Newtonsoft.Json\Converters\JavaScriptDateTimeConverter.cs

using System;

using System.Globalization;

using Newtonsoft.Json.Utilities;

namespace Newtonsoft.Json.Converters

{

  /// <summary>

  /// Converts a <see cref="DateTime"/> to and from a JavaScript date constructor (e.g. new Date(52231943)).

  /// </summary>

  public class JavaScriptDateTimeConverter : DateTimeConverterBase

  {

    /// <summary>

    /// Writes the JSON representation of the object.

    /// </summary>

    /// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>

    /// <param name="value">The value.</param>

    /// <param name="serializer">The calling serializer.</param>

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

    {

      long ticks;

      if (value is DateTime)

      {

        DateTime dateTime = (DateTime)value;

        DateTime utcDateTime = dateTime.ToUniversalTime();

        ticks = JsonConvert.ConvertDateTimeToJavaScriptTicks(utcDateTime);

      }

#if !PocketPC && !NET20

      else if (value is DateTimeOffset)

      {

        DateTimeOffset dateTimeOffset = (DateTimeOffset)value;

        DateTimeOffset utcDateTimeOffset = dateTimeOffset.ToUniversalTime();

        ticks = JsonConvert.ConvertDateTimeToJavaScriptTicks(utcDateTimeOffset.UtcDateTime);

      }

#endif

      else

      {

        throw new Exception("Expected date object value.");

      }

      writer.WriteStartConstructor("Date");

      writer.WriteValue(ticks);

      writer.WriteEndConstructor();

    }

    /// <summary>

    /// Reads the JSON representation of the object.

    /// </summary>

    /// <param name="reader">The <see cref="JsonReader"/> to read from.</param>

    /// <param name="objectType">Type of the object.</param>

    /// <param name="existingValue">The existing property value of the JSON that is being converted.</param>

    /// <param name="serializer">The calling serializer.</param>

    /// <returns>The object value.</returns>

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

    {

      Type t = (ReflectionUtils.IsNullableType(objectType))

        ? Nullable.GetUnderlyingType(objectType)

        : objectType;

      if (reader.TokenType == JsonToken.Null)

      {

        if (!ReflectionUtils.IsNullableType(objectType))

          throw new Exception("Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));

        return null;

      }

      if (reader.TokenType != JsonToken.StartConstructor || string.Compare(reader.Value.ToString(), "Date", StringComparison.Ordinal) != 0)

        throw new Exception("Unexpected token or value when parsing date. Token: {0}, Value: {1}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType, reader.Value));

      reader.Read();

      if (reader.TokenType != JsonToken.Integer)

        throw new Exception("Unexpected token parsing date. Expected Integer, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));

      long ticks = (long)reader.Value;

      DateTime d = JsonConvert.ConvertJavaScriptTicksToDateTime(ticks);

      reader.Read();

      if (reader.TokenType != JsonToken.EndConstructor)

        throw new Exception("Unexpected token parsing date. Expected EndConstructor, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));

#if !PocketPC && !NET20

      if (t == typeof(DateTimeOffset))

        return new DateTimeOffset(d);

#endif

      return d;

    }

  }

}