UUIDv7

A .NET Standard 2.0 library to create UUIDv7-style Guids.

Example:

namespace UUIDv7.Console;

using static System.Console;
using static Uuid7;

public static class Program
{
    public static void Main()
    {
        WriteLine(UnixEpoch);
        WriteLine(UnixEpochMax);
        for (int i = 0; i < 20; i++)
        {
            WriteLine(Create());
        }

        WriteLine();

        DateTimeOffset offset = DateTimeOffset.UtcNow;

        for (int i = 0; i < 20; i++)
        {
            WriteLine(Create(offset));
        }
    }
}

Benchmark Results

BenchmarkDotNet v0.15.8, Linux Ubuntu 24.04.4 LTS (Noble Numbat)
AMD EPYC 7763 2.62GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3
  DefaultJob : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v3

Method	PayloadLength	Mean	Error	StdDev
BenchmarkMethod	1000	660.4 μs	3.25 μs	2.88 μs
BenchmarkMethod	10000	6,798.6 μs	6.43 μs	5.70 μs
BenchmarkMethod	100000	65,599.2 μs	97.32 μs	86.27 μs
BenchmarkMethod	1000000	654,985.5 μs	752.81 μs	667.35 μs