JavaScriptDateTimeConverter
using Newtonsoft.Json.Utilities;
using System;
using System.Globalization;
using System.Runtime.CompilerServices;
namespace Newtonsoft.Json.Converters
{
    [System.Runtime.CompilerServices.NullableContext(1)]
    [System.Runtime.CompilerServices.Nullable(0)]
    public class JavaScriptDateTimeConverter : DateTimeConverterBase
    {
        public override void WriteJson(JsonWriter writer, [System.Runtime.CompilerServices.Nullable(2)] object value, JsonSerializer serializer)
        {
            if (!(value is DateTime))
                throw new JsonSerializationException("Expected date object value.");
            long value2 = DateTimeUtils.ConvertDateTimeToJavaScriptTicks(((DateTime)value).ToUniversalTime());
            writer.WriteStartConstructor("Date");
            writer.WriteValue(value2);
            writer.WriteEndConstructor();
        }
        [return: System.Runtime.CompilerServices.Nullable(2)]
        public override object ReadJson(JsonReader reader, Type objectType, [System.Runtime.CompilerServices.Nullable(2)] object existingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Null) {
                if (!ReflectionUtils.IsNullable(objectType))
                    throw JsonSerializationException.Create(reader, "Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
                return null;
            }
            if (reader.TokenType != JsonToken.StartConstructor || !string.Equals(reader.Value?.ToString(), "Date", StringComparison.Ordinal))
                throw JsonSerializationException.Create(reader, "Unexpected token or value when parsing date. Token: {0}, Value: {1}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType, reader.Value));
            if (!JavaScriptUtils.TryGetDateFromConstructorJson(reader, out DateTime dateTime, out string errorMessage))
                throw JsonSerializationException.Create(reader, errorMessage);
            return dateTime;
        }
    }
}