervals * interval);
    }