Is there a better way in C# to round a DateTime to the nearest 5 seconds?

Question

I want to round a DateTime to the nearest 5 seconds. This is the way I\'m currently doing it but I was wondering if there was a better or more concise way?

Answer 1

How about this (blending a few answers together)? I think it conveys the meaning well and should handle the edge cases (rounding to the next minute) elegantly due to AddSeconds.

// truncate to multiple of 5
int second = 5 * (int) (now.Second / 5);
DateTime dt = new DateTime(..., second);

// round-up if necessary
if (now.Second % 5 > 2.5)
{
    dt = dt.AddSeconds(5);
}

The Ticks approach as shown by Jay is more concise, but may be a bit less readable. If you use that approach, at least reference TimeSpan.TicksPerSecond.