やっぱ UtcNow の方が速いんだ。的なやつ。

result.md

Method	Mean	Error	StdDev
DateTimeNowTicks	87.08 ns	1.0897 ns	1.0193 ns
DateTimeUtcNowTicks	68.06 ns	0.5209 ns	0.4617 ns
DateTimeOffsetNowTicks	114.62 ns	0.8232 ns	0.6874 ns
DateTimeOffsetUtcNowTicks	87.15 ns	0.2953 ns	0.2617 ns

TimeBenchmark.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;

public class TimeBenchmark
{
    [Benchmark]
    public long DateTimeNowTicks() => DateTime.Now.Ticks;
    [Benchmark]
    public long DateTimeUtcNowTicks() => DateTime.UtcNow.Ticks;
    [Benchmark]
    public long DateTimeOffsetNowTicks() => DateTimeOffset.Now.Ticks;
    [Benchmark]
    public long DateTimeOffsetUtcNowTicks() => DateTimeOffset.UtcNow.Ticks;
}

class Program
{
    static void Main()
    {
        BenchmarkRunner.Run<TimeBenchmark>();
    }
}