DateHeaderParser.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.Net.Http.Headers;
 
internal sealed class DateHeaderParser : HttpHeaderParser
{
    internal static readonly DateHeaderParser Parser = new DateHeaderParser();
 
    private DateHeaderParser()
        : base(supportsMultipleValues: false)
    {
    }
 
    public override string ToString(object value)
    {
        return HttpDateParser.DateToString((DateTimeOffset)value);
    }
 
    public override bool TryParseValue([NotNullWhen(true)] string value, object storeValue, ref int index, [NotNullWhen(true)] out object parsedValue)
    {
        parsedValue = null;
        if (string.IsNullOrEmpty(value) || index == value.Length)
        {
            return false;
        }
        ReadOnlySpan<char> input = value;
        if (index > 0)
        {
            input = value.AsSpan(index);
        }
        if (!HttpDateParser.TryParse(input, out var result))
        {
            return false;
        }
        index = value.Length;
        parsedValue = result;
        return true;
    }
}