How do you compare DateTime objects using a specified tolerance in C#?

Question

By default C# compares DateTime objects to the 100ns tick. However, my database returns DateTime values to the nearest millisecond. What\'s the best way to compare two DateT

Answer 1

I’ve created extension methods IsSimilar

public static bool IsSimilar(this DateTime? lhs, DateTime? rhs, TimeSpan tolerance)
{
    if (!lhs.HasValue && !lhs.HasValue) return true;//both are null
    if (!lhs.HasValue || !lhs.HasValue) return false;//one of 2 is null
    return IsSimilar(lhs.Value, rhs.Value, tolerance);
}
public static bool IsSimilar(this DateTime lhs, DateTime rhs, TimeSpan tolerance)
{
    return (lhs - rhs).Duration() <= tolerance;
 }