1 #region License
2 // Copyright (c) 2007 James Newton-King
3 //
4 // Permission is hereby granted, free of charge, to any person
5 // obtaining a copy of this software and associated documentation
6 // files (the "Software"), to deal in the Software without
7 // restriction, including without limitation the rights to use,
8 // copy, modify, merge, publish, distribute, sublicense, and/or sell
9 // copies of the Software, and to permit persons to whom the
10 // Software is furnished to do so, subject to the following
11 // conditions:
12 //
13 // The above copyright notice and this permission notice shall be
14 // included in all copies or substantial portions of the Software.
15 //
16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
18 // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
20 // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 // OTHER DEALINGS IN THE SOFTWARE.
24 #endregion
25 
26 using System;
27 using System.Globalization;
28 using Newtonsoft.Json.Utilities;
29 
30 namespace Newtonsoft.Json.Converters
31 {
32     /// <summary>
33     /// Converts a <see cref="DateTime"/> to and from a JavaScript date constructor (e.g. new Date(52231943)).
34     /// </summary>
35     public class JavaScriptDateTimeConverter : DateTimeConverterBase
36     {
37         /// <summary>
38         /// Writes the JSON representation of the object.
39         /// </summary>
40         /// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
41         /// <param name="value">The value.</param>
42         /// <param name="serializer">The calling serializer.</param>
WriteJson(JsonWriter writer, object value, JsonSerializer serializer)43         public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
44         {
45             long ticks;
46 
47             if (value is DateTime)
48             {
49                 DateTime dateTime = (DateTime)value;
50                 DateTime utcDateTime = dateTime.ToUniversalTime();
51                 ticks = DateTimeUtils.ConvertDateTimeToJavaScriptTicks(utcDateTime);
52             }
53 #if !NET20
54             else if (value is DateTimeOffset)
55             {
56                 DateTimeOffset dateTimeOffset = (DateTimeOffset)value;
57                 DateTimeOffset utcDateTimeOffset = dateTimeOffset.ToUniversalTime();
58                 ticks = DateTimeUtils.ConvertDateTimeToJavaScriptTicks(utcDateTimeOffset.UtcDateTime);
59             }
60 #endif
61             else
62             {
63                 throw new JsonSerializationException("Expected date object value.");
64             }
65 
66             writer.WriteStartConstructor("Date");
67             writer.WriteValue(ticks);
68             writer.WriteEndConstructor();
69         }
70 
71         /// <summary>
72         /// Reads the JSON representation of the object.
73         /// </summary>
74         /// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
75         /// <param name="objectType">Type of the object.</param>
76         /// <param name="existingValue">The existing property value of the JSON that is being converted.</param>
77         /// <param name="serializer">The calling serializer.</param>
78         /// <returns>The object value.</returns>
ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)79         public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
80         {
81             if (reader.TokenType == JsonToken.Null)
82             {
83                 if (!ReflectionUtils.IsNullable(objectType))
84                 {
85                     throw JsonSerializationException.Create(reader, "Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
86                 }
87 
88                 return null;
89             }
90 
91             if (reader.TokenType != JsonToken.StartConstructor || !string.Equals(reader.Value.ToString(), "Date", StringComparison.Ordinal))
92             {
93                 throw JsonSerializationException.Create(reader, "Unexpected token or value when parsing date. Token: {0}, Value: {1}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType, reader.Value));
94             }
95 
96             reader.Read();
97 
98             if (reader.TokenType != JsonToken.Integer)
99             {
100                 throw JsonSerializationException.Create(reader, "Unexpected token parsing date. Expected Integer, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
101             }
102 
103             long ticks = (long)reader.Value;
104 
105             DateTime d = DateTimeUtils.ConvertJavaScriptTicksToDateTime(ticks);
106 
107             reader.Read();
108 
109             if (reader.TokenType != JsonToken.EndConstructor)
110             {
111                 throw JsonSerializationException.Create(reader, "Unexpected token parsing date. Expected EndConstructor, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
112             }
113 
114 #if !NET20
115             Type t = (ReflectionUtils.IsNullableType(objectType))
116                 ? Nullable.GetUnderlyingType(objectType)
117                 : objectType;
118             if (t == typeof(DateTimeOffset))
119             {
120                 return new DateTimeOffset(d);
121             }
122 #endif
123 
124             return d;
125         }
126     }
127 }