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

How about:

case RoundingDirection.Up:
    t = dt.AddMinutes((60 - dt.Minute) % 10);
case RoundingDirection.Down:
    t = dt.AddMinutes(-dt.Minute % 10);

Demo: http://ideone.com/AlB7Q