DateParsingPerformanceComparison

DateParsingPerformanceComparison.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

namespace ZeroAllocBenchmark
{
    [MemoryDiagnoser]
    public class DateParsingPerformanceComparison
    {
        private const string SampleDateString = "2024-03-13";

        [Benchmark]
        public void ParseDateUsingSubstringMethod()
        {
            int extractedYear = int.Parse(SampleDateString.Substring(0, 4));
            int extractedMonth = int.Parse(SampleDateString.Substring(5, 2));
            int extractedDay = int.Parse(SampleDateString.Substring(8, 2));
        }

        [Benchmark]
        public void ParseDateUsingReadOnlySpan()
        {
            ReadOnlySpan<char> dateAsReadOnlySpan = SampleDateString;
            int extractedYear = int.Parse(dateAsReadOnlySpan.Slice(0, 4));
            int extractedMonth = int.Parse(dateAsReadOnlySpan.Slice(5, 2));
            int extractedDay = int.Parse(dateAsReadOnlySpan.Slice(8, 2));
        }
    }

    class EntryPoint
    {
        static void Main(string[] args)
        {
            BenchmarkRunner.Run<DateParsingPerformanceComparison>();
        }
    }
}

Method	Mean	Error	StdDev	Gen0	Allocated
ParseDateUsingSubstringMethod	26.24 ns	0.290 ns	0.257 ns	0.0057	96 B
ParseDateUsingReadOnlySpan	18.78 ns	0.262 ns	0.245 ns	-	-